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 #if NET_2_0
  46 using System.Net.Cache;
  47 #endif
  48
  49 namespace System.Net
  50 {
  51         [Serializable]
  52         public class HttpWebRequest : WebRequest, ISerializable
  53         {
  54                 Uri requestUri;
  55                 Uri actualUri;
  56                 bool hostChanged;
  57                 bool allowAutoRedirect = true;
  58                 bool allowBuffering = true;
  59                 X509CertificateCollection certificates;
  60                 string connectionGroup;
  61                 long contentLength = -1;
  62                 HttpContinueDelegate continueDelegate;
  63                 CookieContainer cookieContainer;
  64                 ICredentials credentials;
  65                 bool haveResponse;
  66                 bool haveRequest;
  67                 bool requestSent;
  68                 WebHeaderCollection webHeaders = new WebHeaderCollection (true);
  69                 bool keepAlive = true;
  70                 int maxAutoRedirect = 50;
  71                 string mediaType = String.Empty;
  72                 string method = "GET";
  73                 string initialMethod = "GET";
  74                 bool pipelined = true;
  75                 bool preAuthenticate;
  76                 bool usedPreAuth;
  77                 Version version = HttpVersion.Version11;
  78                 Version actualVersion;
  79                 IWebProxy proxy;
  80                 bool sendChunked;
  81                 ServicePoint servicePoint;
  82                 int timeout = 100000;
  83
  84                 WebConnectionStream writeStream;
  85                 HttpWebResponse webResponse;
  86                 WebAsyncResult asyncWrite;
  87                 WebAsyncResult asyncRead;
  88                 EventHandler abortHandler;
  89                 bool aborted;
  90                 bool gotRequestStream;
  91                 int redirects;
  92                 bool expectContinue;
  93                 bool authCompleted;
  94                 byte[] bodyBuffer;
  95                 int bodyBufferLength;
  96                 bool getResponseCalled;
  97                 Exception saved_exc;
  98                 object locker = new object ();
  99                 bool is_ntlm_auth;
 100 #if NET_1_1
 101                 int maxResponseHeadersLength;
 102                 static int defaultMaxResponseHeadersLength;
 103                 int readWriteTimeout = 300000; // ms
 104
 105                 // Constructors
 106                 static HttpWebRequest ()
 107                 {
 108                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 109                         defaultMaxResponseHeadersLength = 64 * 1024;
 110                         if (config != null) {
 111                                 int x = config.MaxResponseHeadersLength;
 112                                 if (x != -1)
 113                                         x *= 64;
 114
 115                                 defaultMaxResponseHeadersLength = x;
 116                         }
 117                 }
 118 #endif
 119
 120 #if NET_2_1
 121                 public
 122 #else
 123                 internal
 124 #endif
 125                 HttpWebRequest (Uri uri)
 126                 {
 127                         this.requestUri = uri;
 128                         this.actualUri = uri;
 129                         this.proxy = GlobalProxySelection.Select;
 130                 }
 131
 132 #if NET_2_0
 133                 [Obsolete ("Serialization is obsoleted for this type", false)]
 134 #endif
 135                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 136                 {
 137                         SerializationInfo info = serializationInfo;
 138
 139                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 140                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 141                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 142                         allowBuffering = info.GetBoolean ("allowBuffering");
 143                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 144                         connectionGroup = info.GetString ("connectionGroup");
 145                         contentLength = info.GetInt64 ("contentLength");
 146                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 147                         keepAlive = info.GetBoolean ("keepAlive");
 148                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 149                         mediaType = info.GetString ("mediaType");
 150                         method = info.GetString ("method");
 151                         initialMethod = info.GetString ("initialMethod");
 152                         pipelined = info.GetBoolean ("pipelined");
 153                         version = (Version) info.GetValue ("version", typeof (Version));
 154                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 155                         sendChunked = info.GetBoolean ("sendChunked");
 156                         timeout = info.GetInt32 ("timeout");
 157                         redirects = info.GetInt32 ("redirects");
 158                 }
 159
 160                 // Properties
 161
 162                 internal bool UsesNtlmAuthentication {
 163                         get { return is_ntlm_auth; }
 164                 }
 165
 166                 public string Accept {
 167                         get { return webHeaders ["Accept"]; }
 168                         set {
 169                                 CheckRequestStarted ();
 170                                 webHeaders.RemoveAndAdd ("Accept", value);
 171                         }
 172                 }
 173
 174                 public Uri Address {
 175                         get { return actualUri; }
 176                 }
 177
 178                 public bool AllowAutoRedirect {
 179                         get { return allowAutoRedirect; }
 180                         set { this.allowAutoRedirect = value; }
 181                 }
 182
 183                 public bool AllowWriteStreamBuffering {
