1 ;;; url-http.el --- HTTP retrieval routines
3 ;; Copyright (C) 1999, 2001, 2004-2013 Free Software Foundation, Inc.
5 ;; Author: Bill Perry <wmperry@gnu.org>
6 ;; Keywords: comm, data, processes
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27 (eval-when-compile (require 'cl-lib
))
29 (defvar url-callback-arguments
)
30 (defvar url-callback-function
)
31 (defvar url-current-object
)
32 (defvar url-http-after-change-function
)
33 (defvar url-http-chunked-counter
)
34 (defvar url-http-chunked-length
)
35 (defvar url-http-chunked-start
)
36 (defvar url-http-connection-opened
)
37 (defvar url-http-content-length
)
38 (defvar url-http-content-type
)
39 (defvar url-http-data
)
40 (defvar url-http-end-of-headers
)
41 (defvar url-http-extra-headers
)
42 (defvar url-http-method
)
43 (defvar url-http-no-retry
)
44 (defvar url-http-process
)
45 (defvar url-http-proxy
)
46 (defvar url-http-response-status
)
47 (defvar url-http-response-version
)
48 (defvar url-http-target-url
)
49 (defvar url-http-transfer-encoding
)
50 (defvar url-http-end-of-headers
)
51 (defvar url-show-status
)
60 (autoload 'url-cache-create-filename
"url-cache")
62 (defconst url-http-default-port
80 "Default HTTP port.")
63 (defconst url-http-asynchronous-p t
"HTTP retrievals are asynchronous.")
64 (defalias 'url-http-expand-file-name
'url-default-expander
)
66 (defvar url-http-real-basic-auth-storage nil
)
67 (defvar url-http-proxy-basic-auth-storage nil
)
69 (defvar url-http-open-connections
(make-hash-table :test
'equal
71 "A hash table of all open network connections.")
73 (defvar url-http-version
"1.1"
74 "What version of HTTP we advertise, as a string.
75 Valid values are 1.1 and 1.0.
76 This is only useful when debugging the HTTP subsystem.
78 Setting this to 1.0 will tell servers not to send chunked encoding,
79 and other HTTP/1.1 specific features.")
81 (defvar url-http-attempt-keepalives t
82 "Whether to use a single TCP connection multiple times in HTTP.
83 This is only useful when debugging the HTTP subsystem. Setting to
84 nil will explicitly close the connection to the server after every
87 (defconst url-http-codes
88 '((100 continue
"Continue with request")
89 (101 switching-protocols
"Switching protocols")
90 (102 processing
"Processing (Added by DAV)")
92 (201 created
"Created")
93 (202 accepted
"Accepted")
94 (203 non-authoritative
"Non-authoritative information")
95 (204 no-content
"No content")
96 (205 reset-content
"Reset content")
97 (206 partial-content
"Partial content")
98 (207 multi-status
"Multi-status (Added by DAV)")
99 (300 multiple-choices
"Multiple choices")
100 (301 moved-permanently
"Moved permanently")
102 (303 see-other
"See other")
103 (304 not-modified
"Not modified")
104 (305 use-proxy
"Use proxy")
105 (307 temporary-redirect
"Temporary redirect")
106 (400 bad-request
"Bad Request")
107 (401 unauthorized
"Unauthorized")
108 (402 payment-required
"Payment required")
109 (403 forbidden
"Forbidden")
110 (404 not-found
"Not found")
111 (405 method-not-allowed
"Method not allowed")
112 (406 not-acceptable
"Not acceptable")
113 (407 proxy-authentication-required
"Proxy authentication required")
114 (408 request-timeout
"Request time-out")
115 (409 conflict
"Conflict")
117 (411 length-required
"Length required")
118 (412 precondition-failed
"Precondition failed")
119 (413 request-entity-too-large
"Request entity too large")
120 (414 request-uri-too-large
"Request-URI too large")
121 (415 unsupported-media-type
"Unsupported media type")
122 (416 requested-range-not-satisfiable
"Requested range not satisfiable")
123 (417 expectation-failed
"Expectation failed")
124 (422 unprocessable-entity
"Unprocessable Entity (Added by DAV)")
125 (423 locked
"Locked")
126 (424 failed-Dependency
"Failed Dependency")
127 (500 internal-server-error
"Internal server error")
128 (501 not-implemented
"Not implemented")
129 (502 bad-gateway
"Bad gateway")
130 (503 service-unavailable
"Service unavailable")
131 (504 gateway-timeout
"Gateway time-out")
132 (505 http-version-not-supported
"HTTP version not supported")
133 (507 insufficient-storage
"Insufficient storage"))
134 "The HTTP return codes and their text.")
137 ;; These are all macros so that they are hidden from external sight
138 ;; when the file is byte-compiled.
140 ;; This allows us to expose just the entry points we want.
142 ;; These routines will allow us to implement persistent HTTP
144 (defsubst url-http-debug
(&rest args
)
146 (let ((proc (get-buffer-process (current-buffer))))
147 ;; The user hit C-g, honor it! Some things can get in an
148 ;; incredibly tight loop (chunked encoding)
151 (set-process-sentinel proc nil
)
152 (set-process-filter proc nil
)))
153 (error "Transfer interrupted!")))
154 (apply 'url-debug
'http args
))
156 (defun url-http-mark-connection-as-busy (host port proc
)
157 (url-http-debug "Marking connection as busy: %s:%d %S" host port proc
)
158 (set-process-query-on-exit-flag proc t
)
159 (puthash (cons host port
)
160 (delq proc
(gethash (cons host port
) url-http-open-connections
))
161 url-http-open-connections
)
164 (defun url-http-mark-connection-as-free (host port proc
)
165 (url-http-debug "Marking connection as free: %s:%d %S" host port proc
)
166 (when (memq (process-status proc
) '(open run connect
))
167 (set-process-buffer proc nil
)
168 (set-process-sentinel proc
'url-http-idle-sentinel
)
169 (set-process-query-on-exit-flag proc nil
)
170 (puthash (cons host port
)
171 (cons proc
(gethash (cons host port
) url-http-open-connections
))
172 url-http-open-connections
))
175 (defun url-http-find-free-connection (host port
)
176 (let ((conns (gethash (cons host port
) url-http-open-connections
))
178 (while (and conns
(not connection
))
179 (if (not (memq (process-status (car conns
)) '(run open connect
)))
181 (url-http-debug "Cleaning up dead process: %s:%d %S"
182 host port
(car conns
))
183 (url-http-idle-sentinel (car conns
) nil
))
184 (setq connection
(car conns
))
185 (url-http-debug "Found existing connection: %s:%d %S" host port connection
))
188 (url-http-debug "Reusing existing connection: %s:%d" host port
)
189 (url-http-debug "Contacting host: %s:%d" host port
))
190 (url-lazy-message "Contacting host: %s:%d" host port
)
193 (let ((buf (generate-new-buffer " *url-http-temp*")))
194 ;; `url-open-stream' needs a buffer in which to do things
195 ;; like authentication. But we use another buffer afterwards.
197 (let ((proc (url-open-stream host buf host port
)))
198 ;; url-open-stream might return nil.
199 (when (processp proc
)
200 ;; Drop the temp buffer link before killing the buffer.
201 (set-process-buffer proc nil
)
202 (setq connection proc
)))
203 ;; If there was an error on connect, make sure we don't
205 (when (get-buffer-process buf
)
206 (set-process-query-on-exit-flag (get-buffer-process buf
) nil
))
210 (url-http-mark-connection-as-busy host port connection
))))
212 ;; Building an HTTP request
213 (defun url-http-user-agent-string ()
214 (if (or (eq url-privacy-level
'paranoid
)
215 (and (listp url-privacy-level
)
216 (memq 'agent url-privacy-level
)))
218 (format "User-Agent: %sURL/%s\r\n"
220 (concat url-package-name
"/" url-package-version
" ")
224 (defun url-http-create-request (&optional ref-url
)
225 "Create an HTTP request for `url-http-target-url', referred to by REF-URL."
226 (let* ((extra-headers)
228 (no-cache (cdr-safe (assoc "Pragma" url-http-extra-headers
)))
229 (using-proxy url-http-proxy
)
230 (proxy-auth (if (or (cdr-safe (assoc "Proxy-Authorization"
231 url-http-extra-headers
))
234 (let ((url-basic-auth-storage
235 'url-http-proxy-basic-auth-storage
))
236 (url-get-authentication url-http-proxy nil
'any nil
))))
237 (real-fname (url-filename url-http-target-url
))
238 (host (url-host url-http-target-url
))
239 (auth (if (cdr-safe (assoc "Authorization" url-http-extra-headers
))
241 (url-get-authentication (or
242 (and (boundp 'proxy-info
)
244 url-http-target-url
) nil
'any nil
))))
245 (if (equal "" real-fname
)
246 (setq real-fname
"/"))
247 (setq no-cache
(and no-cache
(string-match "no-cache" no-cache
)))
249 (setq auth
(concat "Authorization: " auth
"\r\n")))
251 (setq proxy-auth
(concat "Proxy-Authorization: " proxy-auth
"\r\n")))
253 ;; Protection against stupid values in the referrer
254 (if (and ref-url
(stringp ref-url
) (or (string= ref-url
"file:nil")
255 (string= ref-url
"")))
258 ;; We do not want to expose the referrer if the user is paranoid.
259 (if (or (memq url-privacy-level
'(low high paranoid
))
260 (and (listp url-privacy-level
)
261 (memq 'lastloc url-privacy-level
)))
264 ;; url-http-extra-headers contains an assoc-list of
265 ;; header/value pairs that we need to put into the request.
266 (setq extra-headers
(mapconcat
268 (concat (car x
) ": " (cdr x
)))
269 url-http-extra-headers
"\r\n"))
270 (if (not (equal extra-headers
""))
271 (setq extra-headers
(concat extra-headers
"\r\n")))
273 ;; This was done with a call to `format'. Concatenating parts has
274 ;; the advantage of keeping the parts of each header together and
275 ;; allows us to elide null lines directly, at the cost of making
276 ;; the layout less clear.
278 ;; We used to concat directly, but if one of the strings happens
279 ;; to being multibyte (even if it only contains pure ASCII) then
280 ;; every string gets converted with `string-MAKE-multibyte' which
281 ;; turns the 127-255 codes into things like latin-1 accented chars
282 ;; (it would work right if it used `string-TO-multibyte' instead).
283 ;; So to avoid the problem we force every string to be unibyte.
285 ;; FIXME: Instead of `string-AS-unibyte' we'd want
286 ;; `string-to-unibyte', so as to properly signal an error if one
287 ;; of the strings contains a multibyte char.
292 (or url-http-method
"GET") " "
293 (if using-proxy
(url-recreate-url url-http-target-url
) real-fname
)
294 " HTTP/" url-http-version
"\r\n"
295 ;; Version of MIME we speak
296 "MIME-Version: 1.0\r\n"
297 ;; (maybe) Try to keep the connection open
298 "Connection: " (if (or using-proxy
299 (not url-http-attempt-keepalives
))
300 "close" "keep-alive") "\r\n"
301 ;; HTTP extensions we support
302 (if url-extensions-header
304 "Extension: %s\r\n" url-extensions-header
))
305 ;; Who we want to talk to
306 (if (/= (url-port url-http-target-url
)
307 (url-scheme-get-property
308 (url-type url-http-target-url
) 'default-port
))
310 "Host: %s:%d\r\n" host
(url-port url-http-target-url
))
311 (format "Host: %s\r\n" host
))
313 (if url-personal-mail-address
315 "From: " url-personal-mail-address
"\r\n"))
316 ;; Encodings we understand
317 (if url-mime-encoding-string
319 "Accept-encoding: " url-mime-encoding-string
"\r\n"))
320 (if url-mime-charset-string
322 "Accept-charset: " url-mime-charset-string
"\r\n"))
323 ;; Languages we understand
324 (if url-mime-language-string
326 "Accept-language: " url-mime-language-string
"\r\n"))
327 ;; Types we understand
328 "Accept: " (or url-mime-accept-string
"*/*") "\r\n"
330 (url-http-user-agent-string)
331 ;; Proxy Authorization
336 (when (url-use-cookies url-http-target-url
)
337 (url-cookie-generate-header-lines
339 (equal "https" (url-type url-http-target-url
))))
341 (if (and (not no-cache
)
342 (member url-http-method
'("GET" nil
)))
343 (let ((tm (url-is-cached url-http-target-url
)))
345 (concat "If-modified-since: "
346 (url-get-normalized-date tm
) "\r\n"))))
349 "Referer: " ref-url
"\r\n"))
354 "Content-length: " (number-to-string
355 (length url-http-data
))
361 ;; If `url-http-data' is nil, avoid two CRLFs (Bug#8931).
362 (if url-http-data
"\r\n")))
364 (url-http-debug "Request is: \n%s" request
)
368 (defun url-http-clean-headers ()
369 "Remove trailing \r from header lines.
370 This allows us to use `mail-fetch-field', etc.
371 Return the number of characters removed."
372 (let ((end (marker-position url-http-end-of-headers
)))
373 (goto-char (point-min))
374 (while (re-search-forward "\r$" url-http-end-of-headers t
)
376 (- end url-http-end-of-headers
)))
381 (defun url-http-handle-authentication (proxy)
382 (url-http-debug "Handling %s authentication" (if proxy
"proxy" "normal"))
383 (let ((auths (or (nreverse
385 (if proxy
"proxy-authenticate" "www-authenticate")
389 (url (url-recreate-url url-current-object
))
390 (auth-url (url-recreate-url
391 (if (and proxy
(boundp 'url-http-proxy
))
393 url-current-object
)))
394 (url-basic-auth-storage (if proxy
395 ;; Cheating, but who cares? :)
396 'url-http-proxy-basic-auth-storage
397 'url-http-real-basic-auth-storage
))
401 ;; find strongest supported auth
402 (dolist (this-auth auths
)
403 (setq this-auth
(url-eat-trailing-space
404 (url-strip-leading-spaces
407 (if (string-match "[ \t]" this-auth
)
408 (downcase (substring this-auth
0 (match-beginning 0)))
409 (downcase this-auth
)))
410 (registered (url-auth-registered this-type
))
411 (this-strength (cddr registered
)))
412 (when (and registered
(> this-strength strength
))
415 strength this-strength
))))
417 (if (not (url-auth-registered type
))
420 (goto-char (point-max))
421 (insert "<hr>Sorry, but I do not know how to handle " type
422 " authentication. If you'd like to write it,"
423 " send it to " url-bug-address
".<hr>")
425 (let* ((args (url-parse-args (subst-char-in-string ?
, ?\
; auth)))
426 (auth (url-get-authentication auth-url
427 (cdr-safe (assoc "realm" args
))
431 (push (cons (if proxy
"Proxy-Authorization" "Authorization") auth
)
432 url-http-extra-headers
)
433 (let ((url-request-method url-http-method
)
434 (url-request-data url-http-data
)
435 (url-request-extra-headers url-http-extra-headers
))
436 (url-retrieve-internal url url-callback-function
437 url-callback-arguments
)))))))
439 (defun url-http-parse-response ()
440 "Parse just the response code."
441 (if (not url-http-end-of-headers
)
442 (error "Trying to parse HTTP response code in odd buffer: %s" (buffer-name)))
443 (url-http-debug "url-http-parse-response called in (%s)" (buffer-name))
444 (goto-char (point-min))
445 (skip-chars-forward " \t\n") ; Skip any blank crap
446 (skip-chars-forward "HTTP/") ; Skip HTTP Version
447 (setq url-http-response-version
448 (buffer-substring (point)
450 (skip-chars-forward "[0-9].")
452 (setq url-http-response-status
(read (current-buffer))))
454 (defun url-http-handle-cookies ()
455 "Handle all set-cookie / set-cookie2 headers in an HTTP response.
456 The buffer must already be narrowed to the headers, so `mail-fetch-field' will
458 (let ((cookies (nreverse (mail-fetch-field "Set-Cookie" nil nil t
)))
459 (cookies2 (nreverse (mail-fetch-field "Set-Cookie2" nil nil t
))))
460 (and cookies
(url-http-debug "Found %d Set-Cookie headers" (length cookies
)))
461 (and cookies2
(url-http-debug "Found %d Set-Cookie2 headers" (length cookies2
)))
463 (url-cookie-handle-set-cookie (pop cookies
)))
465 ;;; (url-cookie-handle-set-cookie2 (pop cookies)))
469 (defun url-http-parse-headers ()
470 "Parse and handle HTTP specific headers.
471 Return t if and only if the current buffer is still active and
472 should be shown to the user."
473 ;; The comments after each status code handled are taken from RFC
475 (url-http-mark-connection-as-free (url-host url-current-object
)
476 (url-port url-current-object
)
479 (if (or (not (boundp 'url-http-end-of-headers
))
480 (not url-http-end-of-headers
))
481 (error "Trying to parse headers in odd buffer: %s" (buffer-name)))
482 (goto-char (point-min))
483 (url-http-debug "url-http-parse-headers called in (%s)" (buffer-name))
484 (url-http-parse-response)
485 (mail-narrow-to-head)
486 ;;(narrow-to-region (point-min) url-http-end-of-headers)
487 (let ((connection (mail-fetch-field "Connection")))
488 ;; In HTTP 1.0, keep the connection only if there is a
489 ;; "Connection: keep-alive" header.
490 ;; In HTTP 1.1 (and greater), keep the connection unless there is a
491 ;; "Connection: close" header
493 ((string= url-http-response-version
"1.0")
494 (unless (and connection
495 (string= (downcase connection
) "keep-alive"))
496 (delete-process url-http-process
)))
498 (when (and connection
499 (string= (downcase connection
) "close"))
500 (delete-process url-http-process
)))))
501 (let ((buffer (current-buffer))
504 ;; other status symbols: jewelry and luxury cars
505 (status-symbol (cadr (assq url-http-response-status url-http-codes
))))
506 (setq class
(/ url-http-response-status
100))
507 (url-http-debug "Parsed HTTP headers: class=%d status=%d"
508 class url-http-response-status
)
509 (when (url-use-cookies url-http-target-url
)
510 (url-http-handle-cookies))
513 ;; Classes of response codes
515 ;; 5xx = Server Error
516 ;; 4xx = Client Error
519 ;; 1xx = Informational
520 (1 ; Information messages
521 ;; 100 = Continue with request
522 ;; 101 = Switching protocols
523 ;; 102 = Processing (Added by DAV)
524 (url-mark-buffer-as-dead buffer
)
525 (error "HTTP responses in class 1xx not supported (%d)"
526 url-http-response-status
))
531 ;; 203 Non-authoritative information
534 ;; 206 Partial content
535 ;; 207 Multi-status (Added by DAV)
537 ((or `no-content
`reset-content
)
538 ;; No new data, just stay at the same document
539 (url-mark-buffer-as-dead buffer
)
542 ;; Generic success for all others. Store in the cache, and
543 ;; mark it as successful.
545 (if (and url-automatic-caching
(equal url-http-method
"GET"))
546 (url-store-in-cache buffer
))
549 ;; 300 Multiple choices
550 ;; 301 Moved permanently
555 ;; 307 Temporary redirect
556 (let ((redirect-uri (or (mail-fetch-field "Location")
557 (mail-fetch-field "URI"))))
559 (`multiple-choices
; 300
560 ;; Quoth the spec (section 10.3.1)
561 ;; -------------------------------
562 ;; The requested resource corresponds to any one of a set of
563 ;; representations, each with its own specific location and
564 ;; agent-driven negotiation information is being provided so
565 ;; that the user can select a preferred representation and
566 ;; redirect its request to that location.
568 ;; If the server has a preferred choice of representation, it
569 ;; SHOULD include the specific URI for that representation in
570 ;; the Location field; user agents MAY use the Location field
571 ;; value for automatic redirection.
572 ;; -------------------------------
573 ;; We do not support agent-driven negotiation, so we just
574 ;; redirect to the preferred URI if one is provided.
576 ((or `moved-permanently
`found
`temporary-redirect
) ; 301 302 307
577 ;; If the 301|302 status code is received in response to a
578 ;; request other than GET or HEAD, the user agent MUST NOT
579 ;; automatically redirect the request unless it can be
580 ;; confirmed by the user, since this might change the
581 ;; conditions under which the request was issued.
582 (unless (member url-http-method
'("HEAD" "GET"))
583 (setq redirect-uri nil
)))
585 ;; The response to the request can be found under a different
586 ;; URI and SHOULD be retrieved using a GET method on that
588 (setq url-http-method
"GET"
591 ;; The 304 response MUST NOT contain a message-body.
592 (url-http-debug "Extracting document from cache... (%s)"
593 (url-cache-create-filename (url-view-url t
)))
594 (url-cache-extract (url-cache-create-filename (url-view-url t
)))
595 (setq redirect-uri nil
598 ;; The requested resource MUST be accessed through the
599 ;; proxy given by the Location field. The Location field
600 ;; gives the URI of the proxy. The recipient is expected
601 ;; to repeat this single request via the proxy. 305
602 ;; responses MUST only be generated by origin servers.
603 (error "Redirection thru a proxy server not supported: %s"
606 ;; Treat everything like '300'
609 ;; Clean off any whitespace and/or <...> cruft.
610 (if (string-match "\\([^ \t]+\\)[ \t]" redirect-uri
)
611 (setq redirect-uri
(match-string 1 redirect-uri
)))
612 (if (string-match "^<\\(.*\\)>$" redirect-uri
)
613 (setq redirect-uri
(match-string 1 redirect-uri
)))
615 ;; Some stupid sites (like sourceforge) send a
616 ;; non-fully-qualified URL (ie: /), which royally confuses
618 (if (not (string-match url-nonrelative-link redirect-uri
))
619 ;; Be careful to use the real target URL, otherwise we may
620 ;; compute the redirection relative to the URL of the proxy.
622 (url-expand-file-name redirect-uri url-http-target-url
)))
623 (let ((url-request-method url-http-method
)
624 (url-request-data url-http-data
)
625 (url-request-extra-headers url-http-extra-headers
))
626 ;; Check existing number of redirects
627 (if (or (< url-max-redirections
0)
628 (and (> url-max-redirections
0)
629 (let ((events (car url-callback-arguments
))
632 (if (eq (car events
) :redirect
)
633 (setq old-redirects
(1+ old-redirects
)))
634 (and (setq events
(cdr events
))
635 (setq events
(cdr events
))))
636 (< old-redirects url-max-redirections
))))
637 ;; url-max-redirections hasn't been reached, so go
638 ;; ahead and redirect.
640 ;; Remember that the request was redirected.
641 (setf (car url-callback-arguments
)
642 (nconc (list :redirect redirect-uri
)
643 (car url-callback-arguments
)))
644 ;; Put in the current buffer a forwarding pointer to the new
645 ;; destination buffer.
646 ;; FIXME: This is a hack to fix url-retrieve-synchronously
647 ;; without changing the API. Instead url-retrieve should
648 ;; either simply not return the "destination" buffer, or it
649 ;; should take an optional `dest-buf' argument.
650 (set (make-local-variable 'url-redirect-buffer
)
651 (url-retrieve-internal
652 redirect-uri url-callback-function
653 url-callback-arguments
654 (url-silent url-current-object
)
655 (not (url-use-cookies url-current-object
))))
656 (url-mark-buffer-as-dead buffer
))
657 ;; We hit url-max-redirections, so issue an error and
659 (url-http-debug "Maximum redirections reached")
660 (setf (car url-callback-arguments
)
661 (nconc (list :error
(list 'error
'http-redirect-limit
663 (car url-callback-arguments
)))
664 (setq success t
))))))
668 ;; 402 Payment required
671 ;; 405 Method not allowed
672 ;; 406 Not acceptable
673 ;; 407 Proxy authentication required
674 ;; 408 Request time-out
677 ;; 411 Length required
678 ;; 412 Precondition failed
679 ;; 413 Request entity too large
680 ;; 414 Request-URI too large
681 ;; 415 Unsupported media type
682 ;; 416 Requested range not satisfiable
683 ;; 417 Expectation failed
684 ;; 422 Unprocessable Entity (Added by DAV)
686 ;; 424 Failed Dependency
689 ;; The request requires user authentication. The response
690 ;; MUST include a WWW-Authenticate header field containing a
691 ;; challenge applicable to the requested resource. The
692 ;; client MAY repeat the request with a suitable
693 ;; Authorization header field.
694 (url-http-handle-authentication nil
))
695 (`payment-required
; 402
696 ;; This code is reserved for future use
697 (url-mark-buffer-as-dead buffer
)
698 (error "Somebody wants you to give them money"))
700 ;; The server understood the request, but is refusing to
701 ;; fulfill it. Authorization will not help and the request
702 ;; SHOULD NOT be repeated.
707 (`method-not-allowed
; 405
708 ;; The method specified in the Request-Line is not allowed
709 ;; for the resource identified by the Request-URI. The
710 ;; response MUST include an Allow header containing a list of
711 ;; valid methods for the requested resource.
713 (`not-acceptable
; 406
714 ;; The resource identified by the request is only capable of
715 ;; generating response entities which have content
716 ;; characteristics not acceptable according to the accept
717 ;; headers sent in the request.
719 (`proxy-authentication-required
; 407
720 ;; This code is similar to 401 (Unauthorized), but indicates
721 ;; that the client must first authenticate itself with the
722 ;; proxy. The proxy MUST return a Proxy-Authenticate header
723 ;; field containing a challenge applicable to the proxy for
724 ;; the requested resource.
725 (url-http-handle-authentication t
))
726 (`request-timeout
; 408
727 ;; The client did not produce a request within the time that
728 ;; the server was prepared to wait. The client MAY repeat
729 ;; the request without modifications at any later time.
732 ;; The request could not be completed due to a conflict with
733 ;; the current state of the resource. This code is only
734 ;; allowed in situations where it is expected that the user
735 ;; might be able to resolve the conflict and resubmit the
736 ;; request. The response body SHOULD include enough
737 ;; information for the user to recognize the source of the
741 ;; The requested resource is no longer available at the
742 ;; server and no forwarding address is known.
744 (`length-required
; 411
745 ;; The server refuses to accept the request without a defined
746 ;; Content-Length. The client MAY repeat the request if it
747 ;; adds a valid Content-Length header field containing the
748 ;; length of the message-body in the request message.
750 ;; NOTE - this will never happen because
751 ;; `url-http-create-request' automatically calculates the
754 (`precondition-failed
; 412
755 ;; The precondition given in one or more of the
756 ;; request-header fields evaluated to false when it was
757 ;; tested on the server.
759 ((or `request-entity-too-large
`request-uri-too-large
) ; 413 414
760 ;; The server is refusing to process a request because the
761 ;; request entity|URI is larger than the server is willing or
764 (`unsupported-media-type
; 415
765 ;; The server is refusing to service the request because the
766 ;; entity of the request is in a format not supported by the
767 ;; requested resource for the requested method.
769 (`requested-range-not-satisfiable
; 416
770 ;; A server SHOULD return a response with this status code if
771 ;; a request included a Range request-header field, and none
772 ;; of the range-specifier values in this field overlap the
773 ;; current extent of the selected resource, and the request
774 ;; did not include an If-Range request-header field.
776 (`expectation-failed
; 417
777 ;; The expectation given in an Expect request-header field
778 ;; could not be met by this server, or, if the server is a
779 ;; proxy, the server has unambiguous evidence that the
780 ;; request could not be met by the next-hop server.
783 ;; The request could not be understood by the server due to
784 ;; malformed syntax. The client SHOULD NOT repeat the
785 ;; request without modifications.
787 ;; Tell the callback that an error occurred, and what the
790 (setf (car url-callback-arguments
)
791 (nconc (list :error
(list 'error
'http url-http-response-status
))
792 (car url-callback-arguments
)))))
794 ;; 500 Internal server error
795 ;; 501 Not implemented
797 ;; 503 Service unavailable
798 ;; 504 Gateway time-out
799 ;; 505 HTTP version not supported
800 ;; 507 Insufficient storage
802 (pcase url-http-response-status
803 (`not-implemented
; 501
804 ;; The server does not support the functionality required to
805 ;; fulfill the request.
808 ;; The server, while acting as a gateway or proxy, received
809 ;; an invalid response from the upstream server it accessed
810 ;; in attempting to fulfill the request.
812 (`service-unavailable
; 503
813 ;; The server is currently unable to handle the request due
814 ;; to a temporary overloading or maintenance of the server.
815 ;; The implication is that this is a temporary condition
816 ;; which will be alleviated after some delay. If known, the
817 ;; length of the delay MAY be indicated in a Retry-After
818 ;; header. If no Retry-After is given, the client SHOULD
819 ;; handle the response as it would for a 500 response.
821 (`gateway-timeout
; 504
822 ;; The server, while acting as a gateway or proxy, did not
823 ;; receive a timely response from the upstream server
824 ;; specified by the URI (e.g. HTTP, FTP, LDAP) or some other
825 ;; auxiliary server (e.g. DNS) it needed to access in
826 ;; attempting to complete the request.
828 (`http-version-not-supported
; 505
829 ;; The server does not support, or refuses to support, the
830 ;; HTTP protocol version that was used in the request
833 (`insufficient-storage
; 507 (DAV)
834 ;; The method could not be performed on the resource
835 ;; because the server is unable to store the representation
836 ;; needed to successfully complete the request. This
837 ;; condition is considered to be temporary. If the request
838 ;; which received this status code was the result of a user
839 ;; action, the request MUST NOT be repeated until it is
840 ;; requested by a separate user action.
842 ;; Tell the callback that an error occurred, and what the
845 (setf (car url-callback-arguments
)
846 (nconc (list :error
(list 'error
'http url-http-response-status
))
847 (car url-callback-arguments
)))))
849 (error "Unknown class of HTTP response code: %d (%d)"
850 class url-http-response-status
)))
852 (url-mark-buffer-as-dead buffer
))
853 (url-http-debug "Finished parsing HTTP headers: %S" success
)
858 (defun url-http-activate-callback ()
859 "Activate callback specified when this buffer was created."
860 (url-http-mark-connection-as-free (url-host url-current-object
)
861 (url-port url-current-object
)
863 (url-http-debug "Activating callback in buffer (%s)" (buffer-name))
864 (apply url-callback-function url-callback-arguments
))
868 ;; These unfortunately cannot be macros... please ignore them!
869 (defun url-http-idle-sentinel (proc why
)
870 "Remove (now defunct) process PROC from the list of open connections."
871 (maphash (lambda (key val
)
873 (puthash key
(delq proc val
) url-http-open-connections
)))
874 url-http-open-connections
))
876 (defun url-http-end-of-document-sentinel (proc why
)
877 ;; Sentinel used to handle (i) terminated old HTTP/0.9 connections,
878 ;; and (ii) closed connection due to reusing a HTTP connection which
879 ;; we believed was still alive, but which the server closed on us.
880 ;; We handle case (ii) by calling `url-http' again.
881 (url-http-debug "url-http-end-of-document-sentinel in buffer (%s)"
882 (process-buffer proc
))
883 (url-http-idle-sentinel proc why
)
884 (when (buffer-name (process-buffer proc
))
885 (with-current-buffer (process-buffer proc
)
886 (goto-char (point-min))
887 (cond ((not (looking-at "HTTP/"))
888 (if url-http-no-retry
889 ;; HTTP/0.9 just gets passed back no matter what
890 (url-http-activate-callback)
891 ;; Call `url-http' again if our connection expired.
893 (url-http url-current-object url-callback-function
894 url-callback-arguments
(current-buffer))))
895 ((url-http-parse-headers)
896 (url-http-activate-callback))))))
898 (defun url-http-simple-after-change-function (st nd length
)
899 ;; Function used when we do NOT know how long the document is going to be
900 ;; Just _very_ simple 'downloaded %d' type of info.
901 (url-lazy-message "Reading %s..." (url-pretty-length nd
)))
903 (defun url-http-content-length-after-change-function (st nd length
)
904 "Function used when we DO know how long the document is going to be.
905 More sophisticated percentage downloaded, etc.
906 Also does minimal parsing of HTTP headers and will actually cause
907 the callback to be triggered."
908 (if url-http-content-type
909 (url-display-percentage
910 "Reading [%s]... %s of %s (%d%%)"
911 (url-percentage (- nd url-http-end-of-headers
)
912 url-http-content-length
)
913 url-http-content-type
914 (url-pretty-length (- nd url-http-end-of-headers
))
915 (url-pretty-length url-http-content-length
)
916 (url-percentage (- nd url-http-end-of-headers
)
917 url-http-content-length
))
918 (url-display-percentage
919 "Reading... %s of %s (%d%%)"
920 (url-percentage (- nd url-http-end-of-headers
)
921 url-http-content-length
)
922 (url-pretty-length (- nd url-http-end-of-headers
))
923 (url-pretty-length url-http-content-length
)
924 (url-percentage (- nd url-http-end-of-headers
)
925 url-http-content-length
)))
927 (if (> (- nd url-http-end-of-headers
) url-http-content-length
)
929 ;; Found the end of the document! Wheee!
930 (url-display-percentage nil nil
)
931 (url-lazy-message "Reading... done.")
932 (if (url-http-parse-headers)
933 (url-http-activate-callback)))))
935 (defun url-http-chunked-encoding-after-change-function (st nd length
)
936 "Function used when dealing with 'chunked' encoding.
937 Cannot give a sophisticated percentage, but we need a different
938 function to look for the special 0-length chunk that signifies
939 the end of the document."
942 (let ((read-next-chunk t
)
945 (no-initial-crlf nil
))
946 ;; We need to loop thru looking for more chunks even within
947 ;; one after-change-function call.
948 (while read-next-chunk
949 (setq no-initial-crlf
(= 0 url-http-chunked-counter
))
950 (if url-http-content-type
951 (url-display-percentage nil
952 "Reading [%s]... chunk #%d"
953 url-http-content-type url-http-chunked-counter
)
954 (url-display-percentage nil
955 "Reading... chunk #%d"
956 url-http-chunked-counter
))
957 (url-http-debug "Reading chunk %d (%d %d %d)"
958 url-http-chunked-counter st nd length
)
959 (setq regexp
(if no-initial-crlf
960 "\\([0-9a-z]+\\).*\r?\n"
961 "\r?\n\\([0-9a-z]+\\).*\r?\n"))
963 (if url-http-chunked-start
964 ;; We know how long the chunk is supposed to be, skip over
965 ;; leading crap if possible.
966 (if (> nd
(+ url-http-chunked-start url-http-chunked-length
))
968 (url-http-debug "Got to the end of chunk #%d!"
969 url-http-chunked-counter
)
970 (goto-char (+ url-http-chunked-start
971 url-http-chunked-length
)))
972 (url-http-debug "Still need %d bytes to hit end of chunk"
973 (- (+ url-http-chunked-start
974 url-http-chunked-length
)
976 (setq read-next-chunk nil
)))
977 (if (not read-next-chunk
)
978 (url-http-debug "Still spinning for next chunk...")
979 (if no-initial-crlf
(skip-chars-forward "\r\n"))
980 (if (not (looking-at regexp
))
982 ;; Must not have received the entirety of the chunk header,
983 ;; need to spin some more.
984 (url-http-debug "Did not see start of chunk @ %d!" (point))
985 (setq read-next-chunk nil
))
986 (add-text-properties (match-beginning 0) (match-end 0)
992 (setq url-http-chunked-length
(string-to-number (buffer-substring
996 url-http-chunked-counter
(1+ url-http-chunked-counter
)
997 url-http-chunked-start
(set-marker
998 (or url-http-chunked-start
1001 ; (if (not url-http-debug)
1002 (delete-region (match-beginning 0) (match-end 0));)
1003 (url-http-debug "Saw start of chunk %d (length=%d, start=%d"
1004 url-http-chunked-counter url-http-chunked-length
1005 (marker-position url-http-chunked-start
))
1006 (if (= 0 url-http-chunked-length
)
1008 ;; Found the end of the document! Wheee!
1009 (url-http-debug "Saw end of stream chunk!")
1010 (setq read-next-chunk nil
)
1011 (url-display-percentage nil nil
)
1012 ;; Every chunk, even the last 0-length one, is
1013 ;; terminated by CRLF. Skip it.
1014 (when (looking-at "\r?\n")
1015 (url-http-debug "Removing terminator of last chunk")
1016 (delete-region (match-beginning 0) (match-end 0)))
1017 (if (re-search-forward "^\r*$" nil t
)
1018 (url-http-debug "Saw end of trailers..."))
1019 (if (url-http-parse-headers)
1020 (url-http-activate-callback))))))))))
1022 (defun url-http-wait-for-headers-change-function (st nd length
)
1023 ;; This will wait for the headers to arrive and then splice in the
1024 ;; next appropriate after-change-function, etc.
1025 (url-http-debug "url-http-wait-for-headers-change-function (%s)"
1027 (let ((end-of-headers nil
)
1029 (process-buffer (current-buffer))
1030 (content-length nil
))
1032 (goto-char (point-min))
1033 (if (and (looking-at ".*\n") ; have one line at least
1034 (not (looking-at "^HTTP/[1-9]\\.[0-9]")))
1035 ;; Not HTTP/x.y data, must be 0.9
1036 ;; God, I wish this could die.
1037 (setq end-of-headers t
1038 url-http-end-of-headers
0
1040 (when (re-search-forward "^\r*$" nil t
)
1041 ;; Saw the end of the headers
1042 (url-http-debug "Saw end of headers... (%s)" (buffer-name))
1043 (setq url-http-end-of-headers
(set-marker (make-marker)
1046 (setq nd
(- nd
(url-http-clean-headers)))))
1048 (if (not end-of-headers
)
1049 ;; Haven't seen the end of the headers yet, need to wait
1050 ;; for more data to arrive.
1053 (url-http-parse-response)
1054 (mail-narrow-to-head)
1055 (setq url-http-transfer-encoding
(mail-fetch-field
1056 "transfer-encoding")
1057 url-http-content-type
(mail-fetch-field "content-type"))
1058 (if (mail-fetch-field "content-length")
1059 (setq url-http-content-length
1060 (string-to-number (mail-fetch-field "content-length"))))
1062 (when url-http-transfer-encoding
1063 (setq url-http-transfer-encoding
1064 (downcase url-http-transfer-encoding
)))
1067 ((null url-http-response-status
)
1068 ;; We got back a headerless malformed response from the
1070 (url-http-activate-callback))
1071 ((or (= url-http-response-status
204)
1072 (= url-http-response-status
205))
1073 (url-http-debug "%d response must have headers only (%s)."
1074 url-http-response-status
(buffer-name))
1075 (when (url-http-parse-headers)
1076 (url-http-activate-callback)))
1077 ((string= "HEAD" url-http-method
)
1078 ;; A HEAD request is _ALWAYS_ terminated by the header
1079 ;; information, regardless of any entity headers,
1080 ;; according to section 4.4 of the HTTP/1.1 draft.
1081 (url-http-debug "HEAD request must have headers only (%s)."
1083 (when (url-http-parse-headers)
1084 (url-http-activate-callback)))
1085 ((string= "CONNECT" url-http-method
)
1086 ;; A CONNECT request is finished, but we cannot stick this
1087 ;; back on the free connection list
1088 (url-http-debug "CONNECT request must have headers only.")
1089 (when (url-http-parse-headers)
1090 (url-http-activate-callback)))
1091 ((equal url-http-response-status
304)
1092 ;; Only allowed to have a header section. We have to handle
1093 ;; this here instead of in url-http-parse-headers because if
1094 ;; you have a cached copy of something without a known
1095 ;; content-length, and try to retrieve it from the cache, we'd
1096 ;; fall into the 'being dumb' section and wait for the
1097 ;; connection to terminate, which means we'd wait for 10
1098 ;; seconds for the keep-alives to time out on some servers.
1099 (when (url-http-parse-headers)
1100 (url-http-activate-callback)))
1102 ;; HTTP/0.9 always signaled end-of-connection by closing the
1105 "Saw HTTP/0.9 response, connection closed means end of document.")
1106 (setq url-http-after-change-function
1107 'url-http-simple-after-change-function
))
1108 ((equal url-http-transfer-encoding
"chunked")
1109 (url-http-debug "Saw chunked encoding.")
1110 (setq url-http-after-change-function
1111 'url-http-chunked-encoding-after-change-function
)
1112 (when (> nd url-http-end-of-headers
)
1114 "Calling initial chunked-encoding for extra data at end of headers")
1115 (url-http-chunked-encoding-after-change-function
1116 (marker-position url-http-end-of-headers
) nd
1117 (- nd url-http-end-of-headers
))))
1118 ((integerp url-http-content-length
)
1120 "Got a content-length, being smart about document end.")
1121 (setq url-http-after-change-function
1122 'url-http-content-length-after-change-function
)
1124 ((= 0 url-http-content-length
)
1125 ;; We got a NULL body! Activate the callback
1128 "Got 0-length content-length, activating callback immediately.")
1129 (when (url-http-parse-headers)
1130 (url-http-activate-callback)))
1131 ((> nd url-http-end-of-headers
)
1132 ;; Have some leftover data
1133 (url-http-debug "Calling initial content-length for extra data at end of headers")
1134 (url-http-content-length-after-change-function
1135 (marker-position url-http-end-of-headers
)
1137 (- nd url-http-end-of-headers
)))
1141 (url-http-debug "No content-length, being dumb.")
1142 (setq url-http-after-change-function
1143 'url-http-simple-after-change-function
)))))
1144 ;; We are still at the beginning of the buffer... must just be
1145 ;; waiting for a response.
1146 (url-http-debug "Spinning waiting for headers...")
1147 (when (eq process-buffer
(current-buffer))
1148 (goto-char (point-max)))))
1150 (defun url-http (url callback cbargs
&optional retry-buffer
)
1151 "Retrieve URL via HTTP asynchronously.
1152 URL must be a parsed URL. See `url-generic-parse-url' for details.
1154 When retrieval is completed, execute the function CALLBACK, using
1155 the arguments listed in CBARGS. The first element in CBARGS
1156 should be a plist describing what has happened so far during the
1157 request, as described in the docstring of `url-retrieve' (if in
1158 doubt, specify nil).
1160 Optional arg RETRY-BUFFER, if non-nil, specifies the buffer of a
1161 previous `url-http' call, which is being re-attempted."
1162 (cl-check-type url vector
"Need a pre-parsed URL.")
1163 (let* ((host (url-host (or url-using-proxy url
)))
1164 (port (url-port (or url-using-proxy url
)))
1165 (connection (url-http-find-free-connection host port
))
1166 (buffer (or retry-buffer
1167 (generate-new-buffer
1168 (format " *http %s:%d*" host port
)))))
1169 (if (not connection
)
1170 ;; Failed to open the connection for some reason
1172 (kill-buffer buffer
)
1174 (error "Could not create connection to %s:%d" host port
))
1175 (with-current-buffer buffer
1176 (mm-disable-multibyte)
1177 (setq url-current-object url
1178 mode-line-format
"%b [%s]")
1180 (dolist (var '(url-http-end-of-headers
1181 url-http-content-type
1182 url-http-content-length
1183 url-http-transfer-encoding
1184 url-http-after-change-function
1185 url-http-response-version
1186 url-http-response-status
1187 url-http-chunked-length
1188 url-http-chunked-counter
1189 url-http-chunked-start
1190 url-callback-function
1191 url-callback-arguments
1195 url-http-extra-headers
1199 url-http-connection-opened
1201 (set (make-local-variable var
) nil
))
1203 (setq url-http-method
(or url-request-method
"GET")
1204 url-http-extra-headers url-request-extra-headers
1205 url-http-data url-request-data
1206 url-http-process connection
1207 url-http-chunked-length nil
1208 url-http-chunked-start nil
1209 url-http-chunked-counter
0
1210 url-callback-function callback
1211 url-callback-arguments cbargs
1212 url-http-after-change-function
'url-http-wait-for-headers-change-function
1213 url-http-target-url url-current-object
1214 url-http-no-retry retry-buffer
1215 url-http-connection-opened nil
1216 url-http-proxy url-using-proxy
)
1218 (set-process-buffer connection buffer
)
1219 (set-process-filter connection
'url-http-generic-filter
)
1220 (let ((status (process-status connection
)))
1222 ((eq status
'connect
)
1223 ;; Asynchronous connection
1224 (set-process-sentinel connection
'url-http-async-sentinel
))
1225 ((eq status
'failed
)
1226 ;; Asynchronous connection failed
1227 (error "Could not create connection to %s:%d" host port
))
1229 (set-process-sentinel connection
1230 'url-http-end-of-document-sentinel
)
1231 (process-send-string connection
(url-http-create-request)))))))
1234 (defun url-http-async-sentinel (proc why
)
1235 ;; We are performing an asynchronous connection, and a status change
1237 (when (buffer-name (process-buffer proc
))
1238 (with-current-buffer (process-buffer proc
)
1240 (url-http-connection-opened
1241 (setq url-http-no-retry t
)
1242 (url-http-end-of-document-sentinel proc why
))
1243 ((string= (substring why
0 4) "open")
1244 (setq url-http-connection-opened t
)
1245 (condition-case error
1246 (process-send-string proc
(url-http-create-request))
1248 (setq url-http-connection-opened nil
)
1249 (message "HTTP error: %s" error
))))
1251 (setf (car url-callback-arguments
)
1252 (nconc (list :error
(list 'error
'connection-failed why
1253 :host
(url-host (or url-http-proxy url-current-object
))
1254 :service
(url-port (or url-http-proxy url-current-object
))))
1255 (car url-callback-arguments
)))
1256 (url-http-activate-callback))))))
1258 ;; Since Emacs 19/20 does not allow you to change the
1259 ;; `after-change-functions' hook in the midst of running them, we fake
1260 ;; an after change by hooking into the process filter and inserting
1261 ;; the data ourselves. This is slightly less efficient, but there
1262 ;; were tons of weird ways the after-change code was biting us in the
1264 ;; FIXME this can probably be simplified since the above is no longer true.
1265 (defun url-http-generic-filter (proc data
)
1266 ;; Sometimes we get a zero-length data chunk after the process has
1267 ;; been changed to 'free', which means it has no buffer associated
1268 ;; with it. Do nothing if there is no buffer, or 0 length data.
1269 (and (process-buffer proc
)
1270 (/= (length data
) 0)
1271 (with-current-buffer (process-buffer proc
)
1272 (url-http-debug "Calling after change function `%s' for `%S'" url-http-after-change-function proc
)
1273 (funcall url-http-after-change-function
1276 (goto-char (point-max))
1281 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1282 ;;; file-name-handler stuff from here on out
1283 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1284 (defalias 'url-http-symbol-value-in-buffer
1285 (if (fboundp 'symbol-value-in-buffer
)
1286 'symbol-value-in-buffer
1287 (lambda (symbol buffer
&optional unbound-value
)
1288 "Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound."
1289 (with-current-buffer buffer
1290 (if (not (boundp symbol
))
1292 (symbol-value symbol
))))))
1294 (defun url-http-head (url)
1295 (let ((url-request-method "HEAD")
1296 (url-request-data nil
))
1297 (url-retrieve-synchronously url
)))
1299 (defun url-http-file-exists-p (url)
1302 (buffer (url-http-head url
)))
1305 (setq status
(url-http-symbol-value-in-buffer 'url-http-response-status
1307 exists
(and (integerp status
)
1308 (>= status
200) (< status
300)))
1309 (kill-buffer buffer
))
1312 (defalias 'url-http-file-readable-p
'url-http-file-exists-p
)
1314 (defun url-http-head-file-attributes (url &optional id-format
)
1315 (let ((buffer (url-http-head url
)))
1319 nil
;dir / link / normal file
1320 1 ;number of links to file.
1322 nil nil nil
;atime ; mtime ; ctime
1323 (url-http-symbol-value-in-buffer 'url-http-content-length
1325 (eval-when-compile (make-string 10 ?-
))
1326 nil nil nil
) ;whether gid would change ; inode ; device.
1327 (kill-buffer buffer
)))))
1329 (declare-function url-dav-file-attributes
"url-dav" (url &optional id-format
))
1331 (defun url-http-file-attributes (url &optional id-format
)
1332 (if (url-dav-supported-p url
)
1333 (url-dav-file-attributes url id-format
)
1334 (url-http-head-file-attributes url id-format
)))
1336 (defun url-http-options (url)
1337 "Return a property list describing options available for URL.
1338 This list is retrieved using the `OPTIONS' HTTP method.
1340 Property list members:
1343 A list of symbols specifying what HTTP methods the resource
1347 A list of numbers specifying what DAV protocol/schema versions are
1351 A list of supported DASL search types supported (string form)
1354 A list of the units available for use in partial document fetches.
1357 The `Platform For Privacy Protection' description for the resource.
1358 Currently this is just the raw header contents. This is likely to
1359 change once P3P is formally supported by the URL package or
1361 (let* ((url-request-method "OPTIONS")
1362 (url-request-data nil
)
1363 (buffer (url-retrieve-synchronously url
))
1366 (when (and buffer
(= 2 (/ (url-http-symbol-value-in-buffer
1367 'url-http-response-status buffer
0) 100)))
1368 ;; Only parse the options if we got a 2xx response code!
1369 (with-current-buffer buffer
1372 (mail-narrow-to-head)
1374 ;; Figure out what methods are supported.
1375 (when (setq header
(mail-fetch-field "allow"))
1376 (setq options
(plist-put
1378 (mapcar 'intern
(split-string header
"[ ,]+")))))
1381 (when (setq header
(mail-fetch-field "dav"))
1382 (setq options
(plist-put
1385 (mapcar 'string-to-number
1386 (split-string header
"[, ]+"))))))
1389 (when (setq header
(mail-fetch-field "dasl"))
1390 (setq options
(plist-put
1392 (split-string header
"[, ]+"))))
1394 ;; P3P - should get more detailed here. FIXME
1395 (when (setq header
(mail-fetch-field "p3p"))
1396 (setq options
(plist-put options
'p3p header
)))
1398 ;; Check for whether they accept byte-range requests.
1399 (when (setq header
(mail-fetch-field "accept-ranges"))
1400 (setq options
(plist-put
1404 (split-string header
"[, ]+"))))))
1406 (if buffer
(kill-buffer buffer
))
1409 ;; HTTPS. This used to be in url-https.el, but that file collides
1410 ;; with url-http.el on systems with 8-character file names.
1413 (defconst url-https-default-port
443 "Default HTTPS port.")
1414 (defconst url-https-asynchronous-p t
"HTTPS retrievals are asynchronous.")
1416 ;; FIXME what is the point of this alias being an autoload?
1417 ;; Trying to use it will not cause url-http to be loaded,
1418 ;; since the full alias just gets dumped into loaddefs.el.
1420 ;;;###autoload (autoload 'url-default-expander "url-expand")
1422 (defalias 'url-https-expand-file-name
'url-default-expander
)
1424 (defmacro url-https-create-secure-wrapper
(method args
)
1425 `(defun ,(intern (format (if method
"url-https-%s" "url-https") method
)) ,args
1426 ,(format "HTTPS wrapper around `%s' call." (or method
"url-http"))
1427 (let ((url-gateway-method 'tls
))
1428 (,(intern (format (if method
"url-http-%s" "url-http") method
))
1429 ,@(remove '&rest
(remove '&optional args
))))))
1431 ;;;###autoload (autoload 'url-https "url-http")
1432 (url-https-create-secure-wrapper nil
(url callback cbargs
))
1433 ;;;###autoload (autoload 'url-https-file-exists-p "url-http")
1434 (url-https-create-secure-wrapper file-exists-p
(url))
1435 ;;;###autoload (autoload 'url-https-file-readable-p "url-http")
1436 (url-https-create-secure-wrapper file-readable-p
(url))
1437 ;;;###autoload (autoload 'url-https-file-attributes "url-http")
1438 (url-https-create-secure-wrapper file-attributes
(url &optional id-format
))
1442 ;;; url-http.el ends here