mcs/class/System/System.Net/HttpWebRequest.cs

   1 //
   2 // System.Net.HttpWebRequest
   3 //
   4 // Authors:
   5 //      Lawrence Pit (loz@cable.a2000.nl)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (c) 2002 Lawrence Pit
   9 // (c) 2003 Ximian, Inc. (http://www.ximian.com)
  10 // (c) 2004 Novell, Inc. (http://www.novell.com)
  11 //
  12
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System;
  35 using System.Collections;
  36 using System.Configuration;
  37 using System.IO;
  38 using System.Net.Sockets;
  39 using System.Runtime.Remoting.Messaging;
  40 using System.Runtime.Serialization;
  41 using System.Security.Cryptography.X509Certificates;
  42 using System.Text;
  43 using System.Threading;
  44
  45 namespace System.Net
  46 {
  47         [Serializable]
  48         public class HttpWebRequest : WebRequest, ISerializable
  49         {
  50                 Uri requestUri;
  51                 Uri actualUri;
  52                 bool hostChanged;
  53                 bool allowAutoRedirect = true;
  54                 bool allowBuffering = true;
  55                 X509CertificateCollection certificates;
  56                 string connectionGroup;
  57                 long contentLength = -1;
  58                 HttpContinueDelegate continueDelegate;
  59                 CookieContainer cookieContainer;
  60                 ICredentials credentials;
  61                 bool haveResponse;
  62                 bool haveRequest;
  63                 bool requestSent;
  64                 WebHeaderCollection webHeaders = new WebHeaderCollection (true);
  65                 bool keepAlive = true;
  66                 int maxAutoRedirect = 50;
  67                 string mediaType = String.Empty;
  68                 string method = "GET";
  69                 string initialMethod = "GET";
  70                 bool pipelined = true;
  71                 bool preAuthenticate;
  72                 bool usedPreAuth;
  73                 Version version = HttpVersion.Version11;
  74                 Version actualVersion;
  75                 IWebProxy proxy;
  76                 bool sendChunked;
  77                 ServicePoint servicePoint;
  78                 int timeout = 100000;
  79
  80                 WebConnectionStream writeStream;
  81                 HttpWebResponse webResponse;
  82                 WebAsyncResult asyncWrite;
  83                 WebAsyncResult asyncRead;
  84                 EventHandler abortHandler;
  85                 bool aborted;
  86                 bool gotRequestStream;
  87                 int redirects;
  88                 bool expectContinue;
  89                 bool authCompleted;
  90                 byte[] bodyBuffer;
  91                 int bodyBufferLength;
  92 #if NET_1_1
  93                 int maxResponseHeadersLength;
  94                 static int defaultMaxResponseHeadersLength;
  95                 int readWriteTimeout;
  96
  97                 // Constructors
  98                 static HttpWebRequest ()
  99                 {
 100                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 101                         defaultMaxResponseHeadersLength = 64 * 1024;
 102                         if (config != null) {
 103                                 int x = config.MaxResponseHeadersLength;
 104                                 if (x != -1)
 105                                         x *= 64;
 106
 107                                 defaultMaxResponseHeadersLength = x;
 108                         }
 109                 }
 110 #endif
 111
 112                 internal HttpWebRequest (Uri uri)
 113                 {
 114                         this.requestUri = uri;
 115                         this.actualUri = uri;
 116                         this.proxy = GlobalProxySelection.Select;
 117                 }
 118
 119                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 120                 {
 121                         SerializationInfo info = serializationInfo;
 122
 123                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 124                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 125                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 126                         allowBuffering = info.GetBoolean ("allowBuffering");
 127                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 128                         connectionGroup = info.GetString ("connectionGroup");
 129                         contentLength = info.GetInt64 ("contentLength");
 130                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 131                         keepAlive = info.GetBoolean ("keepAlive");
 132                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 133                         mediaType = info.GetString ("mediaType");
 134                         method = info.GetString ("method");
 135                         initialMethod = info.GetString ("initialMethod");
 136                         pipelined = info.GetBoolean ("pipelined");
 137                         version = (Version) info.GetValue ("version", typeof (Version));
 138                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 139                         sendChunked = info.GetBoolean ("sendChunked");
 140                         timeout = info.GetInt32 ("timeout");
 141                         redirects = info.GetInt32 ("redirects");
 142                 }
 143
 144                 // Properties
 145
 146                 public string Accept {
 147                         get { return webHeaders ["Accept"]; }
 148                         set {
 149                                 CheckRequestStarted ();
 150                                 webHeaders.RemoveAndAdd ("Accept", value);
 151                         }
 152                 }
 153
 154                 public Uri Address {
 155                         get { return actualUri; }
 156                 }
 157
 158                 public bool AllowAutoRedirect {
 159                         get { return allowAutoRedirect; }
 160                         set { this.allowAutoRedirect = value; }
 161                 }
 162
 163                 public bool AllowWriteStreamBuffering {
 164                         get { return allowBuffering; }
 165                         set { allowBuffering = value; }
 166                 }
 167
 168                 internal bool InternalAllowBuffering {
 169                         get {
 170                                 return (allowBuffering && (method == "PUT" || method == "POST"));
 171                         }
 172                 }
 173
 174                 public X509CertificateCollection ClientCertificates {
 175                         get {
 176                                 if (certificates == null)
 177                                         certificates = new X509CertificateCollection ();
 178
 179                                 return certificates;
 180                         }
 181                 }
 182
 183                 public string Connection {
 184                         get { return webHeaders ["Connection"]; }
 185                         set {
 186                                 CheckRequestStarted ();
 187                                 string val = value;
 188                                 if (val != null)
 189                                         val = val.Trim ().ToLower ();
 190
 191                                 if (val == null || val.Length == 0) {
 192                                         webHeaders.RemoveInternal ("Connection");
 193                                         return;
 194                                 }
 195
 196                                 if (val == "keep-alive" || val == "close")
 197                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 198
 199                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 200                                         value = value + ", Keep-Alive";
 201
 202                                 webHeaders.RemoveAndAdd ("Connection", value);
 203                         }
 204                 }
 205
 206                 public override string ConnectionGroupName {
 207                         get { return connectionGroup; }
 208                         set { connectionGroup = value; }
 209                 }
 210
 211                 public override long ContentLength {
 212                         get { return contentLength; }
 213                         set {
 214                                 CheckRequestStarted ();
 215                                 if (value < 0)
 216                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 217
 218                                 contentLength = value;
 219                         }
 220                 }
 221
 222                 internal long InternalContentLength {
 223                         set { contentLength = value; }
 224                 }
 225
 226                 public override string ContentType {
 227                         get { return webHeaders ["Content-Type"]; }
 228                         set {
 229                                 if (value == null || value.Trim().Length == 0) {
 230                                         webHeaders.RemoveInternal ("Content-Type");
 231                                         return;
 232                                 }
 233                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 234                         }
 235                 }
 236
 237                 public HttpContinueDelegate ContinueDelegate {
 238                         get { return continueDelegate; }
 239                         set { continueDelegate = value; }
 240                 }
 241
 242                 public CookieContainer CookieContainer {
 243                         get { return cookieContainer; }
 244                         set { cookieContainer = value; }
 245                 }
 246
 247                 public override ICredentials Credentials {
 248                         get { return credentials; }
 249                         set { credentials = value; }
 250                 }
 251
 252                 public string Expect {
 253                         get { return webHeaders ["Expect"]; }
 254                         set {
 255                                 CheckRequestStarted ();
 256                                 string val = value;
 257                                 if (val != null)
 258                                         val = val.Trim ().ToLower ();
 259
 260                                 if (val == null || val.Length == 0) {
 261                                         webHeaders.RemoveInternal ("Expect");
 262                                         return;
 263                                 }
 264
 265                                 if (val == "100-continue")
 266                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 267                                                                      "value");
 268                                 webHeaders.RemoveAndAdd ("Expect", value);
 269                         }
 270                 }
 271
 272                 public bool HaveResponse {
 273                         get { return haveResponse; }
 274                 }
 275
 276                 public override WebHeaderCollection Headers {
 277                         get { return webHeaders; }
 278                         set {
 279                                 CheckRequestStarted ();
 280                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 281                                 int count = value.Count;
 282                                 for (int i = 0; i < count; i++)
 283                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 284
 285                                 webHeaders = newHeaders;
 286                         }
 287                 }
 288
 289                 public DateTime IfModifiedSince {
 290                         get {
 291                                 string str = webHeaders ["If-Modified-Since"];
 292                                 if (str == null)
 293                                         return DateTime.Now;
 294                                 try {
 295                                         return MonoHttpDate.Parse (str);
 296                                 } catch (Exception) {
 297                                         return DateTime.Now;
 298                                 }
 299                         }
 300                         set {
 301                                 CheckRequestStarted ();
 302                                 // rfc-1123 pattern
 303                                 webHeaders.SetInternal ("If-Modified-Since",
 304                                         value.ToUniversalTime ().ToString ("r", null));
 305                                 // TODO: check last param when using different locale
 306                         }
 307                 }
 308
 309                 public bool KeepAlive {
 310                         get {
 311                                 return keepAlive;
 312                         }
 313                         set {
 314                                 keepAlive = value;
 315                         }
 316                 }
 317
 318                 public int MaximumAutomaticRedirections {
 319                         get { return maxAutoRedirect; }
 320                         set {
 321                                 if (value <= 0)
 322                                         throw new ArgumentException ("Must be > 0", "value");
 323
 324                                 maxAutoRedirect = value;
 325                         }
 326                 }
 327
 328 #if NET_1_1
 329                 [MonoTODO ("Use this")]
 330                 public int MaximumResponseHeadersLength {
 331                         get { return maxResponseHeadersLength; }
 332                         set { maxResponseHeadersLength = value; }
 333                 }
 334
 335                 [MonoTODO ("Use this")]
 336                 public static int DefaultMaximumResponseHeadersLength {
 337                         get { return defaultMaxResponseHeadersLength; }
 338                         set { defaultMaxResponseHeadersLength = value; }
 339                 }
 340
 341                 [MonoTODO ("Use this")]
 342                 public int ReadWriteTimeout {
 343                         get { return readWriteTimeout; }
 344                         set { readWriteTimeout = value; }
 345                 }
 346 #endif
 347
 348                 public string MediaType {
 349                         get { return mediaType; }
 350                         set {
 351                                 mediaType = value;
 352                         }
 353                 }
 354
 355                 public override string Method {
 356                         get { return this.method; }
 357                         set {
 358                                 if (value == null || value.Trim () == "")
 359                                         throw new ArgumentException ("not a valid method");
 360
 361                                 method = value;
 362                         }
 363                 }
 364
 365                 public bool Pipelined {
 366                         get { return pipelined; }
 367                         set { pipelined = value; }
 368                 }
 369
 370                 public override bool PreAuthenticate {
 371                         get { return preAuthenticate; }
 372                         set { preAuthenticate = value; }
 373                 }
 374
 375                 public Version ProtocolVersion {
 376                         get { return version; }
 377                         set {
 378                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 379                                         throw new ArgumentException ("value");
 380
 381                                 version = value;
 382                         }
 383                 }
 384
 385                 public override IWebProxy Proxy {
 386                         get { return proxy; }
 387                         set {
 388                                 CheckRequestStarted ();
 389                                 if (value == null)
 390                                         throw new ArgumentNullException ("value");
 391
 392                                 proxy = value;
 393                                 servicePoint = null; // we may need a new one
 394                         }
 395                 }
 396
 397                 public string Referer {
 398                         get { return webHeaders ["Referer"]; }
 399                         set {
 400                                 CheckRequestStarted ();
 401                                 if (value == null || value.Trim().Length == 0) {
 402                                         webHeaders.RemoveInternal ("Referer");
 403                                         return;
 404                                 }
 405                                 webHeaders.SetInternal ("Referer", value);
 406                         }
 407                 }
 408
 409                 public override Uri RequestUri {
 410                         get { return requestUri; }
 411                 }
 412
 413                 public bool SendChunked {
 414                         get { return sendChunked; }
 415                         set {
 416                                 CheckRequestStarted ();
 417                                 sendChunked = value;
 418                         }
 419                 }
 420
 421                 public ServicePoint ServicePoint {
 422                         get { return GetServicePoint (); }
 423                 }
 424
 425                 public override int Timeout {
 426                         get { return timeout; }
 427                         set {
 428                                 if (value < -1)
 429                                         throw new ArgumentOutOfRangeException ("value");
 430
 431                                 timeout = value;
 432                         }
 433                 }
 434
 435                 public string TransferEncoding {
 436                         get { return webHeaders ["Transfer-Encoding"]; }
 437                         set {
 438                                 CheckRequestStarted ();
 439                                 string val = value;
 440                                 if (val != null)
 441                                         val = val.Trim ().ToLower ();
 442
 443                                 if (val == null || val.Length == 0) {
 444                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 445                                         return;
 446                                 }
 447
 448                                 if (val == "chunked")
 449                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 450
 451                                 if (!sendChunked)
 452                                         throw new ArgumentException ("SendChunked must be True", "value");
 453
 454                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 455                         }
 456                 }
 457
 458                 public string UserAgent {
 459                         get { return webHeaders ["User-Agent"]; }
 460                         set { webHeaders.SetInternal ("User-Agent", value); }
 461                 }
 462
 463 #if NET_1_1
 464                 [MonoTODO]
 465                 public bool UnsafeAuthenticatedConnectionSharing
 466                 {
 467                         get { throw new NotImplementedException (); }
 468                         set { throw new NotImplementedException (); }
 469                 }
 470 #endif
 471
 472                 internal bool GotRequestStream {
 473                         get { return gotRequestStream; }
 474                 }
 475
 476                 internal bool ExpectContinue {
 477                         get { return expectContinue; }
 478                         set { expectContinue = value; }
 479                 }
 480
 481                 internal Uri AuthUri {
 482                         get { return actualUri; }
 483                 }
 484
 485                 internal bool ProxyQuery {
 486                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 487                 }
 488
 489                 // Methods
 490
 491                 internal ServicePoint GetServicePoint ()
 492                 {
 493                         if (!hostChanged && servicePoint != null)
 494                                 return servicePoint;
 495
 496                         lock (this) {
 497                                 if (hostChanged || servicePoint == null) {
 498                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 499                                         hostChanged = false;
 500                                 }
 501                         }
 502
 503                         return servicePoint;
 504                 }
 505
 506                 public void AddRange (int range)
 507                 {
 508                         AddRange ("bytes", range);
 509                 }
 510
 511                 public void AddRange (int from, int to)
 512                 {
 513                         AddRange ("bytes", from, to);
 514                 }
 515
 516                 public void AddRange (string rangeSpecifier, int range)
 517                 {
 518                         if (rangeSpecifier == null)
 519                                 throw new ArgumentNullException ("rangeSpecifier");
 520                         string value = webHeaders ["Range"];
 521                         if (value == null || value.Length == 0)
 522                                 value = rangeSpecifier + "=";
 523                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 524                                 value += ",";
 525                         else
 526                                 throw new InvalidOperationException ("rangeSpecifier");
 527                         webHeaders.RemoveAndAdd ("Range", value + range + "-");
 528                 }
 529
 530                 public void AddRange (string rangeSpecifier, int from, int to)
 531                 {
 532                         if (rangeSpecifier == null)
 533                                 throw new ArgumentNullException ("rangeSpecifier");
 534                         if (from < 0 || to < 0 || from > to)
 535                                 throw new ArgumentOutOfRangeException ();
 536                         string value = webHeaders ["Range"];
 537                         if (value == null || value.Length == 0)
 538                                 value = rangeSpecifier + "=";
 539                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 540                                 value += ",";
 541                         else
 542                                 throw new InvalidOperationException ("rangeSpecifier");
 543                         webHeaders.RemoveAndAdd ("Range", value + from + "-" + to);
 544                 }
 545
 546                 public override int GetHashCode ()
 547                 {
 548                         return base.GetHashCode ();
 549                 }
 550
 551                 void CommonChecks (bool putpost)
 552                 {
 553                         if (method == null)
 554                                 throw new ProtocolViolationException ("Method is null.");
 555
 556                         if (putpost && ((!keepAlive || (contentLength == -1 && !sendChunked)) && !allowBuffering))
 557                                 throw new ProtocolViolationException ("Content-Length not set");
 558
 559                         string transferEncoding = TransferEncoding;
 560                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 561                                 throw new ProtocolViolationException ("SendChunked should be true.");
 562                 }
 563
 564                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 565                 {
 566                         if (aborted)
 567                                 throw new WebException ("The request was previosly aborted.");
 568
 569                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD");
 570                         if (method == null || !send)
 571                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 572
 573                         CommonChecks (send);
 574
 575                         lock (this)
 576                         {
 577                                 if (asyncWrite != null) {
 578                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 579                                                                 "method while a previous call is still in progress.");
 580                                 }
 581
 582                                 asyncWrite = new WebAsyncResult (this, callback, state);
 583                                 initialMethod = method;
 584                                 if (haveRequest) {
 585                                         if (writeStream != null) {
 586                                                 asyncWrite.SetCompleted (true, writeStream);
 587                                                 asyncWrite.DoCallback ();
 588                                                 return asyncWrite;
 589                                         }
 590                                 }
 591
 592                                 gotRequestStream = true;
 593                                 WebAsyncResult result = asyncWrite;
 594                                 if (!requestSent) {
 595                                         requestSent = true;
 596                                         servicePoint = GetServicePoint ();
 597                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 598                                 }
 599                                 return result;
 600                         }
 601                 }
 602
 603                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 604                 {
 605                         if (asyncResult == null)
 606                                 throw new ArgumentNullException ("asyncResult");
 607
 608                         WebAsyncResult result = asyncResult as WebAsyncResult;
 609                         if (result == null)
 610                                 throw new ArgumentException ("Invalid IAsyncResult");
 611
 612                         asyncWrite = result;
 613                         result.WaitUntilComplete ();
 614
 615                         Exception e = result.Exception;
 616                         if (e != null)
 617                                 throw e;
 618
 619                         return result.WriteStream;
 620                 }
 621
 622                 public override Stream GetRequestStream()
 623                 {
 624                         IAsyncResult asyncResult = BeginGetRequestStream (null, null);
 625                         asyncWrite = (WebAsyncResult) asyncResult;
 626                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 627                                 Abort ();
 628                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 629                         }
 630
 631                         return EndGetRequestStream (asyncResult);
 632                 }
 633
 634                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 635                 {
 636                         bool send = (method == "PUT" || method == "POST");
 637                         if (send) {
 638                                 if ((!KeepAlive || (ContentLength == -1 && !SendChunked)) && !AllowWriteStreamBuffering)
 639                                         throw new ProtocolViolationException ("Content-Length not set");
 640                         }
 641
 642                         CommonChecks (send);
 643                         Monitor.Enter (this);
 644                         if (asyncRead != null && !haveResponse) {
 645                                 Monitor.Exit (this);
 646                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 647                                                         "method while a previous call is still in progress.");
 648                         }
 649
 650                         asyncRead = new WebAsyncResult (this, callback, state);
 651                         initialMethod = method;
 652                         if (haveResponse) {
 653                                 if (webResponse != null) {
 654                                         Monitor.Exit (this);
 655                                         asyncRead.SetCompleted (true, webResponse);
 656                                         asyncRead.DoCallback ();
 657                                         return asyncRead;
 658                                 }
 659                         }
 660
 661                         if (!requestSent) {
 662                                 requestSent = true;
 663                                 servicePoint = GetServicePoint ();
 664                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 665                         }
 666
 667                         Monitor.Exit (this);
 668                         return asyncRead;
 669                 }
 670
 671                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 672                 {
 673                         if (asyncResult == null)
 674                                 throw new ArgumentNullException ("asyncResult");
 675
 676                         WebAsyncResult result = asyncResult as WebAsyncResult;
 677                         if (result == null)
 678                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 679
 680                         redirects = 0;
 681                         bool redirected = false;
 682                         asyncRead = result;
 683                         do {
 684                                 if (redirected) {
 685                                         haveResponse = false;
 686                                         result.Reset ();
 687                                         servicePoint = GetServicePoint ();
 688                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 689                                 }
 690
 691                                 if (!result.WaitUntilComplete (timeout, false)) {
 692                                         Abort ();
 693                                         throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 694                                 }
 695
 696                                 redirected = CheckFinalStatus (result);
 697                         } while (redirected);
 698
 699                         return result.Response;
 700                 }
 701
 702                 public override WebResponse GetResponse()
 703                 {
 704                         if (haveResponse && webResponse != null)
 705                                 return webResponse;
 706
 707                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 708                         return EndGetResponse (result);
 709                 }
 710
 711                 public override void Abort ()
 712                 {
 713                         haveResponse = true;
 714                         aborted = true;
 715                         if (asyncWrite != null) {
 716                                 WebAsyncResult r = asyncWrite;
 717                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 718                                 r.SetCompleted (false, wexc);
 719                                 r.DoCallback ();
 720                                 asyncWrite = null;
 721                         }
 722
 723                         if (asyncRead != null) {
 724                                 WebAsyncResult r = asyncRead;
 725                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 726                                 r.SetCompleted (false, wexc);
 727                                 r.DoCallback ();
 728                                 asyncRead = null;
 729                         }
 730
 731                         if (abortHandler != null) {
 732                                 try {
 733                                         abortHandler (this, EventArgs.Empty);
 734                                 } catch {}
 735                                 abortHandler = null;
 736                         }
 737
 738                         if (writeStream != null) {
 739                                 try {
 740                                         writeStream.Close ();
 741                                         writeStream = null;
 742                                 } catch {}
 743                         }
 744
 745                         if (webResponse != null) {
 746                                 try {
 747                                         webResponse.Close ();
 748                                         webResponse = null;
 749                                 } catch {}
 750                         }
 751                 }
 752
 753                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 754                                                   StreamingContext streamingContext)
 755                 {
 756                         SerializationInfo info = serializationInfo;
 757
 758                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 759                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 760                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 761                         info.AddValue ("allowBuffering", allowBuffering);
 762                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 763                         info.AddValue ("connectionGroup", connectionGroup);
 764                         info.AddValue ("contentLength", contentLength);
 765                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 766                         info.AddValue ("keepAlive", keepAlive);
 767                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 768                         info.AddValue ("mediaType", mediaType);
 769                         info.AddValue ("method", method);
 770                         info.AddValue ("initialMethod", initialMethod);
 771                         info.AddValue ("pipelined", pipelined);
 772                         info.AddValue ("version", version, typeof (Version));
 773                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 774                         info.AddValue ("sendChunked", sendChunked);
 775                         info.AddValue ("timeout", timeout);
 776                         info.AddValue ("redirects", redirects);
 777                 }
 778
 779                 void CheckRequestStarted ()
 780                 {
 781                         if (requestSent)
 782                                 throw new InvalidOperationException ("request started");
 783                 }
 784
 785                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 786                 {
 787                         if (continueDelegate != null)
 788                                 continueDelegate (statusCode, headers);
 789                 }
 790
 791                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 792                 {
 793                         redirects++;
 794                         Exception e = null;
 795                         string uriString = null;
 796
 797                         switch (code) {
 798                         case HttpStatusCode.Ambiguous: // 300
 799                                 e = new WebException ("Ambiguous redirect.");
 800                                 break;
 801                         case HttpStatusCode.MovedPermanently: // 301
 802                         case HttpStatusCode.Redirect: // 302
 803                         case HttpStatusCode.TemporaryRedirect: // 307
 804                                 if (method != "GET" && method != "HEAD") // 10.3
 805                                         return false;
 806
 807                                 uriString = webResponse.Headers ["Location"];
 808                                 break;
 809                         case HttpStatusCode.SeeOther: //303
 810                                 method = "GET";
 811                                 uriString = webResponse.Headers ["Location"];
 812                                 break;
 813                         case HttpStatusCode.NotModified: // 304
 814                                 return false;
 815                         case HttpStatusCode.UseProxy: // 305
 816                                 e = new NotImplementedException ("Proxy support not available.");
 817                                 break;
 818                         case HttpStatusCode.Unused: // 306
 819                         default:
 820                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 821                                 break;
 822                         }
 823
 824                         if (e != null)
 825                                 throw e;
 826
 827                         if (uriString == null)
 828                                 throw new WebException ("No Location header found for " + (int) code,
 829                                                         WebExceptionStatus.ProtocolError);
 830
 831                         Uri prev = actualUri;
 832                         try {
 833                                 actualUri = new Uri (actualUri, uriString);
 834                         } catch (Exception) {
 835                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 836                                                                         uriString, (int) code),
 837                                                                         WebExceptionStatus.ProtocolError);
 838                         }
 839
 840                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 841                                         actualUri.Port != prev.Port);
 842                         return true;
 843                 }
 844
 845                 string GetHeaders ()
 846                 {
 847                         bool continue100 = false;
 848                         if (gotRequestStream && contentLength != -1) {
 849                                 continue100 = true;
 850                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 851                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 852                         } else if (sendChunked) {
 853                                 continue100 = true;
 854                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
 855                                 webHeaders.RemoveInternal ("Content-Length");
 856                         }
 857
 858                         if (actualVersion == HttpVersion.Version11 && continue100 &&
 859                             servicePoint.SendContinue) { // RFC2616 8.2.3
 860                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
 861                                 expectContinue = true;
 862                         } else {
 863                                 webHeaders.RemoveInternal ("Expect");
 864                                 expectContinue = false;
 865                         }
 866
 867                         string connectionHeader = (ProxyQuery) ? "Proxy-Connection" : "Connection";
 868                         webHeaders.RemoveInternal ((!ProxyQuery) ? "Proxy-Connection" : "Connection");
 869                         bool spoint10 = (servicePoint.ProtocolVersion == null ||
 870                                          servicePoint.ProtocolVersion == HttpVersion.Version10);
 871
 872                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
 873                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
 874                         } else if (!keepAlive && version == HttpVersion.Version11) {
 875                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
 876                         }
 877
 878                         webHeaders.SetInternal ("Host", actualUri.Authority);
 879                         if (cookieContainer != null) {
 880                                 string cookieHeader = cookieContainer.GetCookieHeader (requestUri);
 881                                 if (cookieHeader != "")
 882                                         webHeaders.SetInternal ("Cookie", cookieHeader);
 883                         }
 884
 885                         if (!usedPreAuth && preAuthenticate)
 886                                 DoPreAuthenticate ();
 887
 888                         return webHeaders.ToString ();
 889                 }
 890
 891                 void DoPreAuthenticate ()
 892                 {
 893                         webHeaders.RemoveInternal ("Proxy-Authorization");
 894                         webHeaders.RemoveInternal ("Authorization");
 895                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
 896                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
 897                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
 898                         if (auth == null)
 899                                 return;
 900
 901                         string authHeader = (isProxy) ? "Proxy-Authorization" : "Authorization";
 902                         webHeaders [authHeader] = auth.Message;
 903                         usedPreAuth = true;
 904                 }
 905
 906                 internal void SetWriteStreamError (WebExceptionStatus status)
 907                 {
 908                         if (aborted)
 909                                 return;
 910
 911                         WebAsyncResult r = asyncWrite;
 912                         if (r == null)
 913                                 r = asyncRead;
 914
 915                         if (r != null) {
 916                                 r.SetCompleted (false, new WebException ("Error: " + status, status));
 917                                 r.DoCallback ();
 918                         }
 919                 }
 920
 921                 internal void SendRequestHeaders ()
 922                 {
 923                         StringBuilder req = new StringBuilder ();
 924                         string query;
 925                         if (!ProxyQuery) {
 926                                 query = actualUri.PathAndQuery;
 927                         } else if (actualUri.IsDefaultPort) {
 928                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
 929                                                                         actualUri.Host,
 930                                                                         actualUri.PathAndQuery);
 931                         } else {
 932                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
 933                                                                            actualUri.Host,
 934                                                                            actualUri.Port,
 935                                                                            actualUri.PathAndQuery);
 936                         }
 937
 938                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
 939                                 actualVersion = servicePoint.ProtocolVersion;
 940                         } else {
 941                                 actualVersion = version;
 942                         }
 943
 944                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
 945                                                                 actualVersion.Major, actualVersion.Minor);
 946                         req.Append (GetHeaders ());
 947                         string reqstr = req.ToString ();
 948                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
 949                         writeStream.SetHeaders (bytes, 0, bytes.Length);
 950                 }
 951
 952                 internal void SetWriteStream (WebConnectionStream stream)
 953                 {
 954                         if (aborted)
 955                                 return;
 956
 957                         writeStream = stream;
 958                         if (bodyBuffer != null) {
 959                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 960                                 contentLength = bodyBufferLength;
 961                                 writeStream.SendChunked = false;
 962                         }
 963
 964                         SendRequestHeaders ();
 965
 966                         haveRequest = true;
 967
 968                         if (bodyBuffer != null) {
 969                                 // The body has been written and buffered. The request "user"
 970                                 // won't write it again, so we must do it.
 971                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
 972                                 bodyBuffer = null;
 973                                 writeStream.Close ();
 974                         }
 975
 976                         if (asyncWrite != null) {
 977                                 asyncWrite.SetCompleted (false, stream);
 978                                 asyncWrite.DoCallback ();
 979                                 asyncWrite = null;
 980                         }
 981                 }
 982
 983                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
 984                 {
 985                         WebAsyncResult r = asyncRead;
 986                         if (r == null)
 987                                 r = asyncWrite;
 988
 989                         if (r != null) {
 990                                 string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
 991                                 WebException wexc = new WebException (msg, e, status, null);
 992                                 r.SetCompleted (false, wexc);
 993                                 r.DoCallback ();
 994                                 asyncRead = null;
 995                                 asyncWrite = null;
 996                         }
 997                 }
 998
 999                 internal void SetResponseData (WebConnectionData data)
1000                 {
1001                         if (aborted) {
1002                                 if (data.stream != null)
1003                                         data.stream.Close ();
1004                                 return;
1005                         }
1006
1007                         webResponse = new HttpWebResponse (actualUri, method, data, (cookieContainer != null));
1008                         haveResponse = true;
1009
1010                         WebAsyncResult r = asyncRead;
1011                         if (r != null) {
1012                                 r.SetCompleted (false, webResponse);
1013                                 r.DoCallback ();
1014                         }
1015                 }
1016
1017                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1018                 {
1019                         authCompleted = false;
1020                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1021                                 return false;
1022
1023                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1024                         if (isProxy && (proxy == null || proxy.Credentials == null))
1025                                 return false;
1026
1027                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
1028                         if (authHeader == null)
1029                                 return false;
1030
1031                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1032                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1033                         if (auth == null)
1034                                 return false;
1035
1036                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1037                         authCompleted = auth.Complete;
1038                         return true;
1039                 }
1040
1041                 // Returns true if redirected
1042                 bool CheckFinalStatus (WebAsyncResult result)
1043                 {
1044                         if (result.GotException)
1045                                 throw result.Exception;
1046
1047                         Exception throwMe = result.Exception;
1048                         bodyBuffer = null;
1049
1050                         HttpWebResponse resp = result.Response;
1051                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1052                         HttpStatusCode code = 0;
1053                         if (throwMe == null && webResponse != null) {
1054                                 code  = webResponse.StatusCode;
1055                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1056                                                         code == HttpStatusCode.ProxyAuthenticationRequired)) {
1057                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1058                                                 // Keep the written body, so it can be rewritten in the retry
1059                                                 if (InternalAllowBuffering) {
1060                                                         bodyBuffer = writeStream.WriteBuffer;
1061                                                         bodyBufferLength = writeStream.WriteBufferLength;
1062                                                         return true;
1063                                                 } else if (method != "PUT" && method != "POST") {
1064                                                         return true;
1065                                                 }
1066
1067                                                 writeStream.InternalClose ();
1068                                                 writeStream = null;
1069                                                 webResponse = null;
1070                                                 throw new WebException ("This request requires buffering " +
1071                                                                         "of data for authentication or " +
1072                                                                         "redirection to be sucessful.");
1073                                         }
1074                                 }
1075
1076                                 if ((int) code >= 400) {
1077                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1078                                                                     (int) code, webResponse.StatusDescription);
1079                                         throwMe = new WebException (err, null, protoError, webResponse);
1080                                 } else if ((int) code == 304 && allowAutoRedirect) {
1081                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1082                                                                     (int) code, webResponse.StatusDescription);
1083                                         throwMe = new WebException (err, null, protoError, webResponse);
1084                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects > maxAutoRedirect) {
1085                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1086                                                                     protoError, webResponse);
1087                                 }
1088                         }
1089
1090                         if (throwMe == null) {
1091                                 bool b = false;
1092                                 if (allowAutoRedirect && (int) code >= 300)
1093                                         b = Redirect (result, code);
1094
1095                                 return b;
1096                         }
1097
1098                         if (writeStream != null) {
1099                                 writeStream.InternalClose ();
1100                                 writeStream = null;
1101                         }
1102
1103                         if (webResponse != null)
1104                                 webResponse = null;
1105
1106                         throw throwMe;
1107                 }
1108         }
1109 }
1110