 184                         get { return allowBuffering; }
 185                         set { allowBuffering = value; }
 186                 }
 187
 188 #if NET_2_0
 189                 static Exception GetMustImplement ()
 190                 {
 191                         return new NotImplementedException ();
 192                 }
 193
 194                 [MonoTODO]
 195                 public DecompressionMethods AutomaticDecompression
 196                 {
 197                         get {
 198                                 throw GetMustImplement ();
 199                         }
 200                         set {
 201                                 throw GetMustImplement ();
 202                         }
 203                 }
 204 #endif
 205
 206                 internal bool InternalAllowBuffering {
 207                         get {
 208                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 209                                                         method != "MKCOL" && method != "CONNECT" &&
 210                                                         method != "DELETE" && method != "TRACE"));
 211                         }
 212                 }
 213
 214                 public X509CertificateCollection ClientCertificates {
 215                         get {
 216                                 if (certificates == null)
 217                                         certificates = new X509CertificateCollection ();
 218
 219                                 return certificates;
 220                         }
 221 #if NET_2_0
 222                         [MonoTODO]
 223                         set {
 224                                 throw GetMustImplement ();
 225                         }
 226 #endif
 227                 }
 228
 229                 public string Connection {
 230                         get { return webHeaders ["Connection"]; }
 231                         set {
 232                                 CheckRequestStarted ();
 233                                 string val = value;
 234                                 if (val != null)
 235                                         val = val.Trim ().ToLower ();
 236
 237                                 if (val == null || val.Length == 0) {
 238                                         webHeaders.RemoveInternal ("Connection");
 239                                         return;
 240                                 }
 241
 242                                 if (val == "keep-alive" || val == "close")
 243                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 244
 245                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 246                                         value = value + ", Keep-Alive";
 247
 248                                 webHeaders.RemoveAndAdd ("Connection", value);
 249                         }
 250                 }
 251
 252                 public override string ConnectionGroupName {
 253                         get { return connectionGroup; }
 254                         set { connectionGroup = value; }
 255                 }
 256
 257                 public override long ContentLength {
 258                         get { return contentLength; }
 259                         set {
 260                                 CheckRequestStarted ();
 261                                 if (value < 0)
 262                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 263
 264                                 contentLength = value;
 265                         }
 266                 }
 267
 268                 internal long InternalContentLength {
 269                         set { contentLength = value; }
 270                 }
 271
 272                 public override string ContentType {
 273                         get { return webHeaders ["Content-Type"]; }
 274                         set {
 275                                 if (value == null || value.Trim().Length == 0) {
 276                                         webHeaders.RemoveInternal ("Content-Type");
 277                                         return;
 278                                 }
 279                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 280                         }
 281                 }
 282
 283                 public HttpContinueDelegate ContinueDelegate {
 284                         get { return continueDelegate; }
 285                         set { continueDelegate = value; }
 286                 }
 287
 288                 public CookieContainer CookieContainer {
 289                         get { return cookieContainer; }
 290                         set { cookieContainer = value; }
 291                 }
 292
 293                 public override ICredentials Credentials {
 294                         get { return credentials; }
 295                         set { credentials = value; }
 296                 }
 297
 298 #if NET_2_0
 299                 [MonoTODO]
 300                 public static new RequestCachePolicy DefaultCachePolicy
 301                 {
 302                         get {
 303                                 throw GetMustImplement ();
 304                         }
 305                         set {
 306                                 throw GetMustImplement ();
 307                         }
 308                 }
 309
 310                 [MonoTODO]
 311                 public static int DefaultMaximumErrorResponseLength
 312                 {
 313                         get {
 314                                 throw GetMustImplement ();
 315                         }
 316                         set {
 317                                 throw GetMustImplement ();
 318                         }
 319                 }
 320 #endif
 321
 322                 public string Expect {
 323                         get { return webHeaders ["Expect"]; }
 324                         set {
 325                                 CheckRequestStarted ();
 326                                 string val = value;
 327                                 if (val != null)
 328                                         val = val.Trim ().ToLower ();
 329
 330                                 if (val == null || val.Length == 0) {
 331                                         webHeaders.RemoveInternal ("Expect");
 332                                         return;
 333                                 }
 334
 335                                 if (val == "100-continue")
 336                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 337                                                                      "value");
 338                                 webHeaders.RemoveAndAdd ("Expect", value);
 339                         }
 340                 }
 341
 342                 public bool HaveResponse {
 343                         get { return haveResponse; }
 344                 }
 345
 346                 public override WebHeaderCollection Headers {
 347                         get { return webHeaders; }
 348                         set {
 349                                 CheckRequestStarted ();
 350                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 351                                 int count = value.Count;
 352                                 for (int i = 0; i < count; i++)
 353                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 354
 355                                 webHeaders = newHeaders;
 356                         }
 357                 }
 358
 359                 public DateTime IfModifiedSince {
 360                         get {
 361                                 string str = webHeaders ["If-Modified-Since"];
 362                                 if (str == null)
 363                                         return DateTime.Now;
 364                                 try {
 365                                         return MonoHttpDate.Parse (str);
 366                                 } catch (Exception) {
 367                                         return DateTime.Now;
 368                                 }
 369                         }
 370                         set {
 371                                 CheckRequestStarted ();
 372                                 // rfc-1123 pattern
 373                                 webHeaders.SetInternal ("If-Modified-Since",
 374                                         value.ToUniversalTime ().ToString ("r", null));
 375                                 // TODO: check last param when using different locale
 376                         }
 377                 }
 378
 379                 public bool KeepAlive {
 380                         get {
 381                                 return keepAlive;
 382                         }
 383                         set {
 384                                 keepAlive = value;
 385                         }
 386                 }
 387
 388                 public int MaximumAutomaticRedirections {
 389                         get { return maxAutoRedirect; }
 390                         set {
 391                                 if (value <= 0)
 392                                         throw new ArgumentException ("Must be > 0", "value");
 393
 394                                 maxAutoRedirect = value;
 395                         }
 396                 }
 397
 398 #if NET_1_1
 399                 [MonoTODO ("Use this")]
 400                 public int MaximumResponseHeadersLength {
 401                         get { return maxResponseHeadersLength; }
 402                         set { maxResponseHeadersLength = value; }
 403                 }
 404
 405                 [MonoTODO ("Use this")]
 406                 public static int DefaultMaximumResponseHeadersLength {
 407                         get { return defaultMaxResponseHeadersLength; }
 408                         set { defaultMaxResponseHeadersLength = value; }
 409                 }
 410
 411                 public
 412 #else
 413                 internal
 414 #endif
 415                 int ReadWriteTimeout {
 416                         get { return readWriteTimeout; }
 417                         set {
 418                                 if (requestSent)
 419                                         throw new InvalidOperationException ("The request has already been sent.");
 420
 421                                 if (value < -1)
 422                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 423
 424                                 readWriteTimeout = value;
 425                         }
 426                 }
 427
 428                 public string MediaType {
 429                         get { return mediaType; }
 430                         set {
 431                                 mediaType = value;
 432                         }
 433                 }
 434
 435                 public override string Method {
 436                         get { return this.method; }
 437                         set {
 438                                 if (value == null || value.Trim () == "")
 439                                         throw new ArgumentException ("not a valid method");
 440
 441                                 method = value;
 442                         }
 443                 }
 444
 445                 public bool Pipelined {
 446                         get { return pipelined; }
 447                         set { pipelined = value; }
 448                 }
 449
 450                 public override bool PreAuthenticate {
 451                         get { return preAuthenticate; }
 452                         set { preAuthenticate = value; }
 453                 }
 454
 455                 public Version ProtocolVersion {
 456                         get { return version; }
 457                         set {
 458                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 459                                         throw new ArgumentException ("value");
 460
 461                                 version = value;
 462                         }
 463                 }
 464
 465                 public override IWebProxy Proxy {
 466                         get { return proxy; }
 467                         set {
 468                                 CheckRequestStarted ();
 469 #if ONLY_1_1
 470                                 if (value == null)
 471                                         throw new ArgumentNullException ("value");
 472 #endif
 473
 474                                 proxy = value;
 475                                 servicePoint = null; // we may need a new one
 476                         }
 477                 }
 478
 479                 public string Referer {
 480                         get { return webHeaders ["Referer"]; }
 481                         set {
 482                                 CheckRequestStarted ();
 483                                 if (value == null || value.Trim().Length == 0) {
 484                                         webHeaders.RemoveInternal ("Referer");
 485                                         return;
 486                                 }
 487                                 webHeaders.SetInternal ("Referer", value);
 488                         }
 489                 }
 490
 491                 public override Uri RequestUri {
 492                         get { return requestUri; }
 493                 }
 494
 495                 public bool SendChunked {
 496                         get { return sendChunked; }
 497                         set {
 498                                 CheckRequestStarted ();
 499                                 sendChunked = value;
 500                         }
 501                 }
 502
 503                 public ServicePoint ServicePoint {
 504                         get { return GetServicePoint (); }
 505                 }
 506
 507                 public override int Timeout {
 508                         get { return timeout; }
 509                         set {
 510                                 if (value < -1)
 511                                         throw new ArgumentOutOfRangeException ("value");
 512
 513                                 timeout = value;
 514                         }
 515                 }
 516
 517                 public string TransferEncoding {
 518                         get { return webHeaders ["Transfer-Encoding"]; }
 519                         set {
 520                                 CheckRequestStarted ();
 521                                 string val = value;
 522                                 if (val != null)
 523                                         val = val.Trim ().ToLower ();
 524
 525                                 if (val == null || val.Length == 0) {
 526                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 527                                         return;
 528                                 }
 529
 530                                 if (val == "chunked")
 531                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 532
 533                                 if (!sendChunked)
 534                                         throw new ArgumentException ("SendChunked must be True", "value");
 535
 536                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 537                         }
 538                 }
 539
 540 #if NET_2_0
 541                 public override bool UseDefaultCredentials
 542                 {
 543                         get { return CredentialCache.DefaultCredentials == Credentials; }
 544                         set { Credentials = value ? CredentialCache.DefaultCredentials : null; }
 545                 }
 546 #endif
 547
 548                 public string UserAgent {
 549                         get { return webHeaders ["User-Agent"]; }
 550                         set { webHeaders.SetInternal ("User-Agent", value); }
 551                 }
 552
 553 #if NET_1_1
 554                 bool unsafe_auth_blah;
 555                 public bool UnsafeAuthenticatedConnectionSharing
 556                 {
 557                         get { return unsafe_auth_blah; }
 558                         set { unsafe_auth_blah = value; }
 559                 }
 560 #endif
 561
 562                 internal bool GotRequestStream {
 563                         get { return gotRequestStream; }
 564                 }
 565
 566                 internal bool ExpectContinue {
 567                         get { return expectContinue; }
 568                         set { expectContinue = value; }
 569                 }
 570
 571                 internal Uri AuthUri {
 572                         get { return actualUri; }
 573                 }
 574
 575                 internal bool ProxyQuery {
 576                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 577                 }
 578
 579                 // Methods
 580
 581                 internal ServicePoint GetServicePoint ()
 582                 {
 583                         lock (locker) {
 584                                 if (hostChanged || servicePoint == null) {
 585                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 586                                         hostChanged = false;
 587                                 }
 588                         }
 589
 590                         return servicePoint;
 591                 }
 592
 593                 public void AddRange (int range)
 594                 {
 595                         AddRange ("bytes", range);
 596                 }
 597
 598                 public void AddRange (int from, int to)
 599                 {
 600                         AddRange ("bytes", from, to);
 601                 }
 602
 603                 public void AddRange (string rangeSpecifier, int range)
 604                 {
 605                         if (rangeSpecifier == null)
 606                                 throw new ArgumentNullException ("rangeSpecifier");
 607                         string value = webHeaders ["Range"];
 608                         if (value == null || value.Length == 0)
 609                                 value = rangeSpecifier + "=";
 610                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 611                                 value += ",";
 612                         else
 613                                 throw new InvalidOperationException ("rangeSpecifier");
 614                         webHeaders.RemoveAndAdd ("Range", value + range + "-");
 615                 }
 616
 617                 public void AddRange (string rangeSpecifier, int from, int to)
 618                 {
 619                         if (rangeSpecifier == null)
 620                                 throw new ArgumentNullException ("rangeSpecifier");
 621                         if (from < 0 || to < 0 || from > to)
 622                                 throw new ArgumentOutOfRangeException ();
 623                         string value = webHeaders ["Range"];
 624                         if (value == null || value.Length == 0)
 625                                 value = rangeSpecifier + "=";
 626                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 627                                 value += ",";
 628                         else
 629                                 throw new InvalidOperationException ("rangeSpecifier");
 630                         webHeaders.RemoveAndAdd ("Range", value + from + "-" + to);
 631                 }
 632 #if !NET_2_0
 633                 public override int GetHashCode ()
 634                 {
 635                         return base.GetHashCode ();
 636                 }
 637 #endif
 638
 639                 void CommonChecks (bool putpost)
 640                 {
 641                         if (method == null)
 642                                 throw new ProtocolViolationException ("Method is null.");
 643
 644                         if (putpost && contentLength == -1 && !sendChunked && !allowBuffering)
 645                                 throw new ProtocolViolationException ("Content-Length not set");
 646
 647                         string transferEncoding = TransferEncoding;
 648                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 649                                 throw new ProtocolViolationException ("SendChunked should be true.");
 650                 }
 651
 652                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 653                 {
 654                         if (aborted)
 655                                 throw new WebException ("The request was previosly aborted.");
 656
 657                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 658                                         method == "TRACE" || method == "DELETE");
 659                         if (method == null || !send)
 660                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 661
 662                         CommonChecks (send);
 663
 664                         lock (locker)
 665                         {
 666                                 if (asyncWrite != null) {
 667                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 668                                                                 "method while a previous call is still in progress.");
 669                                 }
 670
 671                                 asyncWrite = new WebAsyncResult (this, callback, state);
 672                                 initialMethod = method;
 673                                 if (haveRequest) {
 674                                         if (writeStream != null) {
 675                                                 asyncWrite.SetCompleted (true, writeStream);
 676                                                 asyncWrite.DoCallback ();
 677                                                 return asyncWrite;
 678                                         }
 679                                 }
 680
 681                                 gotRequestStream = true;
 682                                 WebAsyncResult result = asyncWrite;
 683                                 if (!requestSent) {
 684                                         requestSent = true;
 685                                         redirects = 0;
 686                                         servicePoint = GetServicePoint ();
 687                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 688                                 }
 689                                 return result;
 690                         }
 691                 }
 692
 693                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 694                 {
 695                         if (asyncResult == null)
 696                                 throw new ArgumentNullException ("asyncResult");
 697
 698                         WebAsyncResult result = asyncResult as WebAsyncResult;
 699                         if (result == null)
 700                                 throw new ArgumentException ("Invalid IAsyncResult");
 701
 702                         asyncWrite = result;
 703                         result.WaitUntilComplete ();
 704
 705                         Exception e = result.Exception;
 706                         if (e != null)
 707                                 throw e;
 708
 709                         return result.WriteStream;
 710                 }
 711
 712                 public override Stream GetRequestStream()
 713                 {
 714                         IAsyncResult asyncResult = asyncWrite;
 715                         if (asyncResult == null) {
 716                                 asyncResult = BeginGetRequestStream (null, null);
 717                                 asyncWrite = (WebAsyncResult) asyncResult;
 718                         }
 719
 720                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 721                                 Abort ();
 722                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 723                         }
 724
 725                         return EndGetRequestStream (asyncResult);
 726                 }
 727
 728                 void CheckIfForceWrite ()
 729                 {
 730                         if (writeStream == null || writeStream.RequestWritten|| contentLength < 0 || !InternalAllowBuffering)
 731                                 return;
 732
 733                         // This will write the POST/PUT if the write stream already has the expected
 734                         // amount of bytes in it (ContentLength) (bug #77753).
 735                         if (writeStream.WriteBufferLength == contentLength)
 736                                 writeStream.WriteRequest ();
 737                 }
 738
 739                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 740                 {
 741                         bool send = (method == "PUT" || method == "POST");
 742                         if (send) {
 743                                 if ((!KeepAlive || (ContentLength == -1 && !SendChunked)) && !AllowWriteStreamBuffering)
 744                                         throw new ProtocolViolationException ("Content-Length not set");
 745                         }
 746
 747                         CommonChecks (send);
 748                         Monitor.Enter (locker);
 749                         getResponseCalled = true;
 750                         if (asyncRead != null && !haveResponse) {
 751                                 Monitor.Exit (locker);
 752                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 753                                                         "method while a previous call is still in progress.");
 754                         }
 755
 756                         CheckIfForceWrite ();
 757                         asyncRead = new WebAsyncResult (this, callback, state);
 758                         WebAsyncResult aread = asyncRead;
 759                         initialMethod = method;
 760                         if (haveResponse) {
 761                                 if (webResponse != null) {
 762                                         Exception saved = saved_exc;
 763                                         Monitor.Exit (locker);
 764                                         if (saved == null) {
 765                                                 aread.SetCompleted (true, webResponse);
 766                                         } else {
 767                                                 aread.SetCompleted (true, saved);
 768                                         }
 769                                         aread.DoCallback ();
 770                                         return aread;
 771                                 } else if (saved_exc != null) {
 772                                         aread.SetCompleted (true, saved_exc);
 773                                         aread.DoCallback ();
 774                                         return aread;
 775                                 }
 776                         }
 777
 778                         if (!requestSent) {
 779                                 requestSent = true;
 780                                 redirects = 0;
 781                                 servicePoint = GetServicePoint ();
 782                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 783                         }
 784
 785                         Monitor.Exit (locker);
 786                         return aread;
 787                 }
 788
 789                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 790                 {
 791                         if (asyncResult == null)
 792                                 throw new ArgumentNullException ("asyncResult");
 793
 794                         WebAsyncResult result = asyncResult as WebAsyncResult;
 795                         if (result == null)
 796                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 797
 798                         if (!result.WaitUntilComplete (timeout, false)) {
 799                                 Abort ();
 800                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 801                         }
 802
 803                         if (result.GotException)
 804                                 throw result.Exception;
 805
 806                         return result.Response;
 807                 }
 808
 809                 public override WebResponse GetResponse()
 810                 {
 811                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 812                         return EndGetResponse (result);
 813                 }
 814
 815                 public override void Abort ()
 816                 {
 817                         haveResponse = true;
 818                         aborted = true;
 819                         if (asyncWrite != null) {
 820                                 WebAsyncResult r = asyncWrite;
 821                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 822                                 r.SetCompleted (false, wexc);
 823                                 r.DoCallback ();
 824                                 asyncWrite = null;
 825                         }
 826
 827                         if (asyncRead != null) {
 828                                 WebAsyncResult r = asyncRead;
 829                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 830                                 r.SetCompleted (false, wexc);
 831                                 r.DoCallback ();
 832                                 asyncRead = null;
 833                         }
 834
 835                         if (abortHandler != null) {
 836                                 try {
 837                                         abortHandler (this, EventArgs.Empty);
 838                                 } catch (Exception) {}
 839                                 abortHandler = null;
 840                         }
 841
 842                         if (writeStream != null) {
 843                                 try {
 844                                         writeStream.Close ();
 845                                         writeStream = null;
 846                                 } catch {}
 847                         }
 848
 849                         if (webResponse != null) {
 850                                 try {
 851                                         webResponse.Close ();
 852                                         webResponse = null;
 853                                 } catch {}
 854                         }
 855                 }
 856
 857                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 858                                                   StreamingContext streamingContext)
 859                 {
 860                         GetObjectData (serializationInfo, streamingContext);
 861                 }
 862
 863 #if NET_2_0
 864                 protected override
 865 #endif
 866                 void GetObjectData (SerializationInfo serializationInfo,
 867                                     StreamingContext streamingContext)
 868                 {
 869                         SerializationInfo info = serializationInfo;
 870
 871                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 872                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 873                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 874                         info.AddValue ("allowBuffering", allowBuffering);
 875                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 876                         info.AddValue ("connectionGroup", connectionGroup);
 877                         info.AddValue ("contentLength", contentLength);
 878                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 879                         info.AddValue ("keepAlive", keepAlive);
 880                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 881                         info.AddValue ("mediaType", mediaType);
 882                         info.AddValue ("method", method);
 883                         info.AddValue ("initialMethod", initialMethod);
 884                         info.AddValue ("pipelined", pipelined);
 885                         info.AddValue ("version", version, typeof (Version));
 886                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 887                         info.AddValue ("sendChunked", sendChunked);
 888                         info.AddValue ("timeout", timeout);
 889                         info.AddValue ("redirects", redirects);
 890                 }
 891
 892                 void CheckRequestStarted ()
 893                 {
 894                         if (requestSent)
 895                                 throw new InvalidOperationException ("request started");
 896                 }
 897
 898                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 899                 {
 900                         if (continueDelegate != null)
 901                                 continueDelegate (statusCode, headers);
 902                 }
 903
 904                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 905                 {
 906                         redirects++;
 907                         Exception e = null;
 908                         string uriString = null;
 909
 910                         switch (code) {
 911                         case HttpStatusCode.Ambiguous: // 300
 912                                 e = new WebException ("Ambiguous redirect.");
 913                                 break;
 914                         case HttpStatusCode.MovedPermanently: // 301
 915                         case HttpStatusCode.Redirect: // 302
 916                         case HttpStatusCode.TemporaryRedirect: // 307
 917                                 /* MS follows the redirect for POST too
 918                                 if (method != "GET" && method != "HEAD") // 10.3
 919                                         return false;
 920                                 */
 921
 922                                 contentLength = 0;
 923                                 bodyBufferLength = 0;
 924                                 bodyBuffer = null;
 925                                 method = "GET";
 926                                 uriString = webResponse.Headers ["Location"];
 927                                 break;
 928                         case HttpStatusCode.SeeOther: //303
 929                                 method = "GET";
 930                                 uriString = webResponse.Headers ["Location"];
 931                                 break;
 932                         case HttpStatusCode.NotModified: // 304
 933                                 return false;
 934                         case HttpStatusCode.UseProxy: // 305
 935                                 e = new NotImplementedException ("Proxy support not available.");
 936                                 break;
 937                         case HttpStatusCode.Unused: // 306
 938                         default:
 939                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 940                                 break;
 941                         }
 942
 943                         if (e != null)
 944                                 throw e;
 945
 946                         if (uriString == null)
 947                                 throw new WebException ("No Location header found for " + (int) code,
 948                                                         WebExceptionStatus.ProtocolError);
 949
 950                         Uri prev = actualUri;
 951                         try {
 952                                 actualUri = new Uri (actualUri, uriString);
 953                         } catch (Exception) {
 954                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 955                                                                         uriString, (int) code),
 956                                                                         WebExceptionStatus.ProtocolError);
 957                         }
 958
 959                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 960                                         actualUri.Port != prev.Port);
 961                         return true;
 962                 }
 963
 964                 string GetHeaders ()
 965                 {
 966                         bool continue100 = false;
 967                         if (contentLength != -1) {
 968                                 if (contentLength > 0)
 969                                         continue100 = true;
 970                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 971                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 972                         } else if (sendChunked) {
 973                                 continue100 = true;
 974                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
 975                                 webHeaders.RemoveInternal ("Content-Length");
 976                         }
 977
 978                         if (actualVersion == HttpVersion.Version11 && continue100 &&
 979                             servicePoint.SendContinue) { // RFC2616 8.2.3
 980                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
 981                                 expectContinue = true;
 982                         } else {
 983                                 webHeaders.RemoveInternal ("Expect");
 984                                 expectContinue = false;
 985                         }
 986
 987                         bool proxy_query = ProxyQuery;
 988                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
 989                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
 990                         Version proto_version = servicePoint.ProtocolVersion;
 991                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
 992
 993                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
 994                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
 995                         } else if (!keepAlive && version == HttpVersion.Version11) {
 996                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
 997                         }
 998
 999                         webHeaders.SetInternal ("Host", actualUri.Authority);
1000                         if (cookieContainer != null) {
1001                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
1002                                 if (cookieHeader != "")
1003                                         webHeaders.SetInternal ("Cookie", cookieHeader);
1004                         }
1005
1006                         if (!usedPreAuth && preAuthenticate)
1007                                 DoPreAuthenticate ();
1008
1009                         return webHeaders.ToString ();
1010                 }
1011
1012                 void DoPreAuthenticate ()
1013                 {
1014                         webHeaders.RemoveInternal ("Proxy-Authorization");
1015                         webHeaders.RemoveInternal ("Authorization");
1016                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1017                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1018                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1019                         if (auth == null)
1020                                 return;
1021
1022                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1023                         webHeaders [authHeader] = auth.Message;
1024                         usedPreAuth = true;
1025                 }
1026
1027                 internal void SetWriteStreamError (WebExceptionStatus status)
1028                 {
1029                         if (aborted)
1030                                 return;
1031
1032                         WebAsyncResult r = asyncWrite;
1033                         if (r == null)
1034                                 r = asyncRead;
1035
1036                         if (r != null) {
1037                                 r.SetCompleted (false, new WebException ("Error: " + status, status));
1038                                 r.DoCallback ();
1039                         }
1040                 }
1041
1042                 internal void SendRequestHeaders ()
1043                 {
1044                         StringBuilder req = new StringBuilder ();
1045                         string query;
1046                         if (!ProxyQuery) {
1047                                 query = actualUri.PathAndQuery;
1048                         } else if (actualUri.IsDefaultPort) {
1049                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1050                                                                         actualUri.Host,
1051                                                                         actualUri.PathAndQuery);
1052                         } else {
1053                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
1054                                                                            actualUri.Host,
1055                                                                            actualUri.Port,
1056                                                                            actualUri.PathAndQuery);
1057                         }
1058
1059                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1060                                 actualVersion = servicePoint.ProtocolVersion;
1061                         } else {
1062                                 actualVersion = version;
1063                         }
1064
1065                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1066                                                                 actualVersion.Major, actualVersion.Minor);
1067                         req.Append (GetHeaders ());
1068                         string reqstr = req.ToString ();
1069                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
1070                         try {
1071                                 writeStream.SetHeaders (bytes, 0, bytes.Length);
1072                         } catch (WebException wexc) {
1073                                 SetWriteStreamError (wexc.Status);
1074                         } catch (Exception) {
1075                                 SetWriteStreamError (WebExceptionStatus.SendFailure);
1076                         }
1077                 }
1078
1079                 internal void SetWriteStream (WebConnectionStream stream)
1080                 {
1081                         if (aborted)
1082                                 return;
1083
1084                         writeStream = stream;
1085                         if (bodyBuffer != null) {
1086                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1087                                 contentLength = bodyBufferLength;
1088                                 writeStream.SendChunked = false;
1089                         }
1090
1091                         SendRequestHeaders ();
1092
1093                         haveRequest = true;
1094
1095                         if (bodyBuffer != null) {
1096                                 // The body has been written and buffered. The request "user"
1097                                 // won't write it again, so we must do it.
1098                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1099                                 bodyBuffer = null;
1100                                 writeStream.Close ();
1101                         } else if (method == "PUT" || method == "POST" || method == "OPTIONS") {
1102                                 if (getResponseCalled && !writeStream.RequestWritten)
1103                                         writeStream.WriteRequest ();
1104                         }
1105
1106                         if (asyncWrite != null) {
1107                                 asyncWrite.SetCompleted (false, stream);
1108                                 asyncWrite.DoCallback ();
1109                                 asyncWrite = null;
1110                         }
1111                 }
1112
1113                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1114                 {
1115                         if (aborted)
1116                                 return;
1117                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1118                         WebAsyncResult r = asyncRead;
1119                         if (r == null)
1120                                 r = asyncWrite;
1121
1122                         if (r != null) {
1123                                 WebException wexc;
1124                                 if (e is WebException) {
1125                                         wexc = (WebException) e;
1126                                 } else {
1127                                         wexc = new WebException (msg, e, status, null);
1128                                 }
1129                                 r.SetCompleted (false, wexc);
1130                                 r.DoCallback ();
1131                                 asyncRead = null;
1132                                 asyncWrite = null;
1133                         }
1134                 }
1135
1136                 void CheckSendError (WebConnectionData data)
1137                 {
1138                         // Got here, but no one called GetResponse
1139                         int status = data.StatusCode;
1140                         if (status < 400 || status == 401 || status == 407)
1141                                 return;
1142
1143                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1144                                 // The request has not been completely sent and we got here!
1145                                 // We should probably just close and cause an error in any case,
1146                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1147                                 webResponse.ReadAll ();
1148                         }
1149                 }
1150
1151                 void HandleNtlmAuth (WebAsyncResult r)
1152                 {
1153                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1154                         if (wce != null) {
1155                                 WebConnection cnc = wce.Connection;
1156                                 cnc.PriorityRