Added initramfs configuration for automatic mode

[aula.git] / server / etc / squid3 / squid.conf.BCK_20120208_1145

#       WELCOME TO SQUID 3.1.6
#       ----------------------------
#
#       This is the default Squid configuration file. You may wish
#       to look at the Squid home page (http://www.squid-cache.org/)
#       for the FAQ and other documentation.
#
#       The default Squid config file shows what the defaults for
#       various options happen to be.  If you don't need to change the
#       default, you shouldn't uncomment the line.  Doing so may cause
#       run-time problems.  In some cases "none" refers to no default
#       setting at all, while in other cases it refers to a valid
#       option - the comments for that keyword indicate if this is the
#       case.
#

# =( Red Educativa del Principado de Asturias )==========================
#  If you need to modify this file, change it at /etc/templates/
#  Otherwise your changes will be overwritten when the system is started
# =======================================================================

#  Configuration options can be included using the "include" directive.
#  Include takes a list of files to include. Quoting and wildcards is
#  supported.
#
#  For example,
#
#  include /path/to/included/file/squid.acl.config
#
#  Includes can be nested up to a hard-coded depth of 16 levels.
#  This arbitrary restriction is to prevent recursive include references
#  from causing Squid entering an infinite loop whilst trying to load
#  configuration files.

# OPTIONS FOR AUTHENTICATION
# -----------------------------------------------------------------------------

#  TAG: auth_param
#       This is used to define parameters for the various authentication
#       schemes supported by Squid.
#
#       format: auth_param scheme parameter [setting]
#
#       The order in which authentication schemes are presented to the client is
#       dependent on the order the scheme first appears in config file. IE
#       has a bug (it's not RFC 2617 compliant) in that it will use the basic
#       scheme if basic is the first entry presented, even if more secure
#       schemes are presented. For now use the order in the recommended
#       settings section below. If other browsers have difficulties (don't
#       recognize the schemes offered even if you are using basic) either
#       put basic first, or disable the other schemes (by commenting out their
#       program entry).
#
#       Once an authentication scheme is fully configured, it can only be
#       shutdown by shutting squid down and restarting. Changes can be made on
#       the fly and activated with a reconfigure. I.E. You can change to a
#       different helper, but not unconfigure the helper completely.
#
#       Please note that while this directive defines how Squid processes
#       authentication it does not automatically activate authentication.
#       To use authentication you must in addition make use of ACLs based
#       on login name in http_access (proxy_auth, proxy_auth_regex or
#       external with %LOGIN used in the format tag). The browser will be
#       challenged for authentication on the first such acl encountered
#       in http_access processing and will also be re-challenged for new
#       login credentials if the request is being denied by a proxy_auth
#       type acl.
#
#       WARNING: authentication can't be used in a transparently intercepting
#       proxy as the client then thinks it is talking to an origin server and
#       not the proxy. This is a limitation of bending the TCP/IP protocol to
#       transparently intercepting port 80, not a limitation in Squid.
#       Ports flagged 'transparent', 'intercept', or 'tproxy' have
#       authentication disabled.
#
#       === Parameters for the basic scheme follow. ===
#
#       "program" cmdline
#       Specify the command for the external authenticator.  Such a program
#       reads a line containing "username password" and replies "OK" or
#       "ERR" in an endless loop. "ERR" responses may optionally be followed
#       by a error description available as %m in the returned error page.
#       If you use an authenticator, make sure you have 1 acl of type
#       proxy_auth.
#
#       By default, the basic authentication scheme is not used unless a
#       program is specified.
#
#       If you want to use the traditional NCSA proxy authentication, set
#       this line to something like
#
#       auth_param basic program /usr/lib/squid3/ncsa_auth /usr/etc/passwd
#
#       "utf8" on|off
#       HTTP uses iso-latin-1 as characterset, while some authentication
#       backends such as LDAP expects UTF-8. If this is set to on Squid will
#       translate the HTTP iso-latin-1 charset to UTF-8 before sending the
#       username & password to the helper.
#
#       "children" numberofchildren
#       The number of authenticator processes to spawn. If you start too few
#       Squid will have to wait for them to process a backlog of credential
#       verifications, slowing it down. When password verifications are
#       done via a (slow) network you are likely to need lots of
#       authenticator processes.
#       auth_param basic children 5
#
#       "concurrency" concurrency
#       The number of concurrent requests the helper can process.
#       The default of 0 is used for helpers who only supports
#       one request at a time. Setting this changes the protocol used to
#       include a channel number first on the request/response line, allowing
#       multiple requests to be sent to the same helper in parallell without
#       wating for the response.
#       Must not be set unless it's known the helper supports this.
#       auth_param basic concurrency 0
#
#       "realm" realmstring
#       Specifies the realm name which is to be reported to the
#       client for the basic proxy authentication scheme (part of
#       the text the user will see when prompted their username and
#       password). There is no default.
#       auth_param basic realm Squid proxy-caching web server
#
#       "credentialsttl" timetolive
#       Specifies how long squid assumes an externally validated
#       username:password pair is valid for - in other words how
#       often the helper program is called for that user. Set this
#       low to force revalidation with short lived passwords.  Note
#       setting this high does not impact your susceptibility
#       to replay attacks unless you are using an one-time password
#       system (such as SecureID).  If you are using such a system,
#       you will be vulnerable to replay attacks unless you also
#       use the max_user_ip ACL in an http_access rule.
#
#       "casesensitive" on|off
#       Specifies if usernames are case sensitive. Most user databases are
#       case insensitive allowing the same username to be spelled using both
#       lower and upper case letters, but some are case sensitive. This
#       makes a big difference for user_max_ip ACL processing and similar.
#       auth_param basic casesensitive off
#
#       === Parameters for the digest scheme follow ===
#
#       "program" cmdline
#       Specify the command for the external authenticator.  Such
#       a program reads a line containing "username":"realm" and
#       replies with the appropriate H(A1) value hex encoded or
#       ERR if the user (or his H(A1) hash) does not exists.
#       See rfc 2616 for the definition of H(A1).
#       "ERR" responses may optionally be followed by a error description
#       available as %m in the returned error page.
#
#       By default, the digest authentication scheme is not used unless a
#       program is specified.
#
#       If you want to use a digest authenticator, set this line to
#       something like
#
#       auth_param digest program /usr/lib/squid3/digest_pw_auth /usr/etc/digpass
#
#       "utf8" on|off
#       HTTP uses iso-latin-1 as characterset, while some authentication
#       backends such as LDAP expects UTF-8. If this is set to on Squid will
#       translate the HTTP iso-latin-1 charset to UTF-8 before sending the
#       username & password to the helper.
#
#       "children" numberofchildren
#       The number of authenticator processes to spawn (no default).
#       If you start too few Squid will have to wait for them to
#       process a backlog of H(A1) calculations, slowing it down.
#       When the H(A1) calculations are done via a (slow) network
#       you are likely to need lots of authenticator processes.
#       auth_param digest children 5
#
#       "realm" realmstring
#       Specifies the realm name which is to be reported to the
#       client for the digest proxy authentication scheme (part of
#       the text the user will see when prompted their username and
#       password). There is no default.
#       auth_param digest realm Squid proxy-caching web server
#
#       "nonce_garbage_interval" timeinterval
#       Specifies the interval that nonces that have been issued
#       to client_agent's are checked for validity.
#
#       "nonce_max_duration" timeinterval
#       Specifies the maximum length of time a given nonce will be
#       valid for.
#
#       "nonce_max_count" number
#       Specifies the maximum number of times a given nonce can be
#       used.
#
#       "nonce_strictness" on|off
#       Determines if squid requires strict increment-by-1 behavior
#       for nonce counts, or just incrementing (off - for use when
#       useragents generate nonce counts that occasionally miss 1
#       (ie, 1,2,4,6)). Default off.
#
#       "check_nonce_count" on|off
#       This directive if set to off can disable the nonce count check
#       completely to work around buggy digest qop implementations in
#       certain mainstream browser versions. Default on to check the
#       nonce count to protect from authentication replay attacks.
#
#       "post_workaround" on|off
#       This is a workaround to certain buggy browsers who sends
#       an incorrect request digest in POST requests when reusing
#       the same nonce as acquired earlier on a GET request.
#
#       === NTLM scheme options follow ===
#
#       "program" cmdline
#       Specify the command for the external NTLM authenticator.
#       Such a program reads exchanged NTLMSSP packets with
#       the browser via Squid until authentication is completed.
#       If you use an NTLM authenticator, make sure you have 1 acl
#       of type proxy_auth.  By default, the NTLM authenticator_program
#       is not used.
#
#       auth_param ntlm program /usr/lib/squid3/ntlm_auth
#
#       "children" numberofchildren
#       The number of authenticator processes to spawn (no default).
#       If you start too few Squid will have to wait for them to
#       process a backlog of credential verifications, slowing it
#       down. When credential verifications are done via a (slow)
#       network you are likely to need lots of authenticator
#       processes.
#
#       auth_param ntlm children 5
#
#       "keep_alive" on|off
#       If you experience problems with PUT/POST requests when using the
#       Negotiate authentication scheme then you can try setting this to
#       off. This will cause Squid to forcibly close the connection on
#       the initial requests where the browser asks which schemes are
#       supported by the proxy.
#
#       auth_param ntlm keep_alive on
#
#       === Options for configuring the NEGOTIATE auth-scheme follow ===
#
#       "program" cmdline
#       Specify the command for the external Negotiate authenticator.
#       This protocol is used in Microsoft Active-Directory enabled setups with
#       the Microsoft Internet Explorer or Mozilla Firefox browsers.
#       Its main purpose is to exchange credentials with the Squid proxy
#       using the Kerberos mechanisms.
#       If you use a Negotiate authenticator, make sure you have at least
#       one acl of type proxy_auth active. By default, the negotiate
#       authenticator_program is not used.
#       The only supported program for this role is the ntlm_auth
#       program distributed as part of Samba, version 4 or later.
#
#       auth_param negotiate program /usr/lib/squid3/ntlm_auth --helper-protocol=gss-spnego
#
#       "children" numberofchildren
#       The number of authenticator processes to spawn (no default).
#       If you start too few Squid will have to wait for them to
#       process a backlog of credential verifications, slowing it
#       down. When crendential verifications are done via a (slow)
#       network you are likely to need lots of authenticator
#       processes.
#       auth_param negotiate children 5
#
#       "keep_alive" on|off
#       If you experience problems with PUT/POST requests when using the
#       Negotiate authentication scheme then you can try setting this to
#       off. This will cause Squid to forcibly close the connection on
#       the initial requests where the browser asks which schemes are
#       supported by the proxy.
#
#       auth_param negotiate keep_alive on
#
#       
#       Examples:
#
##Recommended minimum configuration per scheme:
##auth_param negotiate program <uncomment and complete this line to activate>
##auth_param negotiate children 5
##auth_param negotiate keep_alive on
##
##auth_param ntlm program <uncomment and complete this line to activate>
##auth_param ntlm children 5
##auth_param ntlm keep_alive on
##
##auth_param digest program <uncomment and complete this line>
##auth_param digest children 5
##auth_param digest realm Squid proxy-caching web server
##auth_param digest nonce_garbage_interval 5 minutes
##auth_param digest nonce_max_duration 30 minutes
##auth_param digest nonce_max_count 50
##
##auth_param basic program <uncomment and complete this line>
##auth_param basic children 5
##auth_param basic realm Squid proxy-caching web server
##auth_param basic credentialsttl 2 hours
#Default:
# none

#  TAG: authenticate_cache_garbage_interval
#       The time period between garbage collection across the username cache.
#       This is a tradeoff between memory utilization (long intervals - say
#       2 days) and CPU (short intervals - say 1 minute). Only change if you
#       have good reason to.
#Default:
# authenticate_cache_garbage_interval 1 hour

#  TAG: authenticate_ttl
#       The time a user & their credentials stay in the logged in
#       user cache since their last request. When the garbage
#       interval passes, all user credentials that have passed their
#       TTL are removed from memory.
#Default:
# authenticate_ttl 1 hour

#  TAG: authenticate_ip_ttl
#       If you use proxy authentication and the 'max_user_ip' ACL,
#       this directive controls how long Squid remembers the IP
#       addresses associated with each user.  Use a small value
#       (e.g., 60 seconds) if your users might change addresses
#       quickly, as is the case with dialups.   You might be safe
#       using a larger value (e.g., 2 hours) in a corporate LAN
#       environment with relatively static address assignments.
#Default:
# authenticate_ip_ttl 0 seconds

# ACCESS CONTROLS
# -----------------------------------------------------------------------------

#  TAG: external_acl_type
#       This option defines external acl classes using a helper program
#       to look up the status
#
#         external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..]
#
#       Options:
#
#         ttl=n         TTL in seconds for cached results (defaults to 3600
#                       for 1 hour)
#         negative_ttl=n
#                       TTL for cached negative lookups (default same
#                       as ttl)
#         children=n    Number of acl helper processes spawn to service
#                       external acl lookups of this type. (default 5)
#         concurrency=n concurrency level per process. Only used with helpers
#                       capable of processing more than one query at a time.
#         cache=n       result cache size, 0 is unbounded (default)
#         grace=n       Percentage remaining of TTL where a refresh of a
#                       cached entry should be initiated without needing to
#                       wait for a new reply. (default 0 for no grace period)
#         protocol=2.5  Compatibility mode for Squid-2.5 external acl helpers
#         ipv4 / ipv6   IP-mode used to communicate to this helper.
#                       For compatability with older configurations and helpers
#                       the default is currently 'ipv4'.
#
#       FORMAT specifications
#
#         %LOGIN        Authenticated user login name
#         %EXT_USER     Username from external acl
#         %IDENT        Ident user name
#         %SRC          Client IP
#         %SRCPORT      Client source port
#         %URI          Requested URI
#         %DST          Requested host
#         %PROTO        Requested protocol
#         %PORT         Requested port
#         %PATH         Requested URL path
#         %METHOD       Request method
#         %MYADDR       Squid interface address
#         %MYPORT       Squid http_port number
#         %PATH         Requested URL-path (including query-string if any)
#         %USER_CERT    SSL User certificate in PEM format
#         %USER_CERTCHAIN SSL User certificate chain in PEM format
#         %USER_CERT_xx SSL User certificate subject attribute xx
#         %USER_CA_xx   SSL User certificate issuer attribute xx
#
#         %>{Header}    HTTP request header "Header"
#         %>{Hdr:member}
#                       HTTP request header "Hdr" list member "member"
#         %>{Hdr:;member}
#                       HTTP request header list member using ; as
#                       list separator. ; can be any non-alphanumeric
#                       character.
#
#         %<{Header}    HTTP reply header "Header"
#         %<{Hdr:member}
#                       HTTP reply header "Hdr" list member "member"
#         %<{Hdr:;member}
#                       HTTP reply header list member using ; as
#                       list separator. ; can be any non-alphanumeric
#                       character.
#
#       In addition to the above, any string specified in the referencing
#       acl will also be included in the helper request line, after the
#       specified formats (see the "acl external" directive)
#
#       The helper receives lines per the above format specification,
#       and returns lines starting with OK or ERR indicating the validity
#       of the request and optionally followed by additional keywords with
#       more details.
#
#       General result syntax:
#
#         OK/ERR keyword=value ...
#
#       Defined keywords:
#
#         user=         The users name (login)
#         password=     The users password (for login= cache_peer option)
#         message=      Message describing the reason. Available as %o
#                       in error pages
#         tag=          Apply a tag to a request (for both ERR and OK results)
#                       Only sets a tag, does not alter existing tags.
#         log=          String to be logged in access.log. Available as
#                       %ea in logformat specifications
#
#       If protocol=3.0 (the default) then URL escaping is used to protect
#       each value in both requests and responses.
#
#       If using protocol=2.5 then all values need to be enclosed in quotes
#       if they may contain whitespace, or the whitespace escaped using \.
#       And quotes or \ characters within the keyword value must be \ escaped.
#
#       When using the concurrency= option the protocol is changed by
#       introducing a query channel tag infront of the request/response.
#       The query channel tag is a number between 0 and concurrency-1.
#Default:
# none

#  TAG: acl
#       Defining an Access List
#
#       Every access list definition must begin with an aclname and acltype, 
#       followed by either type-specific arguments or a quoted filename that
#       they are read from.
#
#          acl aclname acltype argument ...
#          acl aclname acltype "file" ...
#
#       When using "file", the file should contain one item per line.
#
#       By default, regular expressions are CASE-SENSITIVE.  To make
#       them case-insensitive, use the -i option.
#
#       Some acl types require suspending the current request in order
#       to access some external data source.
#       Those which do are marked with the tag [slow], those which
#       don't are marked as [fast].
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl
#       for further information
#
#       ***** ACL TYPES AVAILABLE *****
#
#       acl aclname src ip-address/netmask ...  # clients IP address [fast]
#       acl aclname src addr1-addr2/netmask ... # range of addresses [fast]
#       acl aclname dst ip-address/netmask ...  # URL host's IP address [slow]
#       acl aclname myip ip-address/netmask ... # local socket IP address [fast]
#
#       acl aclname arp      mac-address ... (xx:xx:xx:xx:xx:xx notation)
#         # The arp ACL requires the special configure option --enable-arp-acl.
#         # Furthermore, the ARP ACL code is not portable to all operating systems.
#         # It works on Linux, Solaris, Windows, FreeBSD, and some
#         # other *BSD variants.
#         # [fast]
#         #
#         # NOTE: Squid can only determine the MAC address for clients that are on
#         # the same subnet. If the client is on a different subnet,
#         # then Squid cannot find out its MAC address.
#
#       acl aclname srcdomain   .foo.com ...
#         # reverse lookup, from client IP [slow]
#       acl aclname dstdomain   .foo.com ...
#         # Destination server from URL [fast]
#       acl aclname srcdom_regex [-i] \.foo\.com ...
#         # regex matching client name [slow]
#       acl aclname dstdom_regex [-i] \.foo\.com ...
#         # regex matching server [fast]
#         #
#         # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
#         # based URL is used and no match is found. The name "none" is used
#         # if the reverse lookup fails.
#
#       acl aclname src_as number ...
#       acl aclname dst_as number ...
#         # [fast]
#         # Except for access control, AS numbers can be used for
#         # routing of requests to specific caches. Here's an
#         # example for routing all requests for AS#1241 and only
#         # those to mycache.mydomain.net:
#         # acl asexample dst_as 1241
#         # cache_peer_access mycache.mydomain.net allow asexample
#         # cache_peer_access mycache_mydomain.net deny all
#
#       acl aclname peername myPeer ...
#         # [fast]
#         # match against a named cache_peer entry
#         # set unique name= on cache_peer lines for reliable use.
#
#       acl aclname time [day-abbrevs] [h1:m1-h2:m2]
#         # [fast]
#         #  day-abbrevs:
#         #     S - Sunday
#         #     M - Monday
#         #     T - Tuesday
#         #     W - Wednesday
#         #     H - Thursday
#         #     F - Friday
#         #     A - Saturday
#         #  h1:m1 must be less than h2:m2
#
#       acl aclname url_regex [-i] ^http:// ...
#         # regex matching on whole URL [fast]
#       acl aclname urlpath_regex [-i] \.gif$ ...
#         # regex matching on URL path [fast]
#
#       acl aclname port 80 70 21 0-1024...   # destination TCP port [fast]
#                                             # ranges are alloed
#       acl aclname myport 3128 ...               # local socket TCP port [fast]
#       acl aclname myportname 3128 ...       # http(s)_port name [fast]
#
#       acl aclname proto HTTP FTP ...        # request protocol [fast]
# 
#       acl aclname method GET POST ...       # HTTP request method [fast]
#
#       acl aclname http_status 200 301 500- 400-403 ... 
#         # status code in reply [fast]
#
#       acl aclname browser [-i] regexp ...
#         # pattern match on User-Agent header (see also req_header below) [fast]
#
#       acl aclname referer_regex [-i] regexp ...
#         # pattern match on Referer header [fast]
#         # Referer is highly unreliable, so use with care
#
#       acl aclname ident username ...
#       acl aclname ident_regex [-i] pattern ...
#         # string match on ident output [slow]
#         # use REQUIRED to accept any non-null ident.
#
#       acl aclname proxy_auth [-i] username ...
#       acl aclname proxy_auth_regex [-i] pattern ...
#         # perform http authentication challenge to the client and match against
#         # supplied credentials [slow]
#         #
#         # takes a list of allowed usernames.
#         # use REQUIRED to accept any valid username.
#         #
#         # Will use proxy authentication in forward-proxy scenarios, and plain
#         # http authenticaiton in reverse-proxy scenarios
#         #
#         # NOTE: when a Proxy-Authentication header is sent but it is not
#         # needed during ACL checking the username is NOT logged
#         # in access.log.
#         #
#         # NOTE: proxy_auth requires a EXTERNAL authentication program
#         # to check username/password combinations (see
#         # auth_param directive).
#         #
#         # NOTE: proxy_auth can't be used in a transparent/intercepting proxy
#         # as the browser needs to be configured for using a proxy in order
#         # to respond to proxy authentication.
#
#       acl aclname snmp_community string ...
#         # A community string to limit access to your SNMP Agent [fast]
#         # Example:
#         #
#         #     acl snmppublic snmp_community public
#
#       acl aclname maxconn number
#         # This will be matched when the client's IP address has
#         # more than <number> HTTP connections established. [fast]
#
#       acl aclname max_user_ip [-s] number
#         # This will be matched when the user attempts to log in from more
#         # than <number> different ip addresses. The authenticate_ip_ttl
#         # parameter controls the timeout on the ip entries. [fast]
#         # If -s is specified the limit is strict, denying browsing
#         # from any further IP addresses until the ttl has expired. Without
#         # -s Squid will just annoy the user by "randomly" denying requests.
#         # (the counter is reset each time the limit is reached and a
#         # request is denied)
#         # NOTE: in acceleration mode or where there is mesh of child proxies,
#         # clients may appear to come from multiple addresses if they are
#         # going through proxy farms, so a limit of 1 may cause user problems.
#
#       acl aclname req_mime_type [-i] mime-type ...
#         # regex match against the mime type of the request generated
#         # by the client. Can be used to detect file upload or some
#         # types HTTP tunneling requests [fast]
#         # NOTE: This does NOT match the reply. You cannot use this
#         # to match the returned file type.
#
#       acl aclname req_header header-name [-i] any\.regex\.here
#         # regex match against any of the known request headers.  May be
#         # thought of as a superset of "browser", "referer" and "mime-type"
#         # ACL [fast]
#
#       acl aclname rep_mime_type [-i] mime-type ...
#         # regex match against the mime type of the reply received by
#         # squid. Can be used to detect file download or some
#         # types HTTP tunneling requests. [fast]
#         # NOTE: This has no effect in http_access rules. It only has
#         # effect in rules that affect the reply data stream such as
#         # http_reply_access.
#
#       acl aclname rep_header header-name [-i] any\.regex\.here
#         # regex match against any of the known reply headers. May be
#         # thought of as a superset of "browser", "referer" and "mime-type"
#         # ACLs [fast]
#
#       acl aclname external class_name [arguments...]
#         # external ACL lookup via a helper class defined by the
#         # external_acl_type directive [slow]
#
#       acl aclname user_cert attribute values...
#         # match against attributes in a user SSL certificate
#         # attribute is one of DN/C/O/CN/L/ST [fast]
#
#       acl aclname ca_cert attribute values...
#         # match against attributes a users issuing CA SSL certificate
#         # attribute is one of DN/C/O/CN/L/ST [fast]
#
#       acl aclname ext_user username ...
#       acl aclname ext_user_regex [-i] pattern ...
#         # string match on username returned by external acl helper [slow]
#         # use REQUIRED to accept any non-null user name.
#
#       acl aclname tag tagvalue ...
#         # string match on tag returned by external acl helper [slow]
#
#       Examples:
#               acl macaddress arp 09:00:2b:23:45:67
#               acl myexample dst_as 1241
#               acl password proxy_auth REQUIRED
#               acl fileupload req_mime_type -i ^multipart/form-data$
#               acl javascript rep_mime_type -i ^application/x-javascript$
#
#Default:
# acl all src all
#
#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
#acl localnet src 10.0.0.0/8    # RFC1918 possible internal network
#acl localnet src 172.16.0.0/12 # RFC1918 possible internal network
#acl localnet src 192.168.0.0/16        # RFC1918 possible internal network
#acl localnet src fc00::/7       # RFC 4193 local private network range
#acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines
acl localnet src 10.139.2.0/24

acl own_ip src 10.139.2.220/32  # Own IP Address

acl SSL_ports port 443          # https
acl SSL_ports port 563          # snews
acl SSL_ports port 873          # rsync
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl Safe_ports port 631         # cups
acl Safe_ports port 873         # rsync
acl Safe_ports port 901         # SWAT
acl Safe_ports port 82          # Correo Educastur
acl purge method PURGE
acl CONNECT method CONNECT

#  TAG: follow_x_forwarded_for
#       Allowing or Denying the X-Forwarded-For header to be followed to
#       find the original source of a request.
#
#       Requests may pass through a chain of several other proxies
#       before reaching us.  The X-Forwarded-For header will contain a
#       comma-separated list of the IP addresses in the chain, with the
#       rightmost address being the most recent.
#
#       If a request reaches us from a source that is allowed by this
#       configuration item, then we consult the X-Forwarded-For header
#       to see where that host received the request from.  If the
#       X-Forwarded-For header contains multiple addresses, we continue
#       backtracking until we reach an address for which we are not allowed
#       to follow the X-Forwarded-For header, or until we reach the first
#       address in the list. For the purpose of ACL used in the
#       follow_x_forwarded_for directive the src ACL type always matches
#       the address we are testing and srcdomain matches its rDNS.
#
#       The end result of this process is an IP address that we will
#       refer to as the indirect client address.  This address may
#       be treated as the client address for access control, ICAP, delay
#       pools and logging, depending on the acl_uses_indirect_client,
#       icap_uses_indirect_client, delay_pool_uses_indirect_client and
#       log_uses_indirect_client options.
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
#       SECURITY CONSIDERATIONS:
#
#               Any host for which we follow the X-Forwarded-For header
#               can place incorrect information in the header, and Squid
#               will use the incorrect information as if it were the
#               source address of the request.  This may enable remote
#               hosts to bypass any access control restrictions that are
#               based on the client's source addresses.
#
#       For example:
#
#               acl localhost src 127.0.0.1
#               acl my_other_proxy srcdomain .proxy.example.com
#               follow_x_forwarded_for allow localhost
#               follow_x_forwarded_for allow my_other_proxy
#Default:
# follow_x_forwarded_for deny all

#  TAG: acl_uses_indirect_client        on|off
#       Controls whether the indirect client address
#       (see follow_x_forwarded_for) is used instead of the
#       direct client address in acl matching.
#Default:
# acl_uses_indirect_client on

#  TAG: delay_pool_uses_indirect_client on|off
#       Controls whether the indirect client address
#       (see follow_x_forwarded_for) is used instead of the
#       direct client address in delay pools.
#Default:
# delay_pool_uses_indirect_client on

#  TAG: log_uses_indirect_client        on|off
#       Controls whether the indirect client address
#       (see follow_x_forwarded_for) is used instead of the
#       direct client address in the access log.
#Default:
# log_uses_indirect_client on

#  TAG: http_access
#       Allowing or Denying access based on defined access lists
#
#       Access to the HTTP port:
#       http_access allow|deny [!]aclname ...
#
#       NOTE on default values:
#
#       If there are no "access" lines present, the default is to deny
#       the request.
#
#       If none of the "access" lines cause a match, the default is the
#       opposite of the last line in the list.  If the last line was
#       deny, the default is allow.  Conversely, if the last line
#       is allow, the default will be deny.  For these reasons, it is a
#       good idea to have an "deny all" entry at the end of your access
#       lists to avoid potential confusion.
#
#       This clause supports both fast and slow acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
#Default:
# http_access deny all
#

#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost
http_access allow own_ip

# And finally deny all other access to this proxy
http_access deny all

#  TAG: adapted_http_access
#       Allowing or Denying access based on defined access lists
#
#       Essentially identical to http_access, but runs after redirectors
#       and ICAP/eCAP adaptation. Allowing access control based on their
#       output.
#
#       If not set then only http_access is used.
#Default:
# none

#  TAG: http_reply_access
#       Allow replies to client requests. This is complementary to http_access.
#
#       http_reply_access allow|deny [!] aclname ...
#
#       NOTE: if there are no access lines present, the default is to allow
#       all replies
#
#       If none of the access lines cause a match the opposite of the
#       last line will apply. Thus it is good practice to end the rules
#       with an "allow all" or "deny all" entry.
#
#       This clause supports both fast and slow acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# none

#  TAG: icp_access
#       Allowing or Denying access to the ICP port based on defined
#       access lists
#
#       icp_access  allow|deny [!]aclname ...
#
#       See http_access for details
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
## Allow ICP queries from local networks only
##icp_access allow localnet
##icp_access deny all
#Default:
# icp_access deny all

#  TAG: htcp_access
#       Allowing or Denying access to the HTCP port based on defined
#       access lists
#
#       htcp_access  allow|deny [!]aclname ...
#
#       See http_access for details
#
#       NOTE: The default if no htcp_access lines are present is to
#       deny all traffic. This default may cause problems with peers
#       using the htcp or htcp-oldsquid options.
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
## Allow HTCP queries from local networks only
##htcp_access allow localnet
##htcp_access deny all
#Default:
# htcp_access deny all

#  TAG: htcp_clr_access
#       Allowing or Denying access to purge content using HTCP based
#       on defined access lists
#
#       htcp_clr_access  allow|deny [!]aclname ...
#
#       See http_access for details
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
## Allow HTCP CLR requests from trusted peers
#acl htcp_clr_peer src 172.16.1.2
#htcp_clr_access allow htcp_clr_peer
#Default:
# htcp_clr_access deny all

#  TAG: miss_access
#       Use to force your neighbors to use you as a sibling instead of
#       a parent.  For example:
#
#               acl localclients src 172.16.0.0/16
#               miss_access allow localclients
#               miss_access deny  !localclients
#
#       This means only your local clients are allowed to fetch
#       MISSES and all other clients can only fetch HITS.
#
#       By default, allow all clients who passed the http_access rules
#       to fetch MISSES from us.
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# miss_access allow all

#  TAG: ident_lookup_access
#       A list of ACL elements which, if matched, cause an ident
#       (RFC 931) lookup to be performed for this request.  For
#       example, you might choose to always perform ident lookups
#       for your main multi-user Unix boxes, but not for your Macs
#       and PCs.  By default, ident lookups are not performed for
#       any requests.
#
#       To enable ident lookups for specific client addresses, you
#       can follow this example:
#
#       acl ident_aware_hosts src 198.168.1.0/24
#       ident_lookup_access allow ident_aware_hosts
#       ident_lookup_access deny all
#
#       Only src type ACL checks are fully supported.  A srcdomain
#       ACL might work at times, but it will not always provide
#       the correct result.
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# ident_lookup_access deny all

#  TAG: reply_body_max_size     size [acl acl...]
#       This option specifies the maximum size of a reply body. It can be
#       used to prevent users from downloading very large files, such as
#       MP3's and movies. When the reply headers are received, the
#       reply_body_max_size lines are processed, and the first line where
#       all (if any) listed ACLs are true is used as the maximum body size
#       for this reply.
#
#       This size is checked twice. First when we get the reply headers,
#       we check the content-length value.  If the content length value exists
#       and is larger than the allowed size, the request is denied and the
#       user receives an error message that says "the request or reply
#       is too large." If there is no content-length, and the reply
#       size exceeds this limit, the client's connection is just closed
#       and they will receive a partial reply.
#
#       WARNING: downstream caches probably can not detect a partial reply
#       if there is no content-length header, so they will cache
#       partial responses and give them out as hits.  You should NOT
#       use this option if you have downstream caches.
#
#       WARNING: A maximum size smaller than the size of squid's error messages
#       will cause an infinite loop and crash squid. Ensure that the smallest
#       non-zero value you use is greater that the maximum header size plus
#       the size of your largest error page.
#
#       If you set this parameter none (the default), there will be
#       no limit imposed.
#
#       Configuration Format is:
#               reply_body_max_size SIZE UNITS [acl ...]
#       ie.
#               reply_body_max_size 10 MB
#
#Default:
# none

# NETWORK OPTIONS
# -----------------------------------------------------------------------------

#  TAG: http_port
#       Usage:  port [options]
#               hostname:port [options]
#               1.2.3.4:port [options]
#
#       The socket addresses where Squid will listen for HTTP client
#       requests.  You may specify multiple socket addresses.
#       There are three forms: port alone, hostname with port, and
#       IP address with port.  If you specify a hostname or IP
#       address, Squid binds the socket to that specific
#       address.  This replaces the old 'tcp_incoming_address'
#       option.  Most likely, you do not need to bind to a specific
#       address, so you can use the port number alone.
#
#       If you are running Squid in accelerator mode, you
#       probably want to listen on port 80 also, or instead.
#
#       The -a command line option may be used to specify additional
#       port(s) where Squid listens for proxy request. Such ports will
#       be plain proxy ports with no options.
#
#       You may specify multiple socket addresses on multiple lines.
#
#       Options:
#
#          intercept    Support for IP-Layer interception of
#                       outgoing requests without browser settings.
#                       NP: disables authentication and IPv6 on the port.
#
#          tproxy       Support Linux TPROXY for spoofing outgoing
#                       connections using the client IP address.
#                       NP: disables authentication and maybe IPv6 on the port.
#
#          accel        Accelerator mode. Also needs at least one of
#                       vhost / vport / defaultsite.
#
#          allow-direct Allow direct forwarding in accelerator mode. Normally
#                       accelerated requests are denied direct forwarding as if
#                       never_direct was used.
#
#          defaultsite=domainname
#                       What to use for the Host: header if it is not present
#                       in a request. Determines what site (not origin server)
#                       accelerators should consider the default.
#                       Implies accel.
#
#          vhost        Accelerator mode using Host header for virtual
#                       domain support. Implies accel.
#
#          vport        Accelerator with IP based virtual host support.
#                       Implies accel.
#
#          vport=NN     As above, but uses specified port number rather
#                       than the http_port number. Implies accel.
#
#          protocol=    Protocol to reconstruct accelerated requests with.
#                       Defaults to http.
#
#          ignore-cc    Ignore request Cache-Control headers.
#
#                       Warning: This option violates HTTP specifications if
#                       used in non-accelerator setups.
#
#          connection-auth[=on|off]
#                       use connection-auth=off to tell Squid to prevent 
#                       forwarding Microsoft connection oriented authentication
#                       (NTLM, Negotiate and Kerberos)
#
#          disable-pmtu-discovery=
#                       Control Path-MTU discovery usage:
#                           off         lets OS decide on what to do (default).
#                           transparent disable PMTU discovery when transparent
#                                       support is enabled.
#                           always      disable always PMTU discovery.
#
#                       In many setups of transparently intercepting proxies
#                       Path-MTU discovery can not work on traffic towards the
#                       clients. This is the case when the intercepting device
#                       does not fully track connections and fails to forward
#                       ICMP must fragment messages to the cache server. If you
#                       have such setup and experience that certain clients
#                       sporadically hang or never complete requests set
#                       disable-pmtu-discovery option to 'transparent'.
#
#          sslBump      Intercept each CONNECT request matching ssl_bump ACL,
#                       establish secure connection with the client and with
#                       the server, decrypt HTTP messages as they pass through
#                       Squid, and treat them as unencrypted HTTP messages,
#                       becoming the man-in-the-middle.
#
#                       When this option is enabled, additional options become
#                       available to specify SSL-related properties of the
#                       client-side connection: cert, key, version, cipher,
#                       options, clientca, cafile, capath, crlfile, dhparams,
#                       sslflags, and sslcontext. See the https_port directive
#                       for more information on these options.
#
#                       The ssl_bump option is required to fully enable
#                       the SslBump feature.
#
#          name=        Specifies a internal name for the port. Defaults to
#                       the port specification (port or addr:port)
#
#          tcpkeepalive[=idle,interval,timeout]
#                       Enable TCP keepalive probes of idle connections.
#                       In seconds; idle is the initial time before TCP starts
#                       probing the connection, interval how often to probe, and
#                       timeout the time before giving up.
#
#       If you run Squid on a dual-homed machine with an internal
#       and an external interface we recommend you to specify the
#       internal address:port in http_port. This way Squid will only be
#       visible on the internal address.
#
#

# Squid normally listens to port 3128
#http_port 3128
http_port 8080

#  TAG: https_port
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Usage:  [ip:]port cert=certificate.pem [key=key.pem] [options...]
#
#       The socket address where Squid will listen for HTTPS client
#       requests.
#
#       This is really only useful for situations where you are running
#       squid in accelerator mode and you want to do the SSL work at the
#       accelerator level.
#
#       You may specify multiple socket addresses on multiple lines,
#       each with their own SSL certificate and/or options.
#
#       Options:
#
#          accel        Accelerator mode. Also needs at least one of
#                       defaultsite or vhost.
#
#          defaultsite= The name of the https site presented on
#                       this port. Implies accel.
#
#          vhost        Accelerator mode using Host header for virtual
#                       domain support. Requires a wildcard certificate
#                       or other certificate valid for more than one domain.
#                       Implies accel.
#
#          protocol=    Protocol to reconstruct accelerated requests with.
#                       Defaults to https.
#
#          cert=        Path to SSL certificate (PEM format).
#
#          key=         Path to SSL private key file (PEM format)
#                       if not specified, the certificate file is
#                       assumed to be a combined certificate and
#                       key file.
#
#          version=     The version of SSL/TLS supported
#                           1   automatic (default)
#                           2   SSLv2 only
#                           3   SSLv3 only
#                           4   TLSv1 only
#
#          cipher=      Colon separated list of supported ciphers.
#
#          options=     Various SSL engine options. The most important
#                       being:
#                           NO_SSLv2  Disallow the use of SSLv2
#                           NO_SSLv3  Disallow the use of SSLv3
#                           NO_TLSv1  Disallow the use of TLSv1
#                           SINGLE_DH_USE Always create a new key when using
#                                     temporary/ephemeral DH key exchanges
#                       See src/ssl_support.c or OpenSSL SSL_CTX_set_options
#                       documentation for a complete list of options.
#
#          clientca=    File containing the list of CAs to use when
#                       requesting a client certificate.
#
#          cafile=      File containing additional CA certificates to
#                       use when verifying client certificates. If unset
#                       clientca will be used.
#
#          capath=      Directory containing additional CA certificates
#                       and CRL lists to use when verifying client certificates.
#
#          crlfile=     File of additional CRL lists to use when verifying
#                       the client certificate, in addition to CRLs stored in
#                       the capath. Implies VERIFY_CRL flag below.
#
#          dhparams=    File containing DH parameters for temporary/ephemeral
#                       DH key exchanges.
#
#          sslflags=    Various flags modifying the use of SSL:
#                           DELAYED_AUTH
#                               Don't request client certificates
#                               immediately, but wait until acl processing
#                               requires a certificate (not yet implemented).
#                           NO_DEFAULT_CA
#                               Don't use the default CA lists built in
#                               to OpenSSL.
#                           NO_SESSION_REUSE
#                               Don't allow for session reuse. Each connection
#                               will result in a new SSL session.
#                           VERIFY_CRL
#                               Verify CRL lists when accepting client
#                               certificates.
#                           VERIFY_CRL_ALL
#                               Verify CRL lists for all certificates in the
#                               client certificate chain.
#
#          sslcontext=  SSL session ID context identifier.
#
#          vport        Accelerator with IP based virtual host support.
#
#          vport=NN     As above, but uses specified port number rather
#                       than the https_port number. Implies accel.
#
#          name=        Specifies a internal name for the port. Defaults to
#                       the port specification (port or addr:port)
#
#Default:
# none

#  TAG: tcp_outgoing_tos
#       Allows you to select a TOS/Diffserv value to mark outgoing
#       connections with, based on the username or source address
#       making the request.
#
#       tcp_outgoing_tos ds-field [!]aclname ...
#
#       Example where normal_service_net uses the TOS value 0x00
#       and good_service_net uses 0x20
#
#       acl normal_service_net src 10.0.0.0/255.255.255.0
#       acl good_service_net src 10.0.1.0/255.255.255.0
#       tcp_outgoing_tos 0x00 normal_service_net
#       tcp_outgoing_tos 0x20 good_service_net
#
#       TOS/DSCP values really only have local significance - so you should
#       know what you're specifying. For more information, see RFC2474,
#       RFC2475, and RFC3260.
#
#       The TOS/DSCP byte must be exactly that - a octet value  0 - 255, or
#       "default" to use whatever default your host has. Note that in
#       practice often only values 0 - 63 is usable as the two highest bits
#       have been redefined for use by ECN (RFC3168).
#
#       Processing proceeds in the order specified, and stops at first fully
#       matching line.
#
#       Note: The use of this directive using client dependent ACLs is
#       incompatible with the use of server side persistent connections. To
#       ensure correct results it is best to set server_persisten_connections
#       to off when using this directive in such configurations.
#Default:
# none

#  TAG: clientside_tos
#       Allows you to select a TOS/Diffserv value to mark client-side
#       connections with, based on the username or source address
#       making the request.
#Default:
# none

#  TAG: qos_flows
# Note: This option is only available if Squid is rebuilt with the
#       --enable-zph-qos option
#
#       Allows you to select a TOS/DSCP value to mark outgoing
#       connections with, based on where the reply was sourced.
#
#       TOS values really only have local significance - so you should
#       know what you're specifying. For more information, see RFC2474,
#       RFC2475, and RFC3260.
#
#       The TOS/DSCP byte must be exactly that - octet value 0x00-0xFF.
#       Note that in practice often only values up to 0x3F are usable
#       as the two highest bits have been redefined for use by ECN
#       (RFC3168).
#
#       This setting is configured by setting the source TOS values:
#
#       local-hit=0xFF          Value to mark local cache hits.
#
#       sibling-hit=0xFF        Value to mark hits from sibling peers.
#
#       parent-hit=0xFF         Value to mark hits from parent peers.
#
#
#       NOTE: 'miss' preserve feature is only possible on Linux at this time.
#
#       For the following to work correctly, you will need to patch your
#       linux kernel with the TOS preserving ZPH patch.
#       The kernel patch can be downloaded from http://zph.bratcheda.org
#
#       disable-preserve-miss
#               By default, the existing TOS value of the response coming
#               from the remote server will be retained and masked with
#               miss-mark. This option disables that feature.
#
#       miss-mask=0xFF
#               Allows you to mask certain bits in the TOS received from the
#               remote server, before copying the value to the TOS sent
#               towards clients.
#               Default: 0xFF (TOS from server is not changed).
#
#Default:
# none

#  TAG: tcp_outgoing_address
#       Allows you to map requests to different outgoing IP addresses
#       based on the username or source address of the user making
#       the request.
#
#       tcp_outgoing_address ipaddr [[!]aclname] ...
#
#       Example where requests from 10.0.0.0/24 will be forwarded
#       with source address 10.1.0.1, 10.0.2.0/24 forwarded with
#       source address 10.1.0.2 and the rest will be forwarded with
#       source address 10.1.0.3.
#
#       acl normal_service_net src 10.0.0.0/24
#       acl good_service_net src 10.0.2.0/24
#       tcp_outgoing_address 10.1.0.1 normal_service_net
#       tcp_outgoing_address 10.1.0.2 good_service_net
#       tcp_outgoing_address 10.1.0.3
#
#       Processing proceeds in the order specified, and stops at first fully
#       matching line.
#
#       Note: The use of this directive using client dependent ACLs is
#       incompatible with the use of server side persistent connections. To
#       ensure correct results it is best to set server_persistent_connections
#       to off when using this directive in such configurations.
#
#
#        IPv6 Magic:
#
#       Squid is built with a capability of bridging the IPv4 and IPv6 
#       internets.
#       tcp_outgoing_address as exampled above breaks this bridging by forcing
#       all outbound traffic through a certain IPv4 which may be on the wrong
#       side of the IPv4/IPv6 boundary.
#
#       To operate with tcp_outgoing_address and keep the bridging benefits
#       an additional ACL needs to be used which ensures the IPv6-bound traffic
#       is never forced or permitted out the IPv4 interface.
#
#       acl to_ipv6 dst ipv6
#       tcp_outgoing_address 2002::c001 good_service_net to_ipv6
#       tcp_outgoing_address 10.1.0.2 good_service_net !to_ipv6
#
#       tcp_outgoing_address 2002::beef normal_service_net to_ipv6
#       tcp_outgoing_address 10.1.0.1 normal_service_net !to_ipv6
#
#       tcp_outgoing_address 2002::1 to_ipv6
#       tcp_outgoing_address 10.1.0.3 !to_ipv6
#
#       WARNING:
#         'dst ipv6' bases its selection assuming DIRECT access.
#         If peers are used the peername ACL are needed to select outgoing
#         address which can link to the peer.
#
#         'dst ipv6' is a slow ACL. It will only work here if 'dst' is used
#         previously in the http_access rules to locate the destination IP.
#         Some more magic may be needed for that:
#           http_access allow to_ipv6 !all
#         (meaning, allow if to IPv6 but not from anywhere ;)
#
#Default:
# none

# SSL OPTIONS
# -----------------------------------------------------------------------------

#  TAG: ssl_unclean_shutdown
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Some browsers (especially MSIE) bugs out on SSL shutdown
#       messages.
#Default:
# ssl_unclean_shutdown off

#  TAG: ssl_engine
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       The OpenSSL engine to use. You will need to set this if you
#       would like to use hardware SSL acceleration for example.
#Default:
# none

#  TAG: sslproxy_client_certificate
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Client SSL Certificate to use when proxying https:// URLs
#Default:
# none

#  TAG: sslproxy_client_key
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Client SSL Key to use when proxying https:// URLs
#Default:
# none

#  TAG: sslproxy_version
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       SSL version level to use when proxying https:// URLs
#Default:
# sslproxy_version 1

#  TAG: sslproxy_options
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       SSL engine options to use when proxying https:// URLs
#       
#       The most important being:
#
#               NO_SSLv2  Disallow the use of SSLv2
#               NO_SSLv3  Disallow the use of SSLv3
#               NO_TLSv1  Disallow the use of TLSv1
#               SINGLE_DH_USE
#                       Always create a new key when using
#                       temporary/ephemeral DH key exchanges
#       
#       These options vary depending on your SSL engine.
#       See the OpenSSL SSL_CTX_set_options documentation for a
#       complete list of possible options.
#Default:
# none

#  TAG: sslproxy_cipher
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       SSL cipher list to use when proxying https:// URLs
#
#       Colon separated list of supported ciphers.
#Default:
# none

#  TAG: sslproxy_cafile
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       file containing CA certificates to use when verifying server
#       certificates while proxying https:// URLs
#Default:
# none

#  TAG: sslproxy_capath
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       directory containing CA certificates to use when verifying
#       server certificates while proxying https:// URLs
#Default:
# none

#  TAG: ssl_bump
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       This ACL controls which CONNECT requests to an http_port
#       marked with an sslBump flag are actually "bumped". Please 
#       see the sslBump flag of an http_port option for more details
#       about decoding proxied SSL connections.
#
#       By default, no requests are bumped.
#
#       See also: http_port sslBump
#   
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
#
#       # Example: Bump all requests except those originating from localhost and 
#       # those going to webax.com or example.com sites.
#
#       acl localhost src 127.0.0.1/32
#       acl broken_sites dstdomain .webax.com
#       acl broken_sites dstdomain .example.com
#       ssl_bump deny localhost
#       ssl_bump deny broken_sites
#       ssl_bump allow all
#Default:
# none

#  TAG: sslproxy_flags
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Various flags modifying the use of SSL while proxying https:// URLs:
#           DONT_VERIFY_PEER    Accept certificates that fail verification.
#                               For refined control, see sslproxy_cert_error.
#           NO_DEFAULT_CA       Don't use the default CA list built in
#                               to OpenSSL.
#Default:
# none

#  TAG: sslproxy_cert_error
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Use this ACL to bypass server certificate validation errors.
#
#       For example, the following lines will bypass all validation errors
#       when talking to servers located at 172.16.0.0/16. All other
#       validation errors will result in ERR_SECURE_CONNECT_FAIL error.
#
#               acl BrokenServersAtTrustedIP dst 172.16.0.0/16
#               sslproxy_cert_error allow BrokenServersAtTrustedIP
#               sslproxy_cert_error deny all
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#       Using slow acl types may result in server crashes
#
#       Without this option, all server certificate validation errors
#       terminate the transaction. Bypassing validation errors is dangerous
#       because an error usually implies that the server cannot be trusted and
#       the connection may be insecure.
#
#       See also: sslproxy_flags and DONT_VERIFY_PEER.
#
#       Default setting:  sslproxy_cert_error deny all
#Default:
# none

#  TAG: sslpassword_program
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ssl option
#
#       Specify a program used for entering SSL key passphrases
#       when using encrypted SSL certificate keys. If not specified
#       keys must either be unencrypted, or Squid started with the -N
#       option to allow it to query interactively for the passphrase.
#Default:
# none

# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
# -----------------------------------------------------------------------------

#  TAG: cache_peer
#       To specify other caches in a hierarchy, use the format:
#       
#               cache_peer hostname type http-port icp-port [options]
#       
#       For example,
#       
#       #                                        proxy  icp
#       #          hostname             type     port   port  options
#       #          -------------------- -------- ----- -----  -----------
#       cache_peer parent.foo.net       parent    3128  3130  default
#       cache_peer sib1.foo.net         sibling   3128  3130  proxy-only
#       cache_peer sib2.foo.net         sibling   3128  3130  proxy-only
#       cache_peer example.com          parent    80       0  no-query default
#       cache_peer cdn.example.com      sibling   3128     0  
#       
#             type:     either 'parent', 'sibling', or 'multicast'.
#       
#       proxy-port:     The port number where the peer accept HTTP requests.
#                       For other Squid proxies this is usually 3128
#                       For web servers this is usually 80
#       
#         icp-port:     Used for querying neighbor caches about objects.
#                       Set to 0 if the peer does not support ICP or HTCP.
#                       See ICP and HTCP options below for additional details.
#       
#       
#       ==== ICP OPTIONS ====
#       
#       You MUST also set icp_port and icp_access explicitly when using these options.
#       The defaults will prevent peer traffic using ICP.
#       
#       
#       no-query        Disable ICP queries to this neighbor.
#       
#       multicast-responder
#                       Indicates the named peer is a member of a multicast group.
#                       ICP queries will not be sent directly to the peer, but ICP
#                       replies will be accepted from it.
#       
#       closest-only    Indicates that, for ICP_OP_MISS replies, we'll only forward
#                       CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes.
#       
#       background-ping
#                       To only send ICP queries to this neighbor infrequently.
#                       This is used to keep the neighbor round trip time updated
#                       and is usually used in conjunction with weighted-round-robin.
#       
#       
#       ==== HTCP OPTIONS ====
#       
#       You MUST also set htcp_port and htcp_access explicitly when using these options.
#       The defaults will prevent peer traffic using HTCP.
#       
#       
#       htcp            Send HTCP, instead of ICP, queries to the neighbor.
#                       You probably also want to set the "icp-port" to 4827
#                       instead of 3130.
#       
#       htcp-oldsquid   Send HTCP to old Squid versions.
#       
#       htcp-no-clr     Send HTCP to the neighbor but without
#                       sending any CLR requests.  This cannot be used with
#                       htcp-only-clr.
#       
#       htcp-only-clr   Send HTCP to the neighbor but ONLY CLR requests.
#                       This cannot be used with htcp-no-clr.
#       
#       htcp-no-purge-clr
#                       Send HTCP to the neighbor including CLRs but only when
#                       they do not result from PURGE requests.
#       
#       htcp-forward-clr
#                       Forward any HTCP CLR requests this proxy receives to the peer.
#       
#       
#       ==== PEER SELECTION METHODS ====
#       
#       The default peer selection method is ICP, with the first responding peer
#       being used as source. These options can be used for better load balancing.
#       
#       
#       default         This is a parent cache which can be used as a "last-resort"
#                       if a peer cannot be located by any of the peer-selection methods.
#                       If specified more than once, only the first is used.
#       
#       round-robin     Load-Balance parents which should be used in a round-robin
#                       fashion in the absence of any ICP queries.
#                       weight=N can be used to add bias.
#       
#       weighted-round-robin
#                       Load-Balance parents which should be used in a round-robin
#                       fashion with the frequency of each parent being based on the
#                       round trip time. Closer parents are used more often.
#                       Usually used for background-ping parents.
#                       weight=N can be used to add bias.
#       
#       carp            Load-Balance parents which should be used as a CARP array.
#                       The requests will be distributed among the parents based on the
#                       CARP load balancing hash function based on their weight.
#       
#       userhash        Load-balance parents based on the client proxy_auth or ident username.
#       
#       sourcehash      Load-balance parents based on the client source IP.
#
#       multicast-siblings
#                       To be used only for cache peers of type "multicast".
#                       ALL members of this multicast group have "sibling"
#                       relationship with it, not "parent".  This is to a mulicast
#                       group when the requested object would be fetched only from
#                       a "parent" cache, anyway.  It's useful, e.g., when
#                       configuring a pool of redundant Squid proxies, being
#                       members of the same multicast group.
#       
#       
#       ==== PEER SELECTION OPTIONS ====
#       
#       weight=N        use to affect the selection of a peer during any weighted
#                       peer-selection mechanisms.
#                       The weight must be an integer; default is 1,
#                       larger weights are favored more.
#                       This option does not affect parent selection if a peering
#                       protocol is not in use.
#       
#       basetime=N      Specify a base amount to be subtracted from round trip
#                       times of parents.
#                       It is subtracted before division by weight in calculating
#                       which parent to fectch from. If the rtt is less than the
#                       base time the rtt is set to a minimal value.
#       
#       ttl=N           Specify a IP multicast TTL to use when sending an ICP
#                       queries to this address.
#                       Only useful when sending to a multicast group.
#                       Because we don't accept ICP replies from random
#                       hosts, you must configure other group members as
#                       peers with the 'multicast-responder' option.
#       
#       no-delay        To prevent access to this neighbor from influencing the
#                       delay pools.
#       
#       digest-url=URL  Tell Squid to fetch the cache digest (if digests are
#                       enabled) for this host from the specified URL rather
#                       than the Squid default location.
#       
#       
#       ==== ACCELERATOR / REVERSE-PROXY OPTIONS ====
#       
#       originserver    Causes this parent to be contacted as an origin server.
#                       Meant to be used in accelerator setups when the peer
#                       is a web server.
#       
#       forceddomain=name
#                       Set the Host header of requests forwarded to this peer.
#                       Useful in accelerator setups where the server (peer)
#                       expects a certain domain name but clients may request
#                       others. ie example.com or www.example.com
#       
#       no-digest       Disable request of cache digests.
#       
#       no-netdb-exchange
#                       Disables requesting ICMP RTT database (NetDB).
#       
#       
#       ==== AUTHENTICATION OPTIONS ====
#       
#       login=user:password
#                       If this is a personal/workgroup proxy and your parent
#                       requires proxy authentication.
#                       
#                       Note: The string can include URL escapes (i.e. %20 for
#                       spaces). This also means % must be written as %%.
#       
#       login=PROXYPASS
#                       Send login details received from client to this peer.
#                       Authentication is not required, nor changed.
#                       
#                       Note: This will pass any form of authentication but
#                       only Basic auth will work through a proxy unless the
#                       connection-auth options are also used.
#       
#       login=PASS      Send login details received from client to this peer.
#                       Authentication is not required by this option.
#                       If there are no client-provided authentication headers
#                       to pass on, but username and password are available
#                       from either proxy login or an external ACL user= and
#                       password= result tags they may be sent instead.
#                       
#                       Note: To combine this with proxy_auth both proxies must
#                       share the same user database as HTTP only allows for
#                       a single login (one for proxy, one for origin server).
#                       Also be warned this will expose your users proxy
#                       password to the peer. USE WITH CAUTION
#       
#       login=*:password
#                       Send the username to the upstream cache, but with a
#                       fixed password. This is meant to be used when the peer
#                       is in another administrative domain, but it is still
#                       needed to identify each user.
#                       The star can optionally be followed by some extra
#                       information which is added to the username. This can
#                       be used to identify this proxy to the peer, similar to
#                       the login=username:password option above.
#       
#       connection-auth=on|off
#                       Tell Squid that this peer does or not support Microsoft
#                       connection oriented authentication, and any such
#                       challenges received from there should be ignored.
#                       Default is auto to automatically determine the status
#                       of the peer.
#       
#       
#       ==== SSL / HTTPS / TLS OPTIONS ====
#       
#       ssl             Encrypt connections to this peer with SSL/TLS.
#       
#       sslcert=/path/to/ssl/certificate
#                       A client SSL certificate to use when connecting to
#                       this peer.
#       
#       sslkey=/path/to/ssl/key
#                       The private SSL key corresponding to sslcert above.
#                       If 'sslkey' is not specified 'sslcert' is assumed to
#                       reference a combined file containing both the
#                       certificate and the key.
#       
#       sslversion=1|2|3|4
#                       The SSL version to use when connecting to this peer
#                               1 = automatic (default)
#                               2 = SSL v2 only
#                               3 = SSL v3 only
#                               4 = TLS v1 only
#       
#       sslcipher=...   The list of valid SSL ciphers to use when connecting
#                       to this peer.
#       
#       ssloptions=...  Specify various SSL engine options:
#                               NO_SSLv2  Disallow the use of SSLv2
#                               NO_SSLv3  Disallow the use of SSLv3
#                               NO_TLSv1  Disallow the use of TLSv1
#                       See src/ssl_support.c or the OpenSSL documentation for
#                       a more complete list.
#       
#       sslcafile=...   A file containing additional CA certificates to use
#                       when verifying the peer certificate.
#       
#       sslcapath=...   A directory containing additional CA certificates to
#                       use when verifying the peer certificate.
#       
#       sslcrlfile=...  A certificate revocation list file to use when
#                       verifying the peer certificate.
#       
#       sslflags=...    Specify various flags modifying the SSL implementation:
#       
#                       DONT_VERIFY_PEER
#                               Accept certificates even if they fail to
#                               verify.
#                       NO_DEFAULT_CA
#                               Don't use the default CA list built in
#                               to OpenSSL.
#                       DONT_VERIFY_DOMAIN
#                               Don't verify the peer certificate
#                               matches the server name
#       
#       ssldomain=      The peer name as advertised in it's certificate.
#                       Used for verifying the correctness of the received peer
#                       certificate. If not specified the peer hostname will be
#                       used.
#       
#       front-end-https
#                       Enable the "Front-End-Https: On" header needed when
#                       using Squid as a SSL frontend in front of Microsoft OWA.
#                       See MS KB document Q307347 for details on this header.
#                       If set to auto the header will only be added if the
#                       request is forwarded as a https:// URL.
#       
#       
#       ==== GENERAL OPTIONS ====
#       
#       connect-timeout=N
#                       A peer-specific connect timeout.
#                       Also see the peer_connect_timeout directive.
#       
#       connect-fail-limit=N
#                       How many times connecting to a peer must fail before
#                       it is marked as down. Default is 10.
#       
#       allow-miss      Disable Squid's use of only-if-cached when forwarding
#                       requests to siblings. This is primarily useful when
#                       icp_hit_stale is used by the sibling. To extensive use
#                       of this option may result in forwarding loops, and you
#                       should avoid having two-way peerings with this option.
#                       For example to deny peer usage on requests from peer
#                       by denying cache_peer_access if the source is a peer.
#       
#       max-conn=N      Limit the amount of connections Squid may open to this
#                       peer. see also 
#       
#       name=xxx        Unique name for the peer.
#                       Required if you have multiple peers on the same host
#                       but different ports.
#                       This name can be used in cache_peer_access and similar
#                       directives to dentify the peer.
#                       Can be used by outgoing access controls through the
#                       peername ACL type.
#       
#       no-tproxy       Do not use the client-spoof TPROXY support when forwarding
#                       requests to this peer. Use normal address selection instead.
#       
#       proxy-only      objects fetched from the peer will not be stored locally.
#       
#Default:
# none

cache_peer 192.168.14.100 parent 8080 0 default no-query no-digest

#  TAG: cache_peer_domain
#       Use to limit the domains for which a neighbor cache will be
#       queried.  Usage:
#
#       cache_peer_domain cache-host domain [domain ...]
#       cache_peer_domain cache-host !domain
#
#       For example, specifying
#
#               cache_peer_domain parent.foo.net        .edu
#
#       has the effect such that UDP query packets are sent to
#       'bigserver' only when the requested object exists on a
#       server in the .edu domain.  Prefixing the domainname
#       with '!' means the cache will be queried for objects
#       NOT in that domain.
#
#       NOTE:   * Any number of domains may be given for a cache-host,
#                 either on the same or separate lines.
#               * When multiple domains are given for a particular
#                 cache-host, the first matched domain is applied.
#               * Cache hosts with no domain restrictions are queried
#                 for all requests.
#               * There are no defaults.
#               * There is also a 'cache_peer_access' tag in the ACL
#                 section.
#Default:
# none

cache_peer_domain 192.168.14.100 8080 !localnet

#  TAG: cache_peer_access
#       Similar to 'cache_peer_domain' but provides more flexibility by
#       using ACL elements.
#
#       cache_peer_access cache-host allow|deny [!]aclname ...
#
#       The syntax is identical to 'http_access' and the other lists of
#       ACL elements.  See the comments for 'http_access' below, or
#       the Squid FAQ (http://wiki.squid-cache.org/SquidFaq/SquidAcl).
#Default:
# none

#  TAG: neighbor_type_domain
#       usage: neighbor_type_domain neighbor parent|sibling domain domain ...
#
#       Modifying the neighbor type for specific domains is now
#       possible.  You can treat some domains differently than the the
#       default neighbor type specified on the 'cache_peer' line.
#       Normally it should only be necessary to list domains which
#       should be treated differently because the default neighbor type
#       applies for hostnames which do not match domains listed here.
#
#EXAMPLE:
#       cache_peer cache.foo.org parent 3128 3130
#       neighbor_type_domain cache.foo.org sibling .com .net
#       neighbor_type_domain cache.foo.org sibling .au .de
#Default:
# none

#  TAG: dead_peer_timeout       (seconds)
#       This controls how long Squid waits to declare a peer cache
#       as "dead."  If there are no ICP replies received in this
#       amount of time, Squid will declare the peer dead and not
#       expect to receive any further ICP replies.  However, it
#       continues to send ICP queries, and will mark the peer as
#       alive upon receipt of the first subsequent ICP reply.
#
#       This timeout also affects when Squid expects to receive ICP
#       replies from peers.  If more than 'dead_peer' seconds have
#       passed since the last ICP reply was received, Squid will not
#       expect to receive an ICP reply on the next query.  Thus, if
#       your time between requests is greater than this timeout, you
#       will see a lot of requests sent DIRECT to origin servers
#       instead of to your parents.
#Default:
# dead_peer_timeout 10 seconds

#  TAG: forward_max_tries
#       Controls how many different forward paths Squid will try
#       before giving up. See also forward_timeout.
#Default:
# forward_max_tries 10

#  TAG: hierarchy_stoplist
#       A list of words which, if found in a URL, cause the object to
#       be handled directly by this cache.  In other words, use this
#       to not query neighbor caches for certain objects.  You may
#       list this option multiple times.
#       Note: never_direct overrides this option.
#

# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?

# MEMORY CACHE OPTIONS
# -----------------------------------------------------------------------------

#  TAG: cache_mem       (bytes)
#       NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE.
#       IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL
#       USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER
#       THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS.
#
#       'cache_mem' specifies the ideal amount of memory to be used
#       for:
#               * In-Transit objects
#               * Hot Objects
#               * Negative-Cached objects
#
#       Data for these objects are stored in 4 KB blocks.  This
#       parameter specifies the ideal upper limit on the total size of
#       4 KB blocks allocated.  In-Transit objects take the highest
#       priority.
#
#       In-transit objects have priority over the others.  When
#       additional space is needed for incoming data, negative-cached
#       and hot objects will be released.  In other words, the
#       negative-cached and hot objects will fill up any unused space
#       not needed for in-transit objects.
#
#       If circumstances require, this limit will be exceeded.
#       Specifically, if your incoming request rate requires more than
#       'cache_mem' of memory to hold in-transit objects, Squid will
#       exceed this limit to satisfy the new requests.  When the load
#       decreases, blocks will be freed until the high-water mark is
#       reached.  Thereafter, blocks will be used to store hot
#       objects.
#Default:
# cache_mem 256 MB

#  TAG: maximum_object_size_in_memory   (bytes)
#       Objects greater than this size will not be attempted to kept in
#       the memory cache. This should be set high enough to keep objects
#       accessed frequently in memory to improve performance whilst low
#       enough to keep larger objects from hoarding cache_mem.
#Default:
# maximum_object_size_in_memory 512 KB

#  TAG: memory_replacement_policy
#       The memory replacement policy parameter determines which
#       objects are purged from memory when memory space is needed.
#
#       See cache_replacement_policy for details.
#Default:
# memory_replacement_policy lru

# DISK CACHE OPTIONS
# -----------------------------------------------------------------------------

#  TAG: cache_replacement_policy
#       The cache replacement policy parameter determines which
#       objects are evicted (replaced) when disk space is needed.
#
#           lru       : Squid's original list based LRU policy
#           heap GDSF : Greedy-Dual Size Frequency
#           heap LFUDA: Least Frequently Used with Dynamic Aging
#           heap LRU  : LRU policy implemented using a heap
#
#       Applies to any cache_dir lines listed below this.
#
#       The LRU policies keeps recently referenced objects.
#
#       The heap GDSF policy optimizes object hit rate by keeping smaller
#       popular objects in cache so it has a better chance of getting a
#       hit.  It achieves a lower byte hit rate than LFUDA though since
#       it evicts larger (possibly popular) objects.
#
#       The heap LFUDA policy keeps popular objects in cache regardless of
#       their size and thus optimizes byte hit rate at the expense of
#       hit rate since one large, popular object will prevent many
#       smaller, slightly less popular objects from being cached.
#
#       Both policies utilize a dynamic aging mechanism that prevents
#       cache pollution that can otherwise occur with frequency-based
#       replacement policies.
#
#       NOTE: if using the LFUDA replacement policy you should increase
#       the value of maximum_object_size above its default of 4096 KB to
#       to maximize the potential byte hit rate improvement of LFUDA.
#
#       For more information about the GDSF and LFUDA cache replacement
#       policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html
#       and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html.
#Default:
# cache_replacement_policy lru

#  TAG: cache_dir
#       Usage:
#
#       cache_dir Type Directory-Name Fs-specific-data [options]
#
#       You can specify multiple cache_dir lines to spread the
#       cache among different disk partitions.
#
#       Type specifies the kind of storage system to use. Only "ufs"
#       is built by default. To enable any of the other storage systems
#       see the --enable-storeio configure option.
#
#       'Directory' is a top-level directory where cache swap
#       files will be stored.  If you want to use an entire disk
#       for caching, this can be the mount-point directory.
#       The directory must exist and be writable by the Squid
#       process.  Squid will NOT create this directory for you.
#
#       The ufs store type:
#
#       "ufs" is the old well-known Squid storage format that has always
#       been there.
#
#       cache_dir ufs Directory-Name Mbytes L1 L2 [options]
#
#       'Mbytes' is the amount of disk space (MB) to use under this
#       directory.  The default is 100 MB.  Change this to suit your
#       configuration.  Do NOT put the size of your disk drive here.
#       Instead, if you want Squid to use the entire disk drive,
#       subtract 20% and use that value.
#
#       'Level-1' is the number of first-level subdirectories which
#       will be created under the 'Directory'.  The default is 16.
#
#       'Level-2' is the number of second-level subdirectories which
#       will be created under each first-level directory.  The default
#       is 256.
#
#       The aufs store type:
#
#       "aufs" uses the same storage format as "ufs", utilizing
#       POSIX-threads to avoid blocking the main Squid process on
#       disk-I/O. This was formerly known in Squid as async-io.
#
#       cache_dir aufs Directory-Name Mbytes L1 L2 [options]
#
#       see argument descriptions under ufs above
#
#       The diskd store type:
#
#       "diskd" uses the same storage format as "ufs", utilizing a
#       separate process to avoid blocking the main Squid process on
#       disk-I/O.
#
#       cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n]
#
#       see argument descriptions under ufs above
#
#       Q1 specifies the number of unacknowledged I/O requests when Squid
#       stops opening new files. If this many messages are in the queues,
#       Squid won't open new files. Default is 64
#
#       Q2 specifies the number of unacknowledged messages when Squid
#       starts blocking.  If this many messages are in the queues,
#       Squid blocks until it receives some replies. Default is 72
#
#       When Q1 < Q2 (the default), the cache directory is optimized
#       for lower response time at the expense of a decrease in hit
#       ratio.  If Q1 > Q2, the cache directory is optimized for
#       higher hit ratio at the expense of an increase in response
#       time.
#
#       The coss store type:
#
#       NP: COSS filesystem in Squid-3 has been deemed too unstable for
#           production use and has thus been removed from this release.
#           We hope that it can be made usable again soon.
#
#       block-size=n defines the "block size" for COSS cache_dir's.
#       Squid uses file numbers as block numbers.  Since file numbers
#       are limited to 24 bits, the block size determines the maximum
#       size of the COSS partition.  The default is 512 bytes, which
#       leads to a maximum cache_dir size of 512<<24, or 8 GB.  Note
#       you should not change the coss block size after Squid
#       has written some objects to the cache_dir.
#
#       The coss file store has changed from 2.5. Now it uses a file
#       called 'stripe' in the directory names in the config - and
#       this will be created by squid -z.
#
#       Common options:
#
#       no-store, no new objects should be stored to this cache_dir
#
#       max-size=n, refers to the max object size this storedir supports.
#       It is used to initially choose the storedir to dump the object.
#       Note: To make optimal use of the max-size limits you should order
#       the cache_dir lines with the smallest max-size value first and the
#       ones with no max-size specification last.
#
#       Note for coss, max-size must be less than COSS_MEMBUF_SZ,
#       which can be changed with the --with-coss-membuf-size=N configure
#       option.
#

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid3 100 16 256

#  TAG: store_dir_select_algorithm
#       Set this to 'round-robin' as an alternative.
#Default:
# store_dir_select_algorithm least-load

#  TAG: max_open_disk_fds
#       To avoid having disk as the I/O bottleneck Squid can optionally
#       bypass the on-disk cache if more than this amount of disk file
#       descriptors are open.
#
#       A value of 0 indicates no limit.
#Default:
# max_open_disk_fds 0

#  TAG: minimum_object_size     (bytes)
#       Objects smaller than this size will NOT be saved on disk.  The
#       value is specified in kilobytes, and the default is 0 KB, which
#       means there is no minimum.
#Default:
# minimum_object_size 0 KB

#  TAG: maximum_object_size     (bytes)
#       Objects larger than this size will NOT be saved on disk.  The
#       value is specified in kilobytes, and the default is 4MB.  If
#       you wish to get a high BYTES hit ratio, you should probably
#       increase this (one 32 MB object hit counts for 3200 10KB
#       hits).  If you wish to increase speed more than your want to
#       save bandwidth you should leave this low.
#
#       NOTE: if using the LFUDA replacement policy you should increase
#       this value to maximize the byte hit rate improvement of LFUDA!
#       See replacement_policy below for a discussion of this policy.
#Default:
# maximum_object_size 4096 KB

# Videos are LARGE; make sure you aren't killing them as 'too big to save'
# - squid defaults to 4MB, which is too small for videos and even some sound files
# See: http://sigtar.com/2009/06/10/squid-optimizing-cache-hits/
maximum_object_size 4 GB

#  TAG: cache_swap_low  (percent, 0-100)
#  TAG: cache_swap_high (percent, 0-100)
#
#       The low- and high-water marks for cache object replacement.
#       Replacement begins when the swap (disk) usage is above the
#       low-water mark and attempts to maintain utilization near the
#       low-water mark.  As swap utilization gets close to high-water
#       mark object eviction becomes more aggressive.  If utilization is
#       close to the low-water mark less replacement is done each time.
#
#       Defaults are 90% and 95%. If you have a large cache, 5% could be
#       hundreds of MB. If this is the case you may wish to set these
#       numbers closer together.
#Default:
# cache_swap_low 90
# cache_swap_high 95

# LOGFILE OPTIONS
# -----------------------------------------------------------------------------

#  TAG: logformat
#       Usage:
#
#       logformat <name> <format specification>
#
#       Defines an access log format.
#
#       The <format specification> is a string with embedded % format codes
#
#       % format codes all follow the same basic structure where all but
#       the formatcode is optional. Output strings are automatically escaped
#       as required according to their context and the output format
#       modifiers are usually not needed, but can be specified if an explicit
#       output format is desired.
#
#               % ["|[|'|#] [-] [[0]width] [{argument}] formatcode
#
#               "       output in quoted string format
#               [       output in squid text log format as used by log_mime_hdrs
#               #       output in URL quoted format
#               '       output as-is
#
#               -       left aligned
#               width   field width. If starting with 0 the
#                       output is zero padded
#               {arg}   argument such as header name etc
#
#       Format codes:
#
#               %       a literal % character
#               >a      Client source IP address
#               >A      Client FQDN
#               >p      Client source port
#               <A      Server IP address or peer name
#               la      Local IP address (http_port)
#               lp      Local port number (http_port)
#               ts      Seconds since epoch
#               tu      subsecond time (milliseconds)
#               tl      Local time. Optional strftime format argument
#                               default %d/%b/%Y:%H:%M:%S %z
#               tg      GMT time. Optional strftime format argument
#                               default %d/%b/%Y:%H:%M:%S %z
#               tr      Response time (milliseconds)
#               dt      Total time spent making DNS lookups (milliseconds)
#
#       HTTP cache related format codes:
#
#               [http::]>h      Original request header. Optional header name argument
#                               on the format header[:[separator]element]
#               [http::]>ha     The HTTP request headers after adaptation and redirection. 
#                               Optional header name argument as for >h
#               [http::]<h      Reply header. Optional header name argument
#                               as for >h
#               [http::]un      User name
#               [http::]ul      User name from authentication
#               [http::]ui      User name from ident
#               [http::]us      User name from SSL
#               [http::]ue      User name from external acl helper
#               [http::]>Hs     HTTP status code sent to the client
#               [http::]<Hs     HTTP status code received from the next hop
#               [http::]Ss      Squid request status (TCP_MISS etc)
#               [http::]Sh      Squid hierarchy status (DEFAULT_PARENT etc)
#               [http::]mt      MIME content type
#               [http::]rm      Request method (GET/POST etc)
#               [http::]ru      Request URL
#               [http::]rp      Request URL-Path excluding hostname
#               [http::]rv      Request protocol version
#               [http::]et      Tag returned by external acl
#               [http::]ea      Log string returned by external acl
#               [http::]<st     Sent reply size including HTTP headers
#               [http::]>st     Received request size including HTTP headers. In the
#                               case of chunked requests the chunked encoding metadata
#                               are not included
#               [http::]>sh     Received HTTP request headers size
#               [http::]<sh     Sent HTTP reply headers size
#               [http::]st      Request+Reply size including HTTP headers
#               [http::]<sH     Reply high offset sent
#               [http::]<sS     Upstream object size
#               [http::]<pt     Peer response time in milliseconds. The timer starts
#                               when the last request byte is sent to the next hop
#                               and stops when the last response byte is received.
#               [http::]<tt     Total server-side time in milliseconds. The timer 
#                               starts with the first connect request (or write I/O)
#                               sent to the first selected peer. The timer stops
#                               with the last I/O with the last peer.
#
#       If ICAP is enabled, the following two codes become available (as
#       well as ICAP log codes documented with the icap_log option):
#
#               icap::tt        Total ICAP processing time for the HTTP
#                               transaction. The timer ticks when ICAP
#                               ACLs are checked and when ICAP
#                               transaction is in progress.
#
#               icap::<last_h   The header of the last ICAP response
#                               related to the HTTP transaction. Like
#                               <h, accepts an optional header name
#                               argument.  Will not change semantics
#                               when multiple ICAP transactions per HTTP
#                               transaction are supported.
#
#       If adaptation is enabled the following two codes become available:
#
#               adapt::sum_trs Summed adaptation transaction response
#                               times recorded as a comma-separated list in
#                               the order of transaction start time. Each time
#                               value is recorded as an integer number,
#                               representing response time of one or more
#                               adaptation (ICAP or eCAP) transaction in
#                               milliseconds.  When a failed transaction is
#                               being retried or repeated, its time is not
#                               logged individually but added to the
#                               replacement (next) transaction. See also:
#                               adapt::all_trs.
#
#               adapt::all_trs All adaptation transaction response times.
#                               Same as adaptation_strs but response times of
#                               individual transactions are never added
#                               together. Instead, all transaction response
#                               times are recorded individually.
#
#       You can prefix adapt::*_trs format codes with adaptation
#       service name in curly braces to record response time(s) specific
#       to that service. For example: %{my_service}adapt::sum_trs
#
#       The default formats available (which do not need re-defining) are:
#
#logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt
#logformat squidmime %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h]
#logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh
#logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
#Default:
# none

#  TAG: access_log
#       These files log client request activities. Has a line every HTTP or
#       ICP request. The format is:
#       access_log <filepath> [<logformat name> [acl acl ...]]
#       access_log none [acl acl ...]]
#
#       Will log to the specified file using the specified format (which
#       must be defined in a logformat directive) those entries which match
#       ALL the acl's specified (which must be defined in acl clauses).
#       If no acl is specified, all requests will be logged to this file.
#
#       To disable logging of a request use the filepath "none", in which case
#       a logformat name should not be specified.
#
#       To log the request via syslog specify a filepath of "syslog":
#
#       access_log syslog[:facility.priority] [format [acl1 [acl2 ....]]]
#       where facility could be any of:
#       authpriv, daemon, local0 .. local7 or user.
#
#       And priority could be any of:
#       err, warning, notice, info, debug.
#
#       Default:
#               access_log /var/log/squid3/access.log squid
#Default:
# access_log /var/log/squid3/access.log squid

#  TAG: icap_log
#       ICAP log files record ICAP transaction summaries, one line per
#       transaction.
#
#       The icap_log option format is:
#       icap_log <filepath> [<logformat name> [acl acl ...]]
#       icap_log none [acl acl ...]]
#       
#       Please see access_log option documentation for details. The two
#       kinds of logs share the overall configuration approach and many
#       features.
#
#       ICAP processing of a single HTTP message or transaction may
#       require multiple ICAP transactions.  In such cases, multiple
#       ICAP transaction log lines will correspond to a single access
#       log line.
#
#       ICAP log uses logformat codes that make sense for an ICAP
#       transaction. Header-related codes are applied to the HTTP header
#       embedded in an ICAP server response, with the following caveats:
#       For REQMOD, there is no HTTP response header unless the ICAP
#       server performed request satisfaction. For RESPMOD, the HTTP
#       request header is the header sent to the ICAP server. For
#       OPTIONS, there are no HTTP headers.
#
#       The following format codes are also available for ICAP logs:
#
#               icap::<A        ICAP server IP address. Similar to <A.
#
#               icap::<service_name     ICAP service name from the icap_service
#                               option in Squid configuration file.
#
#               icap::ru        ICAP Request-URI. Similar to ru.
#
#               icap::rm        ICAP request method (REQMOD, RESPMOD, or 
#                               OPTIONS). Similar to existing rm.
#
#               icap::>st       Bytes sent to the ICAP server (TCP payload
#                               only; i.e., what Squid writes to the socket).
#
#               icap::<st       Bytes received from the ICAP server (TCP
#                               payload only; i.e., what Squid reads from
#                               the socket).
#
#               icap::tr        Transaction response time (in
#                               milliseconds).  The timer starts when
#                               the ICAP transaction is created and
#                               stops when the transaction is completed.
#                               Similar to tr.
#
#               icap::tio       Transaction I/O time (in milliseconds). The
#                               timer starts when the first ICAP request
#                               byte is scheduled for sending. The timers
#                               stops when the last byte of the ICAP response
#                               is received.
#
#               icap::to        Transaction outcome: ICAP_ERR* for all
#                               transaction errors, ICAP_OPT for OPTION
#                               transactions, ICAP_ECHO for 204
#                               responses, ICAP_MOD for message
#                               modification, and ICAP_SAT for request
#                               satisfaction. Similar to Ss.
#
#               icap::Hs        ICAP response status code. Similar to Hs.
#
#               icap::>h        ICAP request header(s). Similar to >h.
#
#               icap::<h        ICAP response header(s). Similar to <h.
#
#       The default ICAP log format, which can be used without an explicit
#       definition, is called icap_squid:
#
#logformat icap_squid %ts.%03tu %6icap::tr %>a %icap::to/%03icap::Hs %icap::<size %icap::rm %icap::ru% %un -/%icap::<A -
#
#       See also: logformat, log_icap, and %icap::<last_h 
#Default:
# none

#  TAG: log_access      allow|deny acl acl...
#       This options allows you to control which requests gets logged
#       to access.log (see access_log directive). Requests denied for
#       logging will also not be accounted for in performance counters.
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# none

#  TAG: log_icap
#       This options allows you to control which requests get logged
#       to icap.log. See the icap_log directive for ICAP log details.
#Default:
# none

#  TAG: cache_store_log
#       Logs the activities of the storage manager.  Shows which
#       objects are ejected from the cache, and which objects are
#       saved and for how long.  To disable, enter "none" or remove the line.
#       There are not really utilities to analyze this data, so you can safely
#       disable it.
#
#       Example:
#               cache_store_log /var/log/squid3/store.log
#Default:
# none

#  TAG: cache_swap_state
#       Location for the cache "swap.state" file. This index file holds
#       the metadata of objects saved on disk.  It is used to rebuild
#       the cache during startup.  Normally this file resides in each
#       'cache_dir' directory, but you may specify an alternate
#       pathname here.  Note you must give a full filename, not just
#       a directory. Since this is the index for the whole object
#       list you CANNOT periodically rotate it!
#
#       If %s can be used in the file name it will be replaced with a
#       a representation of the cache_dir name where each / is replaced
#       with '.'. This is needed to allow adding/removing cache_dir
#       lines when cache_swap_log is being used.
#
#       If have more than one 'cache_dir', and %s is not used in the name
#       these swap logs will have names such as:
#
#               cache_swap_log.00
#               cache_swap_log.01
#               cache_swap_log.02
#
#       The numbered extension (which is added automatically)
#       corresponds to the order of the 'cache_dir' lines in this
#       configuration file.  If you change the order of the 'cache_dir'
#       lines in this file, these index files will NOT correspond to
#       the correct 'cache_dir' entry (unless you manually rename
#       them).  We recommend you do NOT use this option.  It is
#       better to keep these index files in each 'cache_dir' directory.
#Default:
# none

#  TAG: logfile_rotate
#       Specifies the number of logfile rotations to make when you
#       type 'squid -k rotate'. The default is 10, which will rotate
#       with extensions 0 through 9. Setting logfile_rotate to 0 will
#       disable the file name rotation, but the logfiles are still closed
#       and re-opened. This will enable you to rename the logfiles
#       yourself just before sending the rotate signal.
#
#       Note, the 'squid -k rotate' command normally sends a USR1
#       signal to the running squid process.  In certain situations
#       (e.g. on Linux with Async I/O), USR1 is used for other
#       purposes, so -k rotate uses another signal.  It is best to get
#       in the habit of using 'squid -k rotate' instead of 'kill -USR1
#       <pid>'.
#
#       Note, from Squid-3.1 this option has no effect on the cache.log,
#       that log can be rotated separately by using debug_options
#
#       Note2, for Debian/Linux the default of logfile_rotate is
#       zero, since it includes external logfile-rotation methods.
#Default:
# logfile_rotate 0

#  TAG: emulate_httpd_log       on|off
#       The Cache can emulate the log file format which many 'httpd'
#       programs use.  To disable/enable this emulation, set
#       emulate_httpd_log to 'off' or 'on'.  The default
#       is to use the native log format since it includes useful
#       information Squid-specific log analyzers use.
#Default:
# emulate_httpd_log off

#  TAG: log_ip_on_direct        on|off
#       Log the destination IP address in the hierarchy log tag when going
#       direct. Earlier Squid versions logged the hostname here. If you
#       prefer the old way set this to off.
#Default:
# log_ip_on_direct on

#  TAG: mime_table
#       Pathname to Squid's MIME table. You shouldn't need to change
#       this, but the default file contains examples and formatting
#       information if you do.
#Default:
# mime_table /usr/share/squid3/mime.conf

#  TAG: log_mime_hdrs   on|off
#       The Cache can record both the request and the response MIME
#       headers for each HTTP transaction.  The headers are encoded
#       safely and will appear as two bracketed fields at the end of
#       the access log (for either the native or httpd-emulated log
#       formats).  To enable this logging set log_mime_hdrs to 'on'.
#Default:
# log_mime_hdrs off

#  TAG: useragent_log
# Note: This option is only available if Squid is rebuilt with the
#       --enable-useragent-log option
#
#       Squid will write the User-Agent field from HTTP requests
#       to the filename specified here.  By default useragent_log
#       is disabled.
#Default:
# none

#  TAG: referer_log
# Note: This option is only available if Squid is rebuilt with the
#       --enable-referer-log option
#
#       Squid will write the Referer field from HTTP requests to the
#       filename specified here.  By default referer_log is disabled.
#       Note that "referer" is actually a misspelling of "referrer"
#       however the misspelt version has been accepted into the HTTP RFCs
#       and we accept both.
#Default:
# none

#  TAG: pid_filename
#       A filename to write the process-id to.  To disable, enter "none".
#Default:
# pid_filename /var/run/squid3.pid

#  TAG: log_fqdn        on|off
#       Turn this on if you wish to log fully qualified domain names
#       in the access.log. To do this Squid does a DNS lookup of all
#       IP's connecting to it. This can (in some situations) increase
#       latency, which makes your cache seem slower for interactive
#       browsing.
#Default:
# log_fqdn off

#  TAG: client_netmask
#       A netmask for client addresses in logfiles and cachemgr output.
#       Change this to protect the privacy of your cache clients.
#       A netmask of 255.255.255.0 will log all IP's in that range with
#       the last digit set to '0'.
#Default:
# client_netmask no_addr

#  TAG: forward_log
# Note: This option is only available if Squid is rebuilt with the
#       -DWIP_FWD_LOG define
#
#       Logs the server-side requests.
#
#       This is currently work in progress.
#Default:
# none

#  TAG: strip_query_terms
#       By default, Squid strips query terms from requested URLs before
#       logging.  This protects your user's privacy.
#Default:
# strip_query_terms on

#  TAG: buffered_logs   on|off
#       cache.log log file is written with stdio functions, and as such
#       it can be buffered or unbuffered. By default it will be unbuffered.
#       Buffering it can speed up the writing slightly (though you are
#       unlikely to need to worry unless you run with tons of debugging
#       enabled in which case performance will suffer badly anyway..).
#Default:
# buffered_logs off

#  TAG: netdb_filename
# Note: This option is only available if Squid is rebuilt with the
#       --enable-icmp option
#
#       A filename where Squid stores it's netdb state between restarts.
#       To disable, enter "none".
#Default:
# netdb_filename /var/log/squid3/netdb.state

# OPTIONS FOR TROUBLESHOOTING
# -----------------------------------------------------------------------------

#  TAG: cache_log
#       Cache logging file. This is where general information about
#       your cache's behavior goes. You can increase the amount of data
#       logged to this file and how often its rotated with "debug_options"
#Default:
# cache_log /var/log/squid3/cache.log

#  TAG: debug_options
#       Logging options are set as section,level where each source file
#       is assigned a unique section.  Lower levels result in less
#       output,  Full debugging (level 9) can result in a very large
#       log file, so be careful.
#
#       The magic word "ALL" sets debugging levels for all sections.
#       We recommend normally running with "ALL,1".
#
#       The rotate=N option can be used to keep more or less of these logs
#       than would otherwise be kept by logfile_rotate.
#       For most uses a single log should be enough to monitor current
#       events affecting Squid.
#Default:
# debug_options ALL,1

#  TAG: coredump_dir
#       By default Squid leaves core files in the directory from where
#       it was started. If you set 'coredump_dir' to a directory
#       that exists, Squid will chdir() to that directory at startup
#       and coredump files will be left there.
#
#Default:
# coredump_dir none
#

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid3

# OPTIONS FOR FTP GATEWAYING
# -----------------------------------------------------------------------------

#  TAG: ftp_user
#       If you want the anonymous login password to be more informative
#       (and enable the use of picky ftp servers), set this to something
#       reasonable for your domain, like wwwuser@somewhere.net
#
#       The reason why this is domainless by default is the
#       request can be made on the behalf of a user in any domain,
#       depending on how the cache is used.
#       Some ftp server also validate the email address is valid
#       (for example perl.com).
#Default:
# ftp_user Squid@

#  TAG: ftp_list_width
#       Sets the width of ftp listings. This should be set to fit in
#       the width of a standard browser. Setting this too small
#       can cut off long filenames when browsing ftp sites.
#Default:
# ftp_list_width 32

#  TAG: ftp_passive
#       If your firewall does not allow Squid to use passive
#       connections, turn off this option.
#
#       Use of ftp_epsv_all option requires this to be ON.
#Default:
# ftp_passive on

#  TAG: ftp_epsv_all
#       FTP Protocol extensions permit the use of a special "EPSV ALL" command.
#
#       NATs may be able to put the connection on a "fast path" through the
#       translator, as the EPRT command will never be used and therefore,
#       translation of the data portion of the segments will never be needed.
#
#       When a client only expects to do two-way FTP transfers this may be
#       useful.
#       If squid finds that it must do a three-way FTP transfer after issuing
#       an EPSV ALL command, the FTP session will fail.
#
#       If you have any doubts about this option do not use it.
#       Squid will nicely attempt all other connection methods.
#
#       Requires ftp_passive to be ON (default) for any effect.
#Default:
# ftp_epsv_all off

#  TAG: ftp_epsv
#       FTP Protocol extensions permit the use of a special "EPSV" command.
#
#       NATs may be able to put the connection on a "fast path" through the
#       translator using EPSV, as the EPRT command will never be used
#       and therefore, translation of the data portion of the segments 
#       will never be needed.
#
#       Turning this OFF will prevent EPSV being attempted.
#       WARNING: Doing so will convert Squid back to the old behavior with all
#       the related problems with external NAT devices/layers.
#
#       Requires ftp_passive to be ON (default) for any effect.
#Default:
# ftp_epsv on

#  TAG: ftp_sanitycheck
#       For security and data integrity reasons Squid by default performs
#       sanity checks of the addresses of FTP data connections ensure the
#       data connection is to the requested server. If you need to allow
#       FTP connections to servers using another IP address for the data
#       connection turn this off.
#Default:
# ftp_sanitycheck on

#  TAG: ftp_telnet_protocol
#       The FTP protocol is officially defined to use the telnet protocol
#       as transport channel for the control connection. However, many
#       implementations are broken and does not respect this aspect of
#       the FTP protocol.
#
#       If you have trouble accessing files with ASCII code 255 in the
#       path or similar problems involving this ASCII code you can
#       try setting this directive to off. If that helps, report to the
#       operator of the FTP server in question that their FTP server
#       is broken and does not follow the FTP standard.
#Default:
# ftp_telnet_protocol on

# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
# -----------------------------------------------------------------------------

#  TAG: diskd_program
#       Specify the location of the diskd executable.
#       Note this is only useful if you have compiled in
#       diskd as one of the store io modules.
#Default:
# diskd_program /usr/lib/squid3/diskd

#  TAG: unlinkd_program
#       Specify the location of the executable for file deletion process.
#Default:
# unlinkd_program /usr/lib/squid3/unlinkd

#  TAG: pinger_program
# Note: This option is only available if Squid is rebuilt with the
#       --enable-icmp option
#
#       Specify the location of the executable for the pinger process.
#Default:
# pinger_program /usr/lib/squid3/pinger

#  TAG: pinger_enable
# Note: This option is only available if Squid is rebuilt with the
#       --enable-icmp option
#
#       Control whether the pinger is active at run-time.
#       Enables turning ICMP pinger on and off with a simple
#       squid -k reconfigure.
#Default:
# pinger_enable off

# OPTIONS FOR URL REWRITING
# -----------------------------------------------------------------------------

#  TAG: url_rewrite_program
#       Specify the location of the executable for the URL rewriter.
#       Since they can perform almost any function there isn't one included.
#
#       For each requested URL rewriter will receive on line with the format
#
#       URL <SP> client_ip "/" fqdn <SP> user <SP> method [<SP> kvpairs]<NL>
#
#       In the future, the rewriter interface will be extended with
#       key=value pairs ("kvpairs" shown above).  Rewriter programs
#       should be prepared to receive and possibly ignore additional
#       whitespace-separated tokens on each input line.
#
#       And the rewriter may return a rewritten URL. The other components of
#       the request line does not need to be returned (ignored if they are).
#
#       The rewriter can also indicate that a client-side redirect should
#       be performed to the new URL. This is done by prefixing the returned
#       URL with "301:" (moved permanently) or 302: (moved temporarily).
#
#       By default, a URL rewriter is not used.
#Default:
# none

#  TAG: url_rewrite_children
#       The number of redirector processes to spawn. If you start
#       too few Squid will have to wait for them to process a backlog of
#       URLs, slowing it down. If you start too many they will use RAM
#       and other system resources.
#Default:
# url_rewrite_children 5

#  TAG: url_rewrite_concurrency
#       The number of requests each redirector helper can handle in
#       parallel. Defaults to 0 which indicates the redirector
#       is a old-style single threaded redirector.
#
#       When this directive is set to a value >= 1 then the protocol
#       used to communicate with the helper is modified to include
#       a request ID in front of the request/response. The request
#       ID from the request must be echoed back with the response
#       to that request.
#Default:
# url_rewrite_concurrency 0

#  TAG: url_rewrite_host_header
#       By default Squid rewrites any Host: header in redirected
#       requests.  If you are running an accelerator this may
#       not be a wanted effect of a redirector.
#
#       WARNING: Entries are cached on the result of the URL rewriting
#       process, so be careful if you have domain-virtual hosts.
#Default:
# url_rewrite_host_header on

#  TAG: url_rewrite_access
#       If defined, this access list specifies which requests are
#       sent to the redirector processes.  By default all requests
#       are sent.
#
#       This clause supports both fast and slow acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# none

#  TAG: url_rewrite_bypass
#       When this is 'on', a request will not go through the
#       redirector if all redirectors are busy.  If this is 'off'
#       and the redirector queue grows too large, Squid will exit
#       with a FATAL error and ask you to increase the number of
#       redirectors.  You should only enable this if the redirectors
#       are not critical to your caching system.  If you use
#       redirectors for access control, and you enable this option,
#       users may have access to pages they should not
#       be allowed to request.
#Default:
# url_rewrite_bypass off

# OPTIONS FOR TUNING THE CACHE
# -----------------------------------------------------------------------------

#  TAG: cache
#       A list of ACL elements which, if matched and denied, cause the request to
#       not be satisfied from the cache and the reply to not be cached.
#       In other words, use this to force certain objects to never be cached.
#
#       You must use the words 'allow' or 'deny' to indicate whether items
#       matching the ACL should be allowed or denied into the cache.
#
#       Default is to allow all to be cached.
#
#       This clause supports both fast and slow acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# none

#  TAG: refresh_pattern
#       usage: refresh_pattern [-i] regex min percent max [options]
#
#       By default, regular expressions are CASE-SENSITIVE.  To make
#       them case-insensitive, use the -i option.
#
#       'Min' is the time (in minutes) an object without an explicit
#       expiry time should be considered fresh. The recommended
#       value is 0, any higher values may cause dynamic applications
#       to be erroneously cached unless the application designer
#       has taken the appropriate actions.
#
#       'Percent' is a percentage of the objects age (time since last
#       modification age) an object without explicit expiry time
#       will be considered fresh.
#
#       'Max' is an upper limit on how long objects without an explicit
#       expiry time will be considered fresh.
#
#       options: override-expire
#                override-lastmod
#                reload-into-ims
#                ignore-reload
#                ignore-no-cache
#                ignore-no-store
#                ignore-must-revalidate
#                ignore-private
#                ignore-auth
#                refresh-ims
#
#               override-expire enforces min age even if the server
#               sent an explicit expiry time (e.g., with the
#               Expires: header or Cache-Control: max-age). Doing this
#               VIOLATES the HTTP standard.  Enabling this feature
#               could make you liable for problems which it causes.
#
#               Note: override-expire does not enforce staleness - it only extends
#               freshness / min. If the server returns a Expires time which
#               is longer than your max time, Squid will still consider
#               the object fresh for that period of time.
#
#               override-lastmod enforces min age even on objects
#               that were modified recently.
#
#               reload-into-ims changes client no-cache or ``reload''
#               to If-Modified-Since requests. Doing this VIOLATES the
#               HTTP standard. Enabling this feature could make you
#               liable for problems which it causes.
#
#               ignore-reload ignores a client no-cache or ``reload''
#               header. Doing this VIOLATES the HTTP standard. Enabling
#               this feature could make you liable for problems which
#               it causes.
#
#               ignore-no-cache ignores any ``Pragma: no-cache'' and
#               ``Cache-control: no-cache'' headers received from a server.
#               The HTTP RFC never allows the use of this (Pragma) header
#               from a server, only a client, though plenty of servers
#               send it anyway.
#
#               ignore-no-store ignores any ``Cache-control: no-store''
#               headers received from a server. Doing this VIOLATES
#               the HTTP standard. Enabling this feature could make you
#               liable for problems which it causes.
#
#               ignore-must-revalidate ignores any ``Cache-Control: must-revalidate``
#               headers received from a server. Doing this VIOLATES
#               the HTTP standard. Enabling this feature could make you
#               liable for problems which it causes.
#
#               ignore-private ignores any ``Cache-control: private''
#               headers received from a server. Doing this VIOLATES
#               the HTTP standard. Enabling this feature could make you
#               liable for problems which it causes.
#
#               ignore-auth caches responses to requests with authorization,
#               as if the originserver had sent ``Cache-control: public''
#               in the response header. Doing this VIOLATES the HTTP standard.
#               Enabling this feature could make you liable for problems which
#               it causes.
#
#               refresh-ims causes squid to contact the origin server
#               when a client issues an If-Modified-Since request. This
#               ensures that the client will receive an updated version
#               if one is available.
#
#       Basically a cached object is:
#
#               FRESH if expires < now, else STALE
#               STALE if age > max
#               FRESH if lm-factor < percent, else STALE
#               FRESH if age < min
#               else STALE
#
#       The refresh_pattern lines are checked in the order listed here.
#       The first entry which matches is used.  If none of the entries
#       match the default will be used.
#
#       Note, you must uncomment all the default lines if you want
#       to change one. The default setting is only active if none is
#       used.
#
#

# Add any of your own refresh_pattern entries above these.
#refresh_pattern ^ftp:          1440    20%     10080
#refresh_pattern ^gopher:       1440    0%      1440
#refresh_pattern -i (/cgi-bin/|\?) 0    0%      0
#refresh_pattern .              0       20%     4320

# Refresh patterns are of the format: refresh_pattern [-i] regex min percent max [options]
# where min and max are time values in minutes and percent is a percentage figure. The options are:
#     override-expire -- ignores the expire header from the Web server.
#     override-lastmod -- ignores the last modified date header from the Web server.
#     reload-into-ims -- a reload request from a client is converted into an If-Modified-Since request.
#     ignore-reload -- a client's no-cache or "reload from origin server" directive is ignored. The request can therefore be satisfied from the cache if available.
#     ignore-no-cache -- a no-cache directive from the Web server which makes an object non-cacheable is ignored.
#     ignore-no-store -- a no-store directive from the Web server which makes an object non-cacheable is ignored.
#     ignore-private -- a private directive from the Web server which makes an object non-cacheable is ignored.
#     ignore-auth -- objects requiring authorisation are non-cacheable. This option overrides this limitation.
#     refresh-ims -- a refresh request from a client is converted into an If-Modified-Since request.
# See: http://archive09.linux.com/feature/153221 and http://sigtar.com/2009/06/10/squid-optimizing-cache-hits/

refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i \.(gif|png|jpg|jpeg|ico)$ 10080 90% 43200 override-expire ignore-no-cache ignore-no-store ignore-private
refresh_pattern -i \.(iso|avi|wav|mp3|mp4|mpeg|swf|flv|x-flv)$ 43200 90% 432000 override-expire ignore-no-cache ignore-no-store ignore-private
refresh_pattern -i \.(deb|rpm|exe|zip|tar|tgz|ram|rar|bin|ppt|doc|tiff)$ 10080 90% 43200 override-expire ignore-no-cache ignore-no-store ignore-private
refresh_pattern -i \.index.(html|htm)$ 0 40% 10080
refresh_pattern -i \.(html|htm|css|js)$ 1440 40% 40320
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern . 0 40% 40320

refresh_pattern -i youtube.com/.* 10080 90% 43200

#  TAG: quick_abort_min (KB)
#  TAG: quick_abort_max (KB)
#  TAG: quick_abort_pct (percent)
#       The cache by default continues downloading aborted requests
#       which are almost completed (less than 16 KB remaining). This
#       may be undesirable on slow (e.g. SLIP) links and/or very busy
#       caches.  Impatient users may tie up file descriptors and
#       bandwidth by repeatedly requesting and immediately aborting
#       downloads.
#
#       When the user aborts a request, Squid will check the
#       quick_abort values to the amount of data transfered until
#       then.
#
#       If the transfer has less than 'quick_abort_min' KB remaining,
#       it will finish the retrieval.
#
#       If the transfer has more than 'quick_abort_max' KB remaining,
#       it will abort the retrieval.
#
#       If more than 'quick_abort_pct' of the transfer has completed,
#       it will finish the retrieval.
#
#       If you do not want any retrieval to continue after the client
#       has aborted, set both 'quick_abort_min' and 'quick_abort_max'
#       to '0 KB'.
#
#       If you want retrievals to always continue if they are being
#       cached set 'quick_abort_min' to '-1 KB'.
#Default:
# quick_abort_min 16 KB
# quick_abort_max 16 KB
# quick_abort_pct 95

# Apparently youtube.com use 'Range' requests
# - not seen, but presumably when a video is stopped for a long while then resumed, (or fast-forwarded).
# - convert range requests into a full-file request, so squid can cache it
# NP: BUT slows down their _first_ load time.
# See: http://sigtar.com/2009/06/10/squid-optimizing-cache-hits/
#quick_abort_min -1 KB

#  TAG: read_ahead_gap  buffer-size
#       The amount of data the cache will buffer ahead of what has been
#       sent to the client when retrieving an object from another server.
#Default:
# read_ahead_gap 16 KB

#  TAG: negative_ttl    time-units
#       Set the Default Time-to-Live (TTL) for failed requests.
#       Certain types of failures (such as "connection refused" and
#       "404 Not Found") are able to be negatively-cached for a short time.
#       Modern web servers should provide Expires: header, however if they
#       do not this can provide a minimum TTL.
#       The default is not to cache errors with unknown expiry details.
#
#       Note that this is different from negative caching of DNS lookups.
#
#       WARNING: Doing this VIOLATES the HTTP standard.  Enabling
#       this feature could make you liable for problems which it
#       causes.
#Default:
# negative_ttl 0 seconds

#  TAG: positive_dns_ttl        time-units
#       Upper limit on how long Squid will cache positive DNS responses.
#       Default is 6 hours (360 minutes). This directive must be set
#       larger than negative_dns_ttl.
#Default:
# positive_dns_ttl 6 hours

#  TAG: negative_dns_ttl        time-units
#       Time-to-Live (TTL) for negative caching of failed DNS lookups.
#       This also sets the lower cache limit on positive lookups.
#       Minimum value is 1 second, and it is not recommendable to go
#       much below 10 seconds.
#Default:
# negative_dns_ttl 1 minutes

#  TAG: range_offset_limit      (bytes)
#       Sets a upper limit on how far into the the file a Range request
#       may be to cause Squid to prefetch the whole file. If beyond this
#       limit Squid forwards the Range request as it is and the result
#       is NOT cached.
#
#       This is to stop a far ahead range request (lets say start at 17MB)
#       from making Squid fetch the whole object up to that point before
#       sending anything to the client.
#
#       A value of 0 causes Squid to never fetch more than the
#       client requested. (default)
#
#       A value of -1 causes Squid to always fetch the object from the
#       beginning so it may cache the result. (2.0 style)
#
#       NP: Using -1 here will override any quick_abort settings that may
#           otherwise apply to the range request. The range request will
#           be fully fetched from start to finish regardless of the client
#           actions. This affects bandwidth usage.
#Default:
# range_offset_limit 0 KB

#  TAG: minimum_expiry_time     (seconds)
#       The minimum caching time according to (Expires - Date)
#       Headers Squid honors if the object can't be revalidated
#       defaults to 60 seconds. In reverse proxy environments it
#       might be desirable to honor shorter object lifetimes. It
#       is most likely better to make your server return a
#       meaningful Last-Modified header however. In ESI environments
#       where page fragments often have short lifetimes, this will
#       often be best set to 0.
#Default:
# minimum_expiry_time 60 seconds

#  TAG: store_avg_object_size   (kbytes)
#       Average object size, used to estimate number of objects your
#       cache can hold.  The default is 13 KB.
#Default:
# store_avg_object_size 13 KB

#  TAG: store_objects_per_bucket
#       Target number of objects per bucket in the store hash table.
#       Lowering this value increases the total number of buckets and
#       also the storage maintenance rate.  The default is 20.
#Default:
# store_objects_per_bucket 20

# HTTP OPTIONS
# -----------------------------------------------------------------------------

#  TAG: request_header_max_size (KB)
#       This specifies the maximum size for HTTP headers in a request.
#       Request headers are usually relatively small (about 512 bytes).
#       Placing a limit on the request header size will catch certain
#       bugs (for example with persistent connections) and possibly
#       buffer-overflow or denial-of-service attacks.
#Default:
# request_header_max_size 64 KB

#  TAG: reply_header_max_size   (KB)
#       This specifies the maximum size for HTTP headers in a reply.
#       Reply headers are usually relatively small (about 512 bytes).
#       Placing a limit on the reply header size will catch certain
#       bugs (for example with persistent connections) and possibly
#       buffer-overflow or denial-of-service attacks.
#Default:
# reply_header_max_size 64 KB

#  TAG: request_body_max_size   (bytes)
#       This specifies the maximum size for an HTTP request body.
#       In other words, the maximum size of a PUT/POST request.
#       A user who attempts to send a request with a body larger
#       than this limit receives an "Invalid Request" error message.
#       If you set this parameter to a zero (the default), there will
#       be no limit imposed.
#Default:
# request_body_max_size 0 KB

#  TAG: chunked_request_body_max_size   (bytes)
#       A broken or confused HTTP/1.1 client may send a chunked HTTP
#       request to Squid. Squid does not have full support for that
#       feature yet. To cope with such requests, Squid buffers the
#       entire request and then dechunks request body to create a
#       plain HTTP/1.0 request with a known content length. The plain
#       request is then used by the rest of Squid code as usual.
#
#       The option value specifies the maximum size of the buffer used
#       to hold the request before the conversion. If the chunked
#       request size exceeds the specified limit, the conversion
#       fails, and the client receives an "unsupported request" error,
#       as if dechunking was disabled.
#
#       Dechunking is enabled by default. To disable conversion of
#       chunked requests, set the maximum to zero.
#
#       Request dechunking feature and this option in particular are a
#       temporary hack. When chunking requests and responses are fully
#       supported, there will be no need to buffer a chunked request.
#Default:
# chunked_request_body_max_size 64 KB

#  TAG: broken_posts
#       A list of ACL elements which, if matched, causes Squid to send
#       an extra CRLF pair after the body of a PUT/POST request.
#
#       Some HTTP servers has broken implementations of PUT/POST,
#       and rely on an extra CRLF pair sent by some WWW clients.
#
#       Quote from RFC2616 section 4.1 on this matter:
#
#         Note: certain buggy HTTP/1.0 client implementations generate an
#         extra CRLF's after a POST request. To restate what is explicitly
#         forbidden by the BNF, an HTTP/1.1 client must not preface or follow
#         a request with an extra CRLF.
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#
#Example:
# acl buggy_server url_regex ^http://....
# broken_posts allow buggy_server
#Default:
# none

#  TAG: icap_uses_indirect_client       on|off
#   Controls whether the indirect client address
#   (see follow_x_forwarded_for) instead of the
#   direct client address is passed to an ICAP
#   server as "X-Client-IP".
#Default:
# icap_uses_indirect_client on

#  TAG: via     on|off
#       If set (default), Squid will include a Via header in requests and
#       replies as required by RFC2616.
#Default:
# via on

#  TAG: ie_refresh      on|off
#       Microsoft Internet Explorer up until version 5.5 Service
#       Pack 1 has an issue with transparent proxies, wherein it
#       is impossible to force a refresh.  Turning this on provides
#       a partial fix to the problem, by causing all IMS-REFRESH
#       requests from older IE versions to check the origin server
#       for fresh content.  This reduces hit ratio by some amount
#       (~10% in my experience), but allows users to actually get
#       fresh content when they want it.  Note because Squid
#       cannot tell if the user is using 5.5 or 5.5SP1, the behavior
#       of 5.5 is unchanged from old versions of Squid (i.e. a
#       forced refresh is impossible).  Newer versions of IE will,
#       hopefully, continue to have the new behavior and will be
#       handled based on that assumption.  This option defaults to
#       the old Squid behavior, which is better for hit ratios but
#       worse for clients using IE, if they need to be able to
#       force fresh content.
#Default:
# ie_refresh off

#  TAG: vary_ignore_expire      on|off
#       Many HTTP servers supporting Vary gives such objects
#       immediate expiry time with no cache-control header
#       when requested by a HTTP/1.0 client. This option
#       enables Squid to ignore such expiry times until
#       HTTP/1.1 is fully implemented.
#
#       WARNING: If turned on this may eventually cause some
#       varying objects not intended for caching to get cached.
#Default:
# vary_ignore_expire off

#  TAG: request_entities
#       Squid defaults to deny GET and HEAD requests with request entities,
#       as the meaning of such requests are undefined in the HTTP standard
#       even if not explicitly forbidden.
#
#       Set this directive to on if you have clients which insists
#       on sending request entities in GET or HEAD requests. But be warned
#       that there is server software (both proxies and web servers) which
#       can fail to properly process this kind of request which may make you
#       vulnerable to cache pollution attacks if enabled.
#Default:
# request_entities off

#  TAG: request_header_access
#       Usage: request_header_access header_name allow|deny [!]aclname ...
#
#       WARNING: Doing this VIOLATES the HTTP standard.  Enabling
#       this feature could make you liable for problems which it
#       causes.
#
#       This option replaces the old 'anonymize_headers' and the
#       older 'http_anonymizer' option with something that is much
#       more configurable. This new method creates a list of ACLs
#       for each header, allowing you very fine-tuned header
#       mangling.
#
#       This option only applies to request headers, i.e., from the
#       client to the server.
#
#       You can only specify known headers for the header name.
#       Other headers are reclassified as 'Other'. You can also
#       refer to all the headers with 'All'.
#
#       For example, to achieve the same behavior as the old
#       'http_anonymizer standard' option, you should use:
#
#               request_header_access From deny all
#               request_header_access Referer deny all
#               request_header_access Server deny all
#               request_header_access User-Agent deny all
#               request_header_access WWW-Authenticate deny all
#               request_header_access Link deny all
#
#       Or, to reproduce the old 'http_anonymizer paranoid' feature
#       you should use:
#
#               request_header_access Allow allow all
#               request_header_access Authorization allow all
#               request_header_access WWW-Authenticate allow all
#               request_header_access Proxy-Authorization allow all
#               request_header_access Proxy-Authenticate allow all
#               request_header_access Cache-Control allow all
#               request_header_access Content-Encoding allow all
#               request_header_access Content-Length allow all
#               request_header_access Content-Type allow all
#               request_header_access Date allow all
#               request_header_access Expires allow all
#               request_header_access Host allow all
#               request_header_access If-Modified-Since allow all
#               request_header_access Last-Modified allow all
#               request_header_access Location allow all
#               request_header_access Pragma allow all
#               request_header_access Accept allow all
#               request_header_access Accept-Charset allow all
#               request_header_access Accept-Encoding allow all
#               request_header_access Accept-Language allow all
#               request_header_access Content-Language allow all
#               request_header_access Mime-Version allow all
#               request_header_access Retry-After allow all
#               request_header_access Title allow all
#               request_header_access Connection allow all
#               request_header_access Proxy-Connection allow all
#               request_header_access All deny all
#
#       although many of those are HTTP reply headers, and so should be
#       controlled with the reply_header_access directive.
#
#       By default, all headers are allowed (no anonymizing is
#       performed).
#Default:
# none

#  TAG: reply_header_access
#       Usage: reply_header_access header_name allow|deny [!]aclname ...
#
#       WARNING: Doing this VIOLATES the HTTP standard.  Enabling
#       this feature could make you liable for problems which it
#       causes.
#
#       This option only applies to reply headers, i.e., from the
#       server to the client.
#
#       This is the same as request_header_access, but in the other
#       direction.
#
#       This option replaces the old 'anonymize_headers' and the
#       older 'http_anonymizer' option with something that is much
#       more configurable. This new method creates a list of ACLs
#       for each header, allowing you very fine-tuned header
#       mangling.
#
#       You can only specify known headers for the header name.
#       Other headers are reclassified as 'Other'. You can also
#       refer to all the headers with 'All'.
#
#       For example, to achieve the same behavior as the old
#       'http_anonymizer standard' option, you should use:
#
#               reply_header_access From deny all
#               reply_header_access Referer deny all
#               reply_header_access Server deny all
#               reply_header_access User-Agent deny all
#               reply_header_access WWW-Authenticate deny all
#               reply_header_access Link deny all
#
#       Or, to reproduce the old 'http_anonymizer paranoid' feature
#       you should use:
#
#               reply_header_access Allow allow all
#               reply_header_access Authorization allow all
#               reply_header_access WWW-Authenticate allow all
#               reply_header_access Proxy-Authorization allow all
#               reply_header_access Proxy-Authenticate allow all
#               reply_header_access Cache-Control allow all
#               reply_header_access Content-Encoding allow all
#               reply_header_access Content-Length allow all
#               reply_header_access Content-Type allow all
#               reply_header_access Date allow all
#               reply_header_access Expires allow all
#               reply_header_access Host allow all
#               reply_header_access If-Modified-Since allow all
#               reply_header_access Last-Modified allow all
#               reply_header_access Location allow all
#               reply_header_access Pragma allow all
#               reply_header_access Accept allow all
#               reply_header_access Accept-Charset allow all
#               reply_header_access Accept-Encoding allow all
#               reply_header_access Accept-Language allow all
#               reply_header_access Content-Language allow all
#               reply_header_access Mime-Version allow all
#               reply_header_access Retry-After allow all
#               reply_header_access Title allow all
#               reply_header_access Connection allow all
#               reply_header_access Proxy-Connection allow all
#               reply_header_access All deny all
#
#       although the HTTP request headers won't be usefully controlled
#       by this directive -- see request_header_access for details.
#
#       By default, all headers are allowed (no anonymizing is
#       performed).
#Default:
# none

#  TAG: header_replace
#       Usage:   header_replace header_name message
#       Example: header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit)
#
#       This option allows you to change the contents of headers
#       denied with header_access above, by replacing them with
#       some fixed string. This replaces the old fake_user_agent
#       option.
#
#       This only applies to request headers, not reply headers.
#
#       By default, headers are removed if denied.
#Default:
# none

#  TAG: relaxed_header_parser   on|off|warn
#       In the default "on" setting Squid accepts certain forms
#       of non-compliant HTTP messages where it is unambiguous
#       what the sending application intended even if the message
#       is not correctly formatted. The messages is then normalized
#       to the correct form when forwarded by Squid.
#
#       If set to "warn" then a warning will be emitted in cache.log
#       each time such HTTP error is encountered.
#
#       If set to "off" then such HTTP errors will cause the request
#       or response to be rejected.
#Default:
# relaxed_header_parser on

#  TAG: ignore_expect_100       on|off
#       This option makes Squid ignore any Expect: 100-continue header present
#       in the request. RFC 2616 requires that Squid being unable to satisfy
#       the response expectation MUST return a 417 error.
#
#       Note: Enabling this is a HTTP protocol violation, but some clients may
#       not handle it well..
#Default:
# ignore_expect_100 off

# TIMEOUTS
# -----------------------------------------------------------------------------

#  TAG: forward_timeout time-units
#       This parameter specifies how long Squid should at most attempt in
#       finding a forwarding path for the request before giving up.
#Default:
# forward_timeout 4 minutes

#  TAG: connect_timeout time-units
#       This parameter specifies how long to wait for the TCP connect to
#       the requested server or peer to complete before Squid should
#       attempt to find another path where to forward the request.
#Default:
# connect_timeout 1 minute

#  TAG: peer_connect_timeout    time-units
#       This parameter specifies how long to wait for a pending TCP
#       connection to a peer cache.  The default is 30 seconds.   You
#       may also set different timeout values for individual neighbors
#       with the 'connect-timeout' option on a 'cache_peer' line.
#Default:
# peer_connect_timeout 30 seconds

#  TAG: read_timeout    time-units
#       The read_timeout is applied on server-side connections.  After
#       each successful read(), the timeout will be extended by this
#       amount.  If no data is read again after this amount of time,
#       the request is aborted and logged with ERR_READ_TIMEOUT.  The
#       default is 15 minutes.
#Default:
# read_timeout 15 minutes

#  TAG: request_timeout
#       How long to wait for an HTTP request after initial
#       connection establishment.
#Default:
# request_timeout 5 minutes

#  TAG: persistent_request_timeout
#       How long to wait for the next HTTP request on a persistent
#       connection after the previous request completes.
#Default:
# persistent_request_timeout 2 minutes

#  TAG: client_lifetime time-units
#       The maximum amount of time a client (browser) is allowed to
#       remain connected to the cache process.  This protects the Cache
#       from having a lot of sockets (and hence file descriptors) tied up
#       in a CLOSE_WAIT state from remote clients that go away without
#       properly shutting down (either because of a network failure or
#       because of a poor client implementation).  The default is one
#       day, 1440 minutes.
#
#       NOTE:  The default value is intended to be much larger than any
#       client would ever need to be connected to your cache.  You
#       should probably change client_lifetime only as a last resort.
#       If you seem to have many client connections tying up
#       filedescriptors, we recommend first tuning the read_timeout,
#       request_timeout, persistent_request_timeout and quick_abort values.
#Default:
# client_lifetime 1 day

#  TAG: half_closed_clients
#       Some clients may shutdown the sending side of their TCP
#       connections, while leaving their receiving sides open.  Sometimes,
#       Squid can not tell the difference between a half-closed and a
#       fully-closed TCP connection.
#
#       By default, Squid will immediately close client connections when
#       read(2) returns "no more data to read."
#
#       Change this option to 'on' and Squid will keep open connections
#       until a read(2) or write(2) on the socket returns an error.
#       This may show some benefits for reverse proxies. But if not
#       it is recommended to leave OFF.
#Default:
# half_closed_clients off

#  TAG: pconn_timeout
#       Timeout for idle persistent connections to servers and other
#       proxies.
#Default:
# pconn_timeout 1 minute

#  TAG: ident_timeout
#       Maximum time to wait for IDENT lookups to complete.
#
#       If this is too high, and you enabled IDENT lookups from untrusted
#       users, you might be susceptible to denial-of-service by having
#       many ident requests going at once.
#Default:
# ident_timeout 10 seconds

#  TAG: shutdown_lifetime       time-units
#       When SIGTERM or SIGHUP is received, the cache is put into
#       "shutdown pending" mode until all active sockets are closed.
#       This value is the lifetime to set for all open descriptors
#       during shutdown mode.  Any active clients after this many
#       seconds will receive a 'timeout' message.
#Default:
# shutdown_lifetime 30 seconds

# ADMINISTRATIVE PARAMETERS
# -----------------------------------------------------------------------------

#  TAG: cache_mgr
#       Email-address of local cache manager who will receive
#       mail if the cache dies.  The default is "webmaster."
#Default:
# cache_mgr webmaster

#  TAG: mail_from
#       From: email-address for mail sent when the cache dies.
#       The default is to use 'appname@unique_hostname'.
#       Default appname value is "squid", can be changed into
#       src/globals.h before building squid.
#Default:
# none

#  TAG: mail_program
#       Email program used to send mail if the cache dies.
#       The default is "mail". The specified program must comply
#       with the standard Unix mail syntax:
#         mail-program recipient < mailfile
#
#       Optional command line options can be specified.
#Default:
# mail_program mail

#  TAG: cache_effective_user
#       If you start Squid as root, it will change its effective/real
#       UID/GID to the user specified below.  The default is to change
#       to UID of proxy.
#       see also; cache_effective_group
#Default:
# cache_effective_user proxy

#  TAG: cache_effective_group
#       Squid sets the GID to the effective user's default group ID
#       (taken from the password file) and supplementary group list
#       from the groups membership.
#
#       If you want Squid to run with a specific GID regardless of
#       the group memberships of the effective user then set this
#       to the group (or GID) you want Squid to run as. When set
#       all other group privileges of the effective user are ignored
#       and only this GID is effective. If Squid is not started as
#       root the user starting Squid MUST be member of the specified
#       group.
#
#       This option is not recommended by the Squid Team.
#       Our preference is for administrators to configure a secure
#       user account for squid with UID/GID matching system policies.
#Default:
# none

#  TAG: httpd_suppress_version_string   on|off
#       Suppress Squid version string info in HTTP headers and HTML error pages.
#Default:
# httpd_suppress_version_string off

#  TAG: visible_hostname
#       If you want to present a special hostname in error messages, etc,
#       define this.  Otherwise, the return value of gethostname()
#       will be used. If you have multiple caches in a cluster and
#       get errors about IP-forwarding you must set them to have individual
#       names with this setting.
#Default:
# visible_hostname localhost

#  TAG: unique_hostname
#       If you want to have multiple machines with the same
#       'visible_hostname' you must give each machine a different
#       'unique_hostname' so forwarding loops can be detected.
#Default:
# none

#  TAG: hostname_aliases
#       A list of other DNS names your cache has.
#Default:
# none

#  TAG: umask
#       Minimum umask which should be enforced while the proxy
#       is running, in addition to the umask set at startup.
#
#       For a traditional octal representation of umasks, start
#        your value with 0.
#Default:
# umask 027

# OPTIONS FOR THE CACHE REGISTRATION SERVICE
# -----------------------------------------------------------------------------
#
#       This section contains parameters for the (optional) cache
#       announcement service.  This service is provided to help
#       cache administrators locate one another in order to join or
#       create cache hierarchies.
#
#       An 'announcement' message is sent (via UDP) to the registration
#       service by Squid.  By default, the announcement message is NOT
#       SENT unless you enable it with 'announce_period' below.
#
#       The announcement message includes your hostname, plus the
#       following information from this configuration file:
#
#               http_port
#               icp_port
#               cache_mgr
#
#       All current information is processed regularly and made
#       available on the Web at http://www.ircache.net/Cache/Tracker/.

#  TAG: announce_period
#       This is how frequently to send cache announcements.  The
#       default is `0' which disables sending the announcement
#       messages.
#
#       To enable announcing your cache, just set an announce period.
#
#       Example:
#               announce_period 1 day
#Default:
# announce_period 0

#  TAG: announce_host
#  TAG: announce_file
#  TAG: announce_port
#       announce_host and announce_port set the hostname and port
#       number where the registration message will be sent.
#
#       Hostname will default to 'tracker.ircache.net' and port will
#       default default to 3131.  If the 'filename' argument is given,
#       the contents of that file will be included in the announce
#       message.
#Default:
# announce_host tracker.ircache.net
# announce_port 3131

# HTTPD-ACCELERATOR OPTIONS
# -----------------------------------------------------------------------------

#  TAG: httpd_accel_surrogate_id
#       Surrogates (http://www.esi.org/architecture_spec_1.0.html)
#       need an identification token to allow control targeting. Because
#       a farm of surrogates may all perform the same tasks, they may share
#       an identification token.
#Default:
# httpd_accel_surrogate_id unset-id

#  TAG: http_accel_surrogate_remote     on|off
#       Remote surrogates (such as those in a CDN) honour Surrogate-Control: no-store-remote.
#       Set this to on to have squid behave as a remote surrogate.
#Default:
# http_accel_surrogate_remote off

#  TAG: esi_parser      libxml2|expat|custom
#       ESI markup is not strictly XML compatible. The custom ESI parser
#       will give higher performance, but cannot handle non ASCII character
#       encodings.
#Default:
# esi_parser custom

# DELAY POOL PARAMETERS
# -----------------------------------------------------------------------------

#  TAG: delay_pools
#       This represents the number of delay pools to be used.  For example,
#       if you have one class 2 delay pool and one class 3 delays pool, you
#       have a total of 2 delay pools.
#Default:
# delay_pools 0

#  TAG: delay_class
#       This defines the class of each delay pool.  There must be exactly one
#       delay_class line for each delay pool.  For example, to define two
#       delay pools, one of class 2 and one of class 3, the settings above
#       and here would be:
#
#       Example:
#           delay_pools 4      # 4 delay pools
#           delay_class 1 2    # pool 1 is a class 2 pool
#           delay_class 2 3    # pool 2 is a class 3 pool
#           delay_class 3 4    # pool 3 is a class 4 pool
#           delay_class 4 5    # pool 4 is a class 5 pool
#
#       The delay pool classes are:
#
#               class 1         Everything is limited by a single aggregate
#                               bucket.
#
#               class 2         Everything is limited by a single aggregate
#                               bucket as well as an "individual" bucket chosen
#                               from bits 25 through 32 of the IPv4 address.
#
#               class 3         Everything is limited by a single aggregate
#                               bucket as well as a "network" bucket chosen
#                               from bits 17 through 24 of the IP address and a
#                               "individual" bucket chosen from bits 17 through
#                               32 of the IPv4 address.
#
#               class 4         Everything in a class 3 delay pool, with an
#                               additional limit on a per user basis. This
#                               only takes effect if the username is established
#                               in advance - by forcing authentication in your
#                               http_access rules.
#
#               class 5         Requests are grouped according their tag (see
#                               external_acl's tag= reply).
#
#       NOTE: If an IP address is a.b.c.d
#               -> bits 25 through 32 are "d"
#               -> bits 17 through 24 are "c"
#               -> bits 17 through 32 are "c * 256 + d"
#
#       NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to
#               IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic.
#Default:
# none

#  TAG: delay_access
#       This is used to determine which delay pool a request falls into.
#
#       delay_access is sorted per pool and the matching starts with pool 1,
#       then pool 2, ..., and finally pool N. The first delay pool where the
#       request is allowed is selected for the request. If it does not allow
#       the request to any pool then the request is not delayed (default).
#
#       For example, if you want some_big_clients in delay
#       pool 1 and lotsa_little_clients in delay pool 2:
#
#Example:
# delay_access 1 allow some_big_clients
# delay_access 1 deny all
# delay_access 2 allow lotsa_little_clients
# delay_access 2 deny all
# delay_access 3 allow authenticated_clients
#Default:
# none

#  TAG: delay_parameters
#       This defines the parameters for a delay pool.  Each delay pool has
#       a number of "buckets" associated with it, as explained in the
#       description of delay_class.  For a class 1 delay pool, the syntax is:
#
#delay_parameters pool aggregate
#
#       For a class 2 delay pool:
#
#delay_parameters pool aggregate individual
#
#       For a class 3 delay pool:
#
#delay_parameters pool aggregate network individual
#
#       For a class 4 delay pool:
#
#delay_parameters pool aggregate network individual user
#
#       For a class 5 delay pool:
#
#delay_parameters pool tag
#
#       The variables here are:
#
#               pool            a pool number - ie, a number between 1 and the
#                               number specified in delay_pools as used in
#                               delay_class lines.
#
#               aggregate       the "delay parameters" for the aggregate bucket
#                               (class 1, 2, 3).
#
#               individual      the "delay parameters" for the individual
#                               buckets (class 2, 3).
#
#               network         the "delay parameters" for the network buckets
#                               (class 3).
#
#               user            the delay parameters for the user buckets
#                               (class 4).
#
#               tag             the delay parameters for the tag buckets
#                               (class 5).
#
#       A pair of delay parameters is written restore/maximum, where restore is
#       the number of bytes (not bits - modem and network speeds are usually
#       quoted in bits) per second placed into the bucket, and maximum is the
#       maximum number of bytes which can be in the bucket at any time.
#
#       For example, if delay pool number 1 is a class 2 delay pool as in the
#       above example, and is being used to strictly limit each host to 64kbps
#       (plus overheads), with no overall limit, the line is:
#
#delay_parameters 1 -1/-1 8000/8000
#
#       Note that the figure -1 is used to represent "unlimited".
#
#       And, if delay pool number 2 is a class 3 delay pool as in the above
#       example, and you want to limit it to a total of 256kbps (strict limit)
#       with each 8-bit network permitted 64kbps (strict limit) and each
#       individual host permitted 4800bps with a bucket maximum size of 64kb
#       to permit a decent web page to be downloaded at a decent speed
#       (if the network is not being limited due to overuse) but slow down
#       large downloads more significantly:
#
#delay_parameters 2 32000/32000 8000/8000 600/8000
#
#       There must be one delay_parameters line for each delay pool.
#
#       Finally, for a class 4 delay pool as in the example - each user will
#       be limited to 128Kb no matter how many workstations they are logged into.:
#
#delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000
#Default:
# none

#  TAG: delay_initial_bucket_level      (percent, 0-100)
#       The initial bucket percentage is used to determine how much is put
#       in each bucket when squid starts, is reconfigured, or first notices
#       a host accessing it (in class 2 and class 3, individual hosts and
#       networks only have buckets associated with them once they have been
#       "seen" by squid).
#Default:
# delay_initial_bucket_level 50

# WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS
# -----------------------------------------------------------------------------

#  TAG: wccp_router
#       Use this option to define your WCCP ``home'' router for
#       Squid.
#
#       wccp_router supports a single WCCP(v1) router
#
#       wccp2_router supports multiple WCCPv2 routers
#
#       only one of the two may be used at the same time and defines
#       which version of WCCP to use.
#Default:
# wccp_router any_addr

#  TAG: wccp2_router
#       Use this option to define your WCCP ``home'' router for
#       Squid.
#
#       wccp_router supports a single WCCP(v1) router
#
#       wccp2_router supports multiple WCCPv2 routers
#
#       only one of the two may be used at the same time and defines
#       which version of WCCP to use.
#Default:
# none

#  TAG: wccp_version
#       This directive is only relevant if you need to set up WCCP(v1)
#       to some very old and end-of-life Cisco routers. In all other
#       setups it must be left unset or at the default setting.
#       It defines an internal version in the WCCP(v1) protocol,
#       with version 4 being the officially documented protocol.
#
#       According to some users, Cisco IOS 11.2 and earlier only
#       support WCCP version 3.  If you're using that or an earlier
#       version of IOS, you may need to change this value to 3, otherwise
#       do not specify this parameter.
#Default:
# wccp_version 4

#  TAG: wccp2_rebuild_wait
#       If this is enabled Squid will wait for the cache dir rebuild to finish
#       before sending the first wccp2 HereIAm packet
#Default:
# wccp2_rebuild_wait on

#  TAG: wccp2_forwarding_method
#       WCCP2 allows the setting of forwarding methods between the
#       router/switch and the cache.  Valid values are as follows:
#
#       gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
#       l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)
#
#       Currently (as of IOS 12.4) cisco routers only support GRE.
#       Cisco switches only support the L2 redirect assignment method.
#Default:
# wccp2_forwarding_method gre

#  TAG: wccp2_return_method
#       WCCP2 allows the setting of return methods between the
#       router/switch and the cache for packets that the cache
#       decides not to handle.  Valid values are as follows:
#
#       gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel)
#       l2  - L2 redirect (forward the packet using Layer 2/MAC rewriting)
#
#       Currently (as of IOS 12.4) cisco routers only support GRE.
#       Cisco switches only support the L2 redirect assignment.
#
#       If the "ip wccp redirect exclude in" command has been
#       enabled on the cache interface, then it is still safe for
#       the proxy server to use a l2 redirect method even if this
#       option is set to GRE.
#Default:
# wccp2_return_method gre

#  TAG: wccp2_assignment_method
#       WCCP2 allows the setting of methods to assign the WCCP hash
#       Valid values are as follows:
#
#       hash - Hash assignment
#       mask  - Mask assignment
#
#       As a general rule, cisco routers support the hash assignment method
#       and cisco switches support the mask assignment method.
#Default:
# wccp2_assignment_method hash

#  TAG: wccp2_service
#       WCCP2 allows for multiple traffic services. There are two
#       types: "standard" and "dynamic". The standard type defines
#       one service id - http (id 0). The dynamic service ids can be from
#       51 to 255 inclusive.  In order to use a dynamic service id
#       one must define the type of traffic to be redirected; this is done
#       using the wccp2_service_info option.
#
#       The "standard" type does not require a wccp2_service_info option,
#       just specifying the service id will suffice.
#
#       MD5 service authentication can be enabled by adding
#       "password=<password>" to the end of this service declaration.
#
#       Examples:
#
#       wccp2_service standard 0        # for the 'web-cache' standard service
#       wccp2_service dynamic 80        # a dynamic service type which will be
#                                       # fleshed out with subsequent options.
#       wccp2_service standard 0 password=foo
#Default:
# wccp2_service standard 0

#  TAG: wccp2_service_info
#       Dynamic WCCPv2 services require further information to define the
#       traffic you wish to have diverted.
#
#       The format is:
#
#       wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>..
#           priority=<priority> ports=<port>,<port>..
#
#       The relevant WCCPv2 flags:
#       + src_ip_hash, dst_ip_hash
#       + source_port_hash, dst_port_hash
#       + src_ip_alt_hash, dst_ip_alt_hash
#       + src_port_alt_hash, dst_port_alt_hash
#       + ports_source
#
#       The port list can be one to eight entries.
#
#       Example:
#
#       wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source
#           priority=240 ports=80
#
#       Note: the service id must have been defined by a previous
#       'wccp2_service dynamic <id>' entry.
#Default:
# none

#  TAG: wccp2_weight
#       Each cache server gets assigned a set of the destination
#       hash proportional to their weight.
#Default:
# wccp2_weight 10000

#  TAG: wccp_address
#  TAG: wccp2_address
#       Use this option if you require WCCP to use a specific
#       interface address.
#
#       The default behavior is to not bind to any specific address.
#Default:
# wccp_address 0.0.0.0
# wccp2_address 0.0.0.0

# PERSISTENT CONNECTION HANDLING
# -----------------------------------------------------------------------------
#
# Also see "pconn_timeout" in the TIMEOUTS section

#  TAG: client_persistent_connections
#  TAG: server_persistent_connections
#       Persistent connection support for clients and servers.  By
#       default, Squid uses persistent connections (when allowed)
#       with its clients and servers.  You can use these options to
#       disable persistent connections with clients and/or servers.
#Default:
# client_persistent_connections on
# server_persistent_connections on

#  TAG: persistent_connection_after_error
#       With this directive the use of persistent connections after
#       HTTP errors can be disabled. Useful if you have clients
#       who fail to handle errors on persistent connections proper.
#Default:
# persistent_connection_after_error on

#  TAG: detect_broken_pconn
#       Some servers have been found to incorrectly signal the use
#       of HTTP/1.0 persistent connections even on replies not
#       compatible, causing significant delays. This server problem
#       has mostly been seen on redirects.
#
#       By enabling this directive Squid attempts to detect such
#       broken replies and automatically assume the reply is finished
#       after 10 seconds timeout.
#Default:
# detect_broken_pconn off

# CACHE DIGEST OPTIONS
# -----------------------------------------------------------------------------

#  TAG: digest_generation
#       This controls whether the server will generate a Cache Digest
#       of its contents.  By default, Cache Digest generation is
#       enabled if Squid is compiled with --enable-cache-digests defined.
#Default:
# digest_generation on

#  TAG: digest_bits_per_entry
#       This is the number of bits of the server's Cache Digest which
#       will be associated with the Digest entry for a given HTTP
#       Method and URL (public key) combination.  The default is 5.
#Default:
# digest_bits_per_entry 5

#  TAG: digest_rebuild_period   (seconds)
#       This is the wait time between Cache Digest rebuilds.
#Default:
# digest_rebuild_period 1 hour

#  TAG: digest_rewrite_period   (seconds)
#       This is the wait time between Cache Digest writes to
#       disk.
#Default:
# digest_rewrite_period 1 hour

#  TAG: digest_swapout_chunk_size       (bytes)
#       This is the number of bytes of the Cache Digest to write to
#       disk at a time.  It defaults to 4096 bytes (4KB), the Squid
#       default swap page.
#Default:
# digest_swapout_chunk_size 4096 bytes

#  TAG: digest_rebuild_chunk_percentage (percent, 0-100)
#       This is the percentage of the Cache Digest to be scanned at a
#       time.  By default it is set to 10% of the Cache Digest.
#Default:
# digest_rebuild_chunk_percentage 10

# SNMP OPTIONS
# -----------------------------------------------------------------------------

#  TAG: snmp_port
#       The port number where Squid listens for SNMP requests. To enable
#       SNMP support set this to a suitable port number. Port number
#       3401 is often used for the Squid SNMP agent. By default it's
#       set to "0" (disabled)
#
#       Example:
#               snmp_port 3401
#Default:
# snmp_port 0

#  TAG: snmp_access
#       Allowing or denying access to the SNMP port.
#
#       All access to the agent is denied by default.
#       usage:
#
#       snmp_access allow|deny [!]aclname ...
#
#       This clause only supports fast acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Example:
# snmp_access allow snmppublic localhost
# snmp_access deny all
#Default:
# snmp_access deny all

#  TAG: snmp_incoming_address
#  TAG: snmp_outgoing_address
#       Just like 'udp_incoming_address', but for the SNMP port.
#
#       snmp_incoming_address   is used for the SNMP socket receiving
#                               messages from SNMP agents.
#       snmp_outgoing_address   is used for SNMP packets returned to SNMP
#                               agents.
#
#       The default snmp_incoming_address is to listen on all
#       available network interfaces.
#
#       If snmp_outgoing_address is not set it will use the same socket
#       as snmp_incoming_address. Only change this if you want to have
#       SNMP replies sent using another address than where this Squid
#       listens for SNMP queries.
#
#       NOTE, snmp_incoming_address and snmp_outgoing_address can not have
#       the same value since they both use port 3401.
#Default:
# snmp_incoming_address any_addr
# snmp_outgoing_address no_addr

# ICP OPTIONS
# -----------------------------------------------------------------------------

#  TAG: icp_port
#       The port number where Squid sends and receives ICP queries to
#       and from neighbor caches.  The standard UDP port for ICP is 3130.
#       Default is disabled (0).
#
#       Example:
#               icp_port 3130
#Default:
# icp_port 0

#  TAG: htcp_port
#       The port number where Squid sends and receives HTCP queries to
#       and from neighbor caches.  To turn it on you want to set it to
#       4827. By default it is set to "0" (disabled).
#
#       Example:
#               htcp_port 4827
#Default:
# htcp_port 0

#  TAG: log_icp_queries on|off
#       If set, ICP queries are logged to access.log. You may wish
#       do disable this if your ICP load is VERY high to speed things
#       up or to simplify log analysis.
#Default:
# log_icp_queries on

#  TAG: udp_incoming_address
#       udp_incoming_address    is used for UDP packets received from other
#                               caches.
#
#       The default behavior is to not bind to any specific address.
#
#       Only change this if you want to have all UDP queries received on
#       a specific interface/address.
#
#       NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS
#       modules. Altering it will affect all of them in the same manner.
#
#       see also; udp_outgoing_address
#
#       NOTE, udp_incoming_address and udp_outgoing_address can not
#       have the same value since they both use the same port.
#Default:
# udp_incoming_address any_addr

#  TAG: udp_outgoing_address
#       udp_outgoing_address    is used for UDP packets sent out to other
#                               caches.
#
#       The default behavior is to not bind to any specific address.
#
#       Instead it will use the same socket as udp_incoming_address.
#       Only change this if you want to have UDP queries sent using another
#       address than where this Squid listens for UDP queries from other
#       caches.
#
#       NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS
#       modules. Altering it will affect all of them in the same manner.
#
#       see also; udp_incoming_address
#
#       NOTE, udp_incoming_address and udp_outgoing_address can not
#       have the same value since they both use the same port.
#Default:
# udp_outgoing_address no_addr

#  TAG: icp_hit_stale   on|off
#       If you want to return ICP_HIT for stale cache objects, set this
#       option to 'on'.  If you have sibling relationships with caches
#       in other administrative domains, this should be 'off'.  If you only
#       have sibling relationships with caches under your control,
#       it is probably okay to set this to 'on'.
#       If set to 'on', your siblings should use the option "allow-miss"
#       on their cache_peer lines for connecting to you.
#Default:
# icp_hit_stale off

#  TAG: minimum_direct_hops
#       If using the ICMP pinging stuff, do direct fetches for sites
#       which are no more than this many hops away.
#Default:
# minimum_direct_hops 4

#  TAG: minimum_direct_rtt
#       If using the ICMP pinging stuff, do direct fetches for sites
#       which are no more than this many rtt milliseconds away.
#Default:
# minimum_direct_rtt 400

#  TAG: netdb_low
#  TAG: netdb_high
#       The low and high water marks for the ICMP measurement
#       database.  These are counts, not percents.  The defaults are
#       900 and 1000.  When the high water mark is reached, database
#       entries will be deleted until the low mark is reached.
#Default:
# netdb_low 900
# netdb_high 1000

#  TAG: netdb_ping_period
#       The minimum period for measuring a site.  There will be at
#       least this much delay between successive pings to the same
#       network.  The default is five minutes.
#Default:
# netdb_ping_period 5 minutes

#  TAG: query_icmp      on|off
#       If you want to ask your peers to include ICMP data in their ICP
#       replies, enable this option.
#
#       If your peer has configured Squid (during compilation) with
#       '--enable-icmp' that peer will send ICMP pings to origin server
#       sites of the URLs it receives.  If you enable this option the
#       ICP replies from that peer will include the ICMP data (if available).
#       Then, when choosing a parent cache, Squid will choose the parent with
#       the minimal RTT to the origin server.  When this happens, the
#       hierarchy field of the access.log will be
#       "CLOSEST_PARENT_MISS".  This option is off by default.
#Default:
# query_icmp off

#  TAG: test_reachability       on|off
#       When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH
#       instead of ICP_MISS if the target host is NOT in the ICMP
#       database, or has a zero RTT.
#Default:
# test_reachability off

#  TAG: icp_query_timeout       (msec)
#       Normally Squid will automatically determine an optimal ICP
#       query timeout value based on the round-trip-time of recent ICP
#       queries.  If you want to override the value determined by
#       Squid, set this 'icp_query_timeout' to a non-zero value.  This
#       value is specified in MILLISECONDS, so, to use a 2-second
#       timeout (the old default), you would write:
#
#               icp_query_timeout 2000
#Default:
# icp_query_timeout 0

#  TAG: maximum_icp_query_timeout       (msec)
#       Normally the ICP query timeout is determined dynamically.  But
#       sometimes it can lead to very large values (say 5 seconds).
#       Use this option to put an upper limit on the dynamic timeout
#       value.  Do NOT use this option to always use a fixed (instead
#       of a dynamic) timeout value. To set a fixed timeout see the
#       'icp_query_timeout' directive.
#Default:
# maximum_icp_query_timeout 2000

#  TAG: minimum_icp_query_timeout       (msec)
#       Normally the ICP query timeout is determined dynamically.  But
#       sometimes it can lead to very small timeouts, even lower than
#       the normal latency variance on your link due to traffic.
#       Use this option to put an lower limit on the dynamic timeout
#       value.  Do NOT use this option to always use a fixed (instead
#       of a dynamic) timeout value. To set a fixed timeout see the
#       'icp_query_timeout' directive.
#Default:
# minimum_icp_query_timeout 5

#  TAG: background_ping_rate    time-units
#       Controls how often the ICP pings are sent to siblings that
#       have background-ping set.
#Default:
# background_ping_rate 10 seconds

# MULTICAST ICP OPTIONS
# -----------------------------------------------------------------------------

#  TAG: mcast_groups
#       This tag specifies a list of multicast groups which your server
#       should join to receive multicasted ICP queries.
#
#       NOTE!  Be very careful what you put here!  Be sure you
#       understand the difference between an ICP _query_ and an ICP
#       _reply_.  This option is to be set only if you want to RECEIVE
#       multicast queries.  Do NOT set this option to SEND multicast
#       ICP (use cache_peer for that).  ICP replies are always sent via
#       unicast, so this option does not affect whether or not you will
#       receive replies from multicast group members.
#
#       You must be very careful to NOT use a multicast address which
#       is already in use by another group of caches.
#
#       If you are unsure about multicast, please read the Multicast
#       chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/).
#
#       Usage: mcast_groups 239.128.16.128 224.0.1.20
#
#       By default, Squid doesn't listen on any multicast groups.
#Default:
# none

#  TAG: mcast_miss_addr
# Note: This option is only available if Squid is rebuilt with the
#       -DMULTICAST_MISS_STREAM define
#
#       If you enable this option, every "cache miss" URL will
#       be sent out on the specified multicast address.
#
#       Do not enable this option unless you are are absolutely
#       certain you understand what you are doing.
#Default:
# mcast_miss_addr no_addr

#  TAG: mcast_miss_ttl
# Note: This option is only available if Squid is rebuilt with the
#       -DMULTICAST_MISS_STREAM define
#
#       This is the time-to-live value for packets multicasted
#       when multicasting off cache miss URLs is enabled.  By
#       default this is set to 'site scope', i.e. 16.
#Default:
# mcast_miss_ttl 16

#  TAG: mcast_miss_port
# Note: This option is only available if Squid is rebuilt with the
#       -DMULTICAST_MISS_STREAM define
#
#       This is the port number to be used in conjunction with
#       'mcast_miss_addr'.
#Default:
# mcast_miss_port 3135

#  TAG: mcast_miss_encode_key
# Note: This option is only available if Squid is rebuilt with the
#       -DMULTICAST_MISS_STREAM define
#
#       The URLs that are sent in the multicast miss stream are
#       encrypted.  This is the encryption key.
#Default:
# mcast_miss_encode_key XXXXXXXXXXXXXXXX

#  TAG: mcast_icp_query_timeout (msec)
#       For multicast peers, Squid regularly sends out ICP "probes" to
#       count how many other peers are listening on the given multicast
#       address.  This value specifies how long Squid should wait to
#       count all the replies.  The default is 2000 msec, or 2
#       seconds.
#Default:
# mcast_icp_query_timeout 2000

# INTERNAL ICON OPTIONS
# -----------------------------------------------------------------------------

#  TAG: icon_directory
#       Where the icons are stored. These are normally kept in
#       /usr/share/squid3/icons
#Default:
# icon_directory /usr/share/squid3/icons

#  TAG: global_internal_static
#       This directive controls is Squid should intercept all requests for
#       /squid-internal-static/ no matter which host the URL is requesting
#       (default on setting), or if nothing special should be done for
#       such URLs (off setting). The purpose of this directive is to make
#       icons etc work better in complex cache hierarchies where it may
#       not always be possible for all corners in the cache mesh to reach
#       the server generating a directory listing.
#Default:
# global_internal_static on

#  TAG: short_icon_urls
#       If this is enabled Squid will use short URLs for icons.
#       If disabled it will revert to the old behavior of including
#       it's own name and port in the URL.
#
#       If you run a complex cache hierarchy with a mix of Squid and
#       other proxies you may need to disable this directive.
#Default:
# short_icon_urls on

# ERROR PAGE OPTIONS
# -----------------------------------------------------------------------------

#  TAG: error_directory
#       If you wish to create your own versions of the default
#       error files to customize them to suit your company copy
#       the error/template files to another directory and point
#       this tag at them.
#
#       WARNING: This option will disable multi-language support
#                on error pages if used.
#
#       The squid developers are interested in making squid available in
#       a wide variety of languages. If you are making translations for a
#       language that Squid does not currently provide please consider
#       contributing your translation back to the project.
#       http://wiki.squid-cache.org/Translations
#
#       The squid developers working on translations are happy to supply drop-in
#       translated error files in exchange for any new language contributions.
#Default:
# none

#  TAG: error_default_language
#       Set the default language which squid will send error pages in
#       if no existing translation matches the clients language
#       preferences.
#
#       If unset (default) generic English will be used.
#
#       The squid developers are interested in making squid available in
#       a wide variety of languages. If you are interested in making
#       translations for any language see the squid wiki for details.
#       http://wiki.squid-cache.org/Translations
#Default:
# none

#  TAG: error_log_languages
#       Log to cache.log what languages users are attempting to
#       auto-negotiate for translations.
#
#       Successful negotiations are not logged. Only failures
#       have meaning to indicate that Squid may need an upgrade
#       of its error page translations.
#Default:
# error_log_languages on

#  TAG: err_page_stylesheet
#       CSS Stylesheet to pattern the display of Squid default error pages.
#
#       For information on CSS see http://www.w3.org/Style/CSS/
#Default:
# err_page_stylesheet /etc/squid3/errorpage.css

#  TAG: err_html_text
#       HTML text to include in error messages.  Make this a "mailto"
#       URL to your admin address, or maybe just a link to your
#       organizations Web page.
#
#       To include this in your error messages, you must rewrite
#       the error template files (found in the "errors" directory).
#       Wherever you want the 'err_html_text' line to appear,
#       insert a %L tag in the error template file.
#Default:
# none

#  TAG: email_err_data  on|off
#       If enabled, information about the occurred error will be
#       included in the mailto links of the ERR pages (if %W is set)
#       so that the email body contains the data.
#       Syntax is <A HREF="mailto:%w%W">%w</A>
#Default:
# email_err_data on

#  TAG: deny_info
#       Usage:   deny_info err_page_name acl
#       or       deny_info http://... acl
#       or       deny_info TCP_RESET acl
#
#       This can be used to return a ERR_ page for requests which
#       do not pass the 'http_access' rules.  Squid remembers the last
#       acl it evaluated in http_access, and if a 'deny_info' line exists
#       for that ACL Squid returns a corresponding error page.
#
#       The acl is typically the last acl on the http_access deny line which
#       denied access. The exceptions to this rule are:
#       - When Squid needs to request authentication credentials. It's then
#         the first authentication related acl encountered
#       - When none of the http_access lines matches. It's then the last
#         acl processed on the last http_access line.
#
#       NP: If providing your own custom error pages with error_directory
#           you may also specify them by your custom file name:
#           Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys
#
#       Alternatively you can specify an error URL. The browsers will
#       get redirected (302) to the specified URL. %s in the redirection
#       URL will be replaced by the requested URL.
#
#       Alternatively you can tell Squid to reset the TCP connection
#       by specifying TCP_RESET.
#Default:
# none

# OPTIONS INFLUENCING REQUEST FORWARDING 
# -----------------------------------------------------------------------------

#  TAG: nonhierarchical_direct
#       By default, Squid will send any non-hierarchical requests
#       (matching hierarchy_stoplist or not cacheable request type) direct
#       to origin servers.
#
#       If you set this to off, Squid will prefer to send these
#       requests to parents.
#
#       Note that in most configurations, by turning this off you will only
#       add latency to these request without any improvement in global hit
#       ratio.
#
#       If you are inside an firewall see never_direct instead of
#       this directive.
#Default:
# nonhierarchical_direct on

#  TAG: prefer_direct
#       Normally Squid tries to use parents for most requests. If you for some
#       reason like it to first try going direct and only use a parent if
#       going direct fails set this to on.
#
#       By combining nonhierarchical_direct off and prefer_direct on you
#       can set up Squid to use a parent as a backup path if going direct
#       fails.
#
#       Note: If you want Squid to use parents for all requests see
#       the never_direct directive. prefer_direct only modifies how Squid
#       acts on cacheable requests.
#Default:
# prefer_direct off

#  TAG: always_direct
#       Usage: always_direct allow|deny [!]aclname ...
#
#       Here you can use ACL elements to specify requests which should
#       ALWAYS be forwarded by Squid to the origin servers without using
#       any peers.  For example, to always directly forward requests for
#       local servers ignoring any parents or siblings you may have use
#       something like:
#
#               acl local-servers dstdomain my.domain.net
#               always_direct allow local-servers
#
#       To always forward FTP requests directly, use
#
#               acl FTP proto FTP
#               always_direct allow FTP
#
#       NOTE: There is a similar, but opposite option named
#       'never_direct'.  You need to be aware that "always_direct deny
#       foo" is NOT the same thing as "never_direct allow foo".  You
#       may need to use a deny rule to exclude a more-specific case of
#       some other rule.  Example:
#
#               acl local-external dstdomain external.foo.net
#               acl local-servers dstdomain  .foo.net
#               always_direct deny local-external
#               always_direct allow local-servers
#
#       NOTE: If your goal is to make the client forward the request
#       directly to the origin server bypassing Squid then this needs
#       to be done in the client configuration. Squid configuration
#       can only tell Squid how Squid should fetch the object.
#
#       NOTE: This directive is not related to caching. The replies
#       is cached as usual even if you use always_direct. To not cache
#       the replies see the 'cache' directive.
#
#       This clause supports both fast and slow acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# none

#  TAG: never_direct
#       Usage: never_direct allow|deny [!]aclname ...
#
#       never_direct is the opposite of always_direct.  Please read
#       the description for always_direct if you have not already.
#
#       With 'never_direct' you can use ACL elements to specify
#       requests which should NEVER be forwarded directly to origin
#       servers.  For example, to force the use of a proxy for all
#       requests, except those in your local domain use something like:
#
#               acl local-servers dstdomain .foo.net
#               never_direct deny local-servers
#               never_direct allow all
#
#       or if Squid is inside a firewall and there are local intranet
#       servers inside the firewall use something like:
#
#               acl local-intranet dstdomain .foo.net
#               acl local-external dstdomain external.foo.net
#               always_direct deny local-external
#               always_direct allow local-intranet
#               never_direct allow all
#
#       This clause supports both fast and slow acl types.
#       See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details.
#Default:
# none

# ADVANCED NETWORKING OPTIONS
# -----------------------------------------------------------------------------

#  TAG: incoming_icp_average
#  TAG: incoming_http_average
#  TAG: incoming_dns_average
#  TAG: min_icp_poll_cnt
#  TAG: min_dns_poll_cnt
#  TAG: min_http_poll_cnt
#       Heavy voodoo here.  I can't even believe you are reading this.
#       Are you crazy?  Don't even think about adjusting these unless
#       you understand the algorithms in comm_select.c first!
#Default:
# incoming_icp_average 6
# incoming_http_average 4
# incoming_dns_average 4
# min_icp_poll_cnt 8
# min_dns_poll_cnt 8
# min_http_poll_cnt 8

#  TAG: accept_filter
#       FreeBSD:
#
#       The name of an accept(2) filter to install on Squid's
#       listen socket(s).  This feature is perhaps specific to
#       FreeBSD and requires support in the kernel.
#
#       The 'httpready' filter delays delivering new connections
#       to Squid until a full HTTP request has been received.
#       See the accf_http(9) man page for details.
#
#       The 'dataready' filter delays delivering new connections
#       to Squid until there is some data to process.
#       See the accf_dataready(9) man page for details.
#
#       Linux:
#       
#       The 'data' filter delays delivering of new connections
#       to Squid until there is some data to process by TCP_ACCEPT_DEFER.
#       You may optionally specify a number of seconds to wait by
#       'data=N' where N is the number of seconds. Defaults to 30
#       if not specified.  See the tcp(7) man page for details.
#EXAMPLE:
## FreeBSD
#accept_filter httpready
## Linux
#accept_filter data
#Default:
# none

#  TAG: client_ip_max_connections
#       Set an absolute limit on the number of connections a single
#       client IP can use. Any more than this and Squid will begin to drop
#       new connections from the client until it closes some links.
#
#       Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP
#       connections from the client. For finer control use the ACL access controls.
#
#       Requires client_db to be enabled (the default).
#
#       WARNING: This may noticably slow down traffic received via external proxies
#       or NAT devices and cause them to rebound error messages back to their clients.
#Default:
# client_ip_max_connections -1

#  TAG: tcp_recv_bufsize        (bytes)
#       Size of receive buffer to set for TCP sockets.  Probably just
#       as easy to change your kernel's default.  Set to zero to use
#       the default buffer size.
#Default:
# tcp_recv_bufsize 0 bytes

# ICAP OPTIONS
# -----------------------------------------------------------------------------

#  TAG: icap_enable     on|off
#       If you want to enable the ICAP module support, set this to on.
#Default:
# icap_enable off

#  TAG: icap_connect_timeout
#       This parameter specifies how long to wait for the TCP connect to
#       the requested ICAP server to complete before giving up and either
#       terminating the HTTP transaction or bypassing the failure.
#
#       The default for optional services is peer_connect_timeout.
#       The default for essential services is connect_timeout.
#       If this option is explicitly set, its value applies to all services.
#Default:
# none

#  TAG: icap_io_timeout time-units
#       This parameter specifies how long to wait for an I/O activity on
#       an established, active ICAP connection before giving up and
#       either terminating the HTTP transaction or bypassing the
#       failure.
#
#       The default is read_timeout.
#Default:
# none

#  TAG: icap_service_failure_limit
#       The limit specifies the number of failures that Squid tolerates
#       when establishing a new TCP connection with an ICAP service. If
#       the number of failures exceeds the limit, the ICAP service is
#       not used for new ICAP requests until it is time to refresh its
#       OPTIONS. The per-service failure counter is reset to zero each
#       time Squid fetches new service OPTIONS.
#
#       A negative value disables the limit. Without the limit, an ICAP
#       service will not be considered down due to connectivity failures
#       between ICAP OPTIONS requests.
#Default:
# icap_service_failure_limit 10

#  TAG: icap_service_revival_delay
#       The delay specifies the number of seconds to wait after an ICAP
#       OPTIONS request failure before requesting the options again. The
#       failed ICAP service is considered "down" until fresh OPTIONS are
#       fetched.
#
#       The actual delay cannot be smaller than the hardcoded minimum
#       delay of 30 seconds.
#Default:
# icap_service_revival_delay 180

#  TAG: icap_preview_enable     on|off
#       The ICAP Preview feature allows the ICAP server to handle the
#       HTTP message by looking only at the beginning of the message body
#       or even without receiving the body at all. In some environments, 
#       previews greatly speedup ICAP processing.
#
#       During an ICAP OPTIONS transaction, the server may tell Squid what
#       HTTP messages should be previewed and how big the preview should be.
#       Squid will not use Preview if the server did not request one.
#
#       To disable ICAP Preview for all ICAP services, regardless of
#       individual ICAP server OPTIONS responses, set this option to "off".
#Example:
#icap_preview_enable off
#Default:
# icap_preview_enable on

#  TAG: icap_preview_size
#       The default size of preview data to be sent to the ICAP server.
#       -1 means no preview. This value might be overwritten on a per server
#       basis by OPTIONS requests.
#Default:
# icap_preview_size -1

#  TAG: icap_default_options_ttl
#       The default TTL value for ICAP OPTIONS responses that don't have
#       an Options-TTL header.
#Default:
# icap_default_options_ttl 60

#  TAG: icap_persistent_connections     on|off
#       Whether or not Squid should use persistent connections to
#       an ICAP server.
#Default:
# icap_persistent_connections on

#  TAG: icap_send_client_ip     on|off
#       This adds the header "X-Client-IP" to ICAP requests.
#Default:
# icap_send_client_ip off

#  TAG: icap_send_client_username       on|off
#       This sends authenticated HTTP client username (if available) to
#       the ICAP service. The username value is encoded based on the
#       icap_client_username_encode option and is sent using the header
#       specified by the icap_client_username_header option.
#Default:
# icap_send_client_username off

#  TAG: icap_client_username_header
#       ICAP request header name to use for send_client_username.
#Default:
# icap_client_username_header X-Client-Username

#  TAG: icap_client_username_encode     on|off
#       Whether to base64 encode the authenticated client username.
#Default:
# icap_client_username_encode off

#  TAG: icap_service
#       Defines a single ICAP service using the following format:
#
#       icap_service service_name vectoring_point [options] service_url
#
#       service_name: ID
#               an opaque identifier which must be unique in squid.conf
#
#       vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
#               This specifies at which point of transaction processing the
#               ICAP service should be activated. *_postcache vectoring points
#               are not yet supported.
#
#       service_url: icap://servername:port/servicepath
#               ICAP server and service location.
#
#       ICAP does not allow a single service to handle both REQMOD and RESPMOD
#       transactions. Squid does not enforce that requirement. You can specify
#       services with the same service_url and different vectoring_points. You
#       can even specify multiple identical services as long as their
#       service_names differ.
#
#
#       Service options are separated by white space. ICAP services support
#       the following name=value options:
#
#       bypass=on|off|1|0
#               If set to 'on' or '1', the ICAP service is treated as
#               optional. If the service cannot be reached or malfunctions,
#               Squid will try to ignore any errors and process the message as
#               if the service was not enabled. No all ICAP errors can be
#               bypassed.  If set to 0, the ICAP service is treated as
#               essential and all ICAP errors will result in an error page
#               returned to the HTTP client.
#
#               Bypass is off by default: services are treated as essential.
#
#       routing=on|off|1|0
#               If set to 'on' or '1', the ICAP service is allowed to
#               dynamically change the current message adaptation plan by
#               returning a chain of services to be used next. The services
#               are specified using the X-Next-Services ICAP response header
#               value, formatted as a comma-separated list of service names.
#               Each named service should be configured in squid.conf and
#               should have the same method and vectoring point as the current
#               ICAP transaction.  Services violating these rules are ignored.
#               An empty X-Next-Services value results in an empty plan which
#               ends the current adaptation. 
#
#               Routing is not allowed by default: the ICAP X-Next-Services
#               response header is ignored.
#
#       Older icap_service format without optional named parameters is
#       deprecated but supported for backward compatibility.
#
#Example:
#icap_service svcBlocker reqmod_precache bypass=0 icap://icap1.mydomain.net:1344/reqmod
#icap_service svcLogger reqmod_precache routing=on icap://icap2.mydomain.net:1344/respmod
#Default:
# none

#  TAG: icap_class
#       This deprecated option was documented to define an ICAP service
#       chain, even though it actually defined a set of similar, redundant
#       services, and the chains were not supported. 
#
#       To define a set of redundant services, please use the
#       adaptation_service_set directive. For service chains, use
#       adaptation_service_chain.
#Default:
# none

#  TAG: icap_access
#       This option is deprecated. Please use adaptation_access, which
#       has the same ICAP functionality, but comes with better
#       documentation, and eCAP support.
#Default:
# none

# eCAP OPTIONS
# -----------------------------------------------------------------------------

#  TAG: ecap_enable     on|off
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ecap option
#
#       Controls whether eCAP support is enabled.
#Default:
# ecap_enable off

#  TAG: ecap_service
# Note: This option is only available if Squid is rebuilt with the
#       --enable-ecap option
#
#       Defines a single eCAP service
#
#       ecap_service servicename vectoring_point bypass service_url
#
#       vectoring_point = reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache
#               This specifies at which point of transaction processing the
#               eCAP service should be activated. *_postcache vectoring points
#               are not yet supported.
#       bypass = 1|0
#               If set to 1, the eCAP service is treated as optional. If the
#               service cannot be reached or malfunctions, Squid will try to
#               ignore any errors and process the message as if the service
#               was not enabled. No all eCAP errors can be bypassed.
#               If set to 0, the eCAP service is treated as essential and all
#               eCAP errors will result in an error page returned to the
#               HTTP client.
#       service_url = ecap://vendor/service_name?custom&cgi=style&parameters=optional
#
#Example:
#ecap_service service_1 reqmod_precache 0 ecap://filters-R-us/leakDetector?on_error=block
#ecap_service service_2 respmod_precache 1 icap://filters-R-us/virusFilter?config=/etc/vf.cfg
#Default:
# none

#  TAG: loadable_modules
#       Instructs Squid to load the specified dynamic module(s) or activate
#       preloaded module(s).
#Example:
#loadable_modules /usr/lib/MinimalAdapter.so
#Default:
# none

# MESSAGE ADAPTATION OPTIONS
# -----------------------------------------------------------------------------

#  TAG: adaptation_service_set
#
#       Configures an ordered set of similar, redundant services. This is
#       useful when hot standby or backup adaptation servers are available.
#
#           adaptation_service_set set_name service_name1 service_name2 ...
#
#       The named services are used in the set declaration order. The first
#       applicable adaptation service from the set is used first. The next
#       applicable service is tried if and only if the transaction with the
#       previous service fails and the message waiting to be adapted is still
#       intact.
#
#       When adaptation starts, broken services are ignored as if they were
#       not a part of the set. A broken service is a down optional service.
#
#       The services in a set must be attached to the same vectoring point
#       (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
#
#       If all services in a set are optional then adaptation failures are
#       bypassable. If all services in the set are essential, then a
#       transaction failure with one service may still be retried using
#       another service from the set, but when all services fail, the master
#       transaction fails as well.
#
#       A set may contain a mix of optional and essential services, but that
#       is likely to lead to surprising results because broken services become
#       ignored (see above), making previously bypassable failures fatal.
#       Technically, it is the bypassability of the last failed service that
#       matters.
#
#       See also: adaptation_access adaptation_service_chain
#
#Example:
#adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup
#adaptation service_set svcLogger loggerLocal loggerRemote
#Default:
# none

#  TAG: adaptation_service_chain
#
#       Configures a list of complementary services that will be applied
#       one-by-one, forming an adaptation chain or pipeline. This is useful
#       when Squid must perform different adaptations on the same message.
#
#           adaptation_service_chain chain_name service_name1 svc_name2 ...
#
#       The named services are used in the chain declaration order. The first
#       applicable adaptation service from the chain is used first. The next
#       applicable service is applied to the successful adaptation results of
#       the previous service in the chain.
#
#       When adaptation starts, broken services are ignored as if they were
#       not a part of the chain. A broken service is a down optional service.
#
#       Request satisfaction terminates the adaptation chain because Squid
#       does not currently allow declaration of RESPMOD services at the
#       "reqmod_precache" vectoring point (see icap_service or ecap_service).
#
#       The services in a chain must be attached to the same vectoring point
#       (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD).
#
#       A chain may contain a mix of optional and essential services. If an
#       essential adaptation fails (or the failure cannot be bypassed for
#       other reasons), the master transaction fails. Otherwise, the failure
#       is bypassed as if the failed adaptation service was not in the chain.
#
#       See also: adaptation_access adaptation_service_set
#
#Example:
#adaptation_service_chain svcRequest requestLogger urlFilter leakDetector
#Default:
# none

#  TAG: adaptation_access
#       Sends an HTTP transaction to an ICAP or eCAP adaptation service.
#
#       adaptation_access service_name allow|deny [!]aclname...
#       adaptation_access set_name     allow|deny [!]aclname...
#
#       At each supported vectoring point, the adaptation_access
#       statements are processed in the order they appear in this
#       configuration file. Statements pointing to the following services
#       are ignored (i.e., skipped without checking their ACL):
#
#           - services serving different vectoring points
#           - "broken-but-bypassable" services
#           - "up" services configured to ignore such transactions
#              (e.g., based on the ICAP Transfer-Ignore header).
#
#        When a set_name is used, all services in the set are checked
#       using the same rules, to find the first applicable one. See
#       adaptation_service_set for details.
#
#       If an access list is checked and there is a match, the
#       processing stops: For an "allow" rule, the corresponding
#       adaptation service is used for the transaction. For a "deny"
#       rule, no adaptation service is activated.
#
#       It is currently not possible to apply more than one adaptation
#       service at the same vectoring point to the same HTTP transaction.
#
#        See also: icap_service and ecap_service
#
#Example:
#adaptation_access service_1 allow all
#Default:
# none

#  TAG: adaptation_service_iteration_limit
#       Limits the number of iterations allowed when applying adaptation
#       services to a message. If your longest adaptation set or chain
#       may have more than 16 services, increase the limit beyond its
#       default value of 16. If detecting infinite iteration loops sooner
#       is critical, make the iteration limit match the actual number
#       of services in your longest adaptation set or chain.
#
#       Infinite adaptation loops are most likely with routing services.
#
#       See also: icap_service routing=1
#Default:
# adaptation_service_iteration_limit 16

#  TAG: adaptation_masterx_shared_names
#       For each master transaction (i.e., the HTTP request and response
#       sequence, including all related ICAP and eCAP exchanges), Squid
#       maintains a table of metadata. The table entries are (name, value)
#       pairs shared among eCAP and ICAP exchanges. The table is destroyed
#       with the master transaction.
#
#       This option specifies the table entry names that Squid must accept
#       from and forward to the adaptation transactions.
#
#       An ICAP REQMOD or RESPMOD transaction may set an entry in the 
#       shared table by returning an ICAP header field with a name 
#       specified in adaptation_masterx_shared_names. Squid will store 
#       and forward that ICAP header field to subsequent ICAP 
#       transactions within the same master transaction scope.
#
#       Only one shared entry name is supported at this time.
#
#Example:
## share authentication information among ICAP services
#adaptation_masterx_shared_names X-Subscriber-ID
#Default:
# none

#  TAG: icap_retry
#       This ACL determines which retriable ICAP transactions are
#       retried. Transactions that received a complete ICAP response
#       and did not have to consume or produce HTTP bodies to receive
#       that response are usually retriable.
#
#       icap_retry allow|deny [!]aclname ...
#
#       Squid automatically retries some ICAP I/O timeouts and errors
#       due to persistent connection race conditions.
#
#       See also: icap_retry_limit
#Default:
# icap_retry deny all

#  TAG: icap_retry_limit
#       Limits the number of retries allowed. When set to zero (default),
#       no retries are allowed.
#
#       Communication errors due to persistent connection race
#       conditions are unavoidable, automatically retried, and do not
#       count against this limit.
#
#       See also: icap_retry
#Default:
# icap_retry_limit 0

# DNS OPTIONS
# -----------------------------------------------------------------------------

#  TAG: check_hostnames
#       For security and stability reasons Squid can check
#       hostnames for Internet standard RFC compliance. If you want
#       Squid to perform these checks turn this directive on.
#Default:
# check_hostnames off

#  TAG: allow_underscore
#       Underscore characters is not strictly allowed in Internet hostnames
#       but nevertheless used by many sites. Set this to off if you want
#       Squid to be strict about the standard.
#       This check is performed only when check_hostnames is set to on.
#Default:
# allow_underscore on

#  TAG: cache_dns_program
# Note: This option is only available if Squid is rebuilt with the
#       --disable-internal-dns option
#
#       Specify the location of the executable for dnslookup process.
#Default:
# cache_dns_program /usr/lib/squid3/dnsserver

#  TAG: dns_children
# Note: This option is only available if Squid is rebuilt with the
#       --disable-internal-dns option
#
#       The number of processes spawn to service DNS name lookups.
#       For heavily loaded caches on large servers, you should
#       probably increase this value to at least 10.  The maximum
#       is 32.  The default is 5.
#
#       You must have at least one dnsserver process.
#Default:
# dns_children 5

#  TAG: dns_retransmit_interval
#       Initial retransmit interval for DNS queries. The interval is
#       doubled each time all configured DNS servers have been tried.
#
#Default:
# dns_retransmit_interval 5 seconds

#  TAG: dns_timeout
#       DNS Query timeout. If no response is received to a DNS query
#       within this time all DNS servers for the queried domain
#       are assumed to be unavailable.
#Default:
# dns_timeout 2 minutes

#  TAG: dns_defnames    on|off
#       Normally the RES_DEFNAMES resolver option is disabled
#       (see res_init(3)).  This prevents caches in a hierarchy
#       from interpreting single-component hostnames locally.  To allow
#       Squid to handle single-component names, enable this option.
#Default:
# dns_defnames off

#  TAG: dns_nameservers
#       Use this if you want to specify a list of DNS name servers
#       (IP addresses) to use instead of those given in your
#       /etc/resolv.conf file.
#       On Windows platforms, if no value is specified here or in
#       the /etc/resolv.conf file, the list of DNS name servers are
#       taken from the Windows registry, both static and dynamic DHCP
#       configurations are supported.
#
#       Example: dns_nameservers 10.0.0.1 192.172.0.4
#Default:
# none

#  TAG: hosts_file
#       Location of the host-local IP name-address associations
#       database. Most Operating Systems have such a file on different
#       default locations:
#       - Un*X & Linux:    /etc/hosts
#       - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts
#                          (%SystemRoot% value install default is c:\winnt)
#       - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts
#                          (%SystemRoot% value install default is c:\windows)
#       - Windows 9x/Me:   %windir%\hosts
#                          (%windir% value is usually c:\windows)
#       - Cygwin:          /etc/hosts
#
#       The file contains newline-separated definitions, in the
#       form ip_address_in_dotted_form name [name ...] names are
#       whitespace-separated. Lines beginning with an hash (#)
#       character are comments.
#
#       The file is checked at startup and upon configuration.
#       If set to 'none', it won't be checked.
#       If append_domain is used, that domain will be added to
#       domain-local (i.e. not containing any dot character) host
#       definitions.
#Default:
# hosts_file /etc/hosts

#  TAG: append_domain
#       Appends local domain name to hostnames without any dots in
#       them.  append_domain must begin with a period.
#
#       Be warned there are now Internet names with no dots in
#       them using only top-domain names, so setting this may
#       cause some Internet sites to become unavailable.
#
#Example:
# append_domain .yourdomain.com
#Default:
# none

#  TAG: ignore_unknown_nameservers
#       By default Squid checks that DNS responses are received
#       from the same IP addresses they are sent to.  If they
#       don't match, Squid ignores the response and writes a warning
#       message to cache.log.  You can allow responses from unknown
#       nameservers by setting this option to 'off'.
#Default:
# ignore_unknown_nameservers on

#  TAG: dns_v4_fallback
#       Standard practice with DNS is to lookup either A or AAAA records
#       and use the results if it succeeds. Only looking up the other if
#       the first attempt fails or otherwise produces no results.
#
#       That policy however will cause squid to produce error pages for some
#       servers that advertise AAAA but are unreachable over IPv6.
#
#       If this is ON  squid will always lookup both AAAA and A, using both.
#       If this is OFF squid will lookup AAAA and only try A if none found.
#
#       WARNING: There are some possibly unwanted side-effects with this on:
#               *) Doubles the load placed by squid on the DNS network.
#               *) May negatively impact connection delay times.
#Default:
# dns_v4_fallback on

#  TAG: ipcache_size    (number of entries)
#  TAG: ipcache_low     (percent)
#  TAG: ipcache_high    (percent)
#       The size, low-, and high-water marks for the IP cache.
#Default:
# ipcache_size 1024
# ipcache_low 90
# ipcache_high 95

#  TAG: fqdncache_size  (number of entries)
#       Maximum number of FQDN cache entries.
#Default:
# fqdncache_size 1024

# MISCELLANEOUS
# -----------------------------------------------------------------------------

#  TAG: memory_pools    on|off
#       If set, Squid will keep pools of allocated (but unused) memory
#       available for future use.  If memory is a premium on your
#       system and you believe your malloc library outperforms Squid
#       routines, disable this.
#Default:
# memory_pools on

#  TAG: memory_pools_limit      (bytes)
#       Used only with memory_pools on:
#       memory_pools_limit 50 MB
#
#       If set to a non-zero value, Squid will keep at most the specified
#       limit of allocated (but unused) memory in memory pools. All free()
#       requests that exceed this limit will be handled by your malloc
#       library. Squid does not pre-allocate any memory, just safe-keeps
#       objects that otherwise would be free()d. Thus, it is safe to set
#       memory_pools_limit to a reasonably high value even if your
#       configuration will use less memory.
#
#       If set to none, Squid will keep all memory it can. That is, there
#       will be no limit on the total amount of memory used for safe-keeping.
#
#       To disable memory allocation optimization, do not set
#       memory_pools_limit to 0 or none. Set memory_pools to "off" instead.
#
#       An overhead for maintaining memory pools is not taken into account
#       when the limit is checked. This overhead is close to four bytes per
#       object kept. However, pools may actually _save_ memory because of
#       reduced memory thrashing in your malloc library.
#Default:
# memory_pools_limit 5 MB

#  TAG: forwarded_for   on|off|transparent|truncate|delete
#       If set to "on", Squid will append your client's IP address
#       in the HTTP requests it forwards. By default it looks like:
#
#               X-Forwarded-For: 192.1.2.3
#
#       If set to "off", it will appear as
#
#               X-Forwarded-For: unknown
#
#       If set to "transparent", Squid will not alter the
#       X-Forwarded-For header in any way.
#
#       If set to "delete", Squid will delete the entire
#       X-Forwarded-For header.
#
#       If set to "truncate", Squid will remove all existing
#       X-Forwarded-For entries, and place itself as the sole entry.
#Default:
# forwarded_for on

#  TAG: cachemgr_passwd
#       Specify passwords for cachemgr operations.
#
#       Usage: cachemgr_passwd password action action ...
#
#       Some valid actions are (see cache manager menu for a full list):
#               5min
#               60min
#               asndb
#               authenticator
#               cbdata
#               client_list
#               comm_incoming
#               config *
#               counters
#               delay
#               digest_stats
#               dns
#               events
#               filedescriptors
#               fqdncache
#               histograms
#               http_headers
#               info
#               io
#               ipcache
#               mem
#               menu
#               netdb
#               non_peers
#               objects
#               offline_toggle *
#               pconn
#               peer_select
#               reconfigure *
#               redirector
#               refresh
#               server_list
#               shutdown *
#               store_digest
#               storedir
#               utilization
#               via_headers
#               vm_objects
#
#       * Indicates actions which will not be performed without a
#         valid password, others can be performed if not listed here.
#
#       To disable an action, set the password to "disable".
#       To allow performing an action without a password, set the
#       password to "none".
#
#       Use the keyword "all" to set the same password for all actions.
#
#Example:
# cachemgr_passwd secret shutdown
# cachemgr_passwd lesssssssecret info stats/objects
# cachemgr_passwd disable all
#Default:
# none

#  TAG: client_db       on|off
#       If you want to disable collecting per-client statistics,
#       turn off client_db here.
#Default:
# client_db on

#  TAG: refresh_all_ims on|off
#       When you enable this option, squid will always check
#       the origin server for an update when a client sends an
#       If-Modified-Since request.  Many browsers use IMS
#       requests when the user requests a reload, and this
#       ensures those clients receive the latest version.
#
#       By default (off), squid may return a Not Modified response
#       based on the age of the cached version.
#Default:
# refresh_all_ims off

#  TAG: reload_into_ims on|off
#       When you enable this option, client no-cache or ``reload''
#       requests will be changed to If-Modified-Since requests.
#       Doing this VIOLATES the HTTP standard.  Enabling this
#       feature could make you liable for problems which it
#       causes.
#
#       see also refresh_pattern for a more selective approach.
#Default:
# reload_into_ims off

#  TAG: maximum_single_addr_tries
#       This sets the maximum number of connection attempts for a
#       host that only has one address (for multiple-address hosts,
#       each address is tried once).
#
#       The default value is one attempt, the (not recommended)
#       maximum is 255 tries.  A warning message will be generated
#       if it is set to a value greater than ten.
#
#       Note: This is in addition to the request re-forwarding which
#       takes place if Squid fails to get a satisfying response.
#Default:
# maximum_single_addr_tries 1

#  TAG: retry_on_error
#       If set to on Squid will automatically retry requests when
#       receiving an error response. This is mainly useful if you
#       are in a complex cache hierarchy to work around access
#       control errors.
#Default:
# retry_on_error off

#  TAG: as_whois_server
#       WHOIS server to query for AS numbers.  NOTE: AS numbers are
#       queried only when Squid starts up, not for every request.
#Default:
# as_whois_server whois.ra.net
# as_whois_server whois.ra.net

#  TAG: offline_mode
#       Enable this option and Squid will never try to validate cached
#       objects.
#Default:
# offline_mode off

#  TAG: uri_whitespace
#       What to do with requests that have whitespace characters in the
#       URI.  Options:
#
#       strip:  The whitespace characters are stripped out of the URL.
#               This is the behavior recommended by RFC2396.
#       deny:   The request is denied.  The user receives an "Invalid
#               Request" message.
#       allow:  The request is allowed and the URI is not changed.  The
#               whitespace characters remain in the URI.  Note the
#               whitespace is passed to redirector processes if they
#               are in use.
#       encode: The request is allowed and the whitespace characters are
#               encoded according to RFC1738.  This could be considered
#               a violation of the HTTP/1.1
#               RFC because proxies are not allowed to rewrite URI's.
#       chop:   The request is allowed and the URI is chopped at the
#               first whitespace.  This might also be considered a
#               violation.
#Default:
# uri_whitespace strip

#  TAG: chroot
#       Specifies a directory where Squid should do a chroot() while
#       initializing.  This also causes Squid to fully drop root
#       privileges after initializing.  This means, for example, if you
#       use a HTTP port less than 1024 and try to reconfigure, you may
#       get an error saying that Squid can not open the port.
#Default:
# none

#  TAG: balance_on_multiple_ip
#       Modern IP resolvers in squid sort lookup results by preferred access.
#       By default squid will use these IP in order and only rotates to
#       the next listed when the most preffered fails.
#
#       Some load balancing servers based on round robin DNS have been
#       found not to preserve user session state across requests
#       to different IP addresses.
#
#       Enabling this directive Squid rotates IP's per request.
#Default:
# balance_on_multiple_ip off

#  TAG: pipeline_prefetch
#       To boost the performance of pipelined requests to closer
#       match that of a non-proxied environment Squid can try to fetch
#       up to two requests in parallel from a pipeline.
#
#       Defaults to off for bandwidth management and access logging
#       reasons.
#Default:
# pipeline_prefetch off

#  TAG: high_response_time_warning      (msec)
#       If the one-minute median response time exceeds this value,
#       Squid prints a WARNING with debug level 0 to get the
#       administrators attention.  The value is in milliseconds.
#Default:
# high_response_time_warning 0

#  TAG: high_page_fault_warning
#       If the one-minute average page fault rate exceeds this
#       value, Squid prints a WARNING with debug level 0 to get
#       the administrators attention.  The value is in page faults
#       per second.
#Default:
# high_page_fault_warning 0

#  TAG: high_memory_warning
#       If the memory usage (as determined by mallinfo) exceeds
#       this amount, Squid prints a WARNING with debug level 0 to get
#       the administrators attention.
#Default:
# high_memory_warning 0 KB

#  TAG: sleep_after_fork        (microseconds)
#       When this is set to a non-zero value, the main Squid process
#       sleeps the specified number of microseconds after a fork()
#       system call. This sleep may help the situation where your
#       system reports fork() failures due to lack of (virtual)
#       memory. Note, however, if you have a lot of child
#       processes, these sleep delays will add up and your
#       Squid will not service requests for some amount of time
#       until all the child processes have been started.
#       On Windows value less then 1000 (1 milliseconds) are
#       rounded to 1000.
#Default:
# sleep_after_fork 0

#  TAG: windows_ipaddrchangemonitor     on|off
#       On Windows Squid by default will monitor IP address changes and will 
#       reconfigure itself after any detected event. This is very useful for
#       proxies connected to internet with dial-up interfaces.
#       In some cases (a Proxy server acting as VPN gateway is one) it could be
#       desiderable to disable this behaviour setting this to 'off'.
#       Note: after changing this, Squid service must be restarted.
#Default:
# windows_ipaddrchangemonitor on

#  TAG: max_filedescriptors
#       The maximum number of filedescriptors supported.
#
#       The default "0" means Squid inherits the current ulimit setting.
#
#       Note: Changing this requires a restart of Squid. Also
#       not all comm loops supports large values.
#Default:
# max_filedescriptors 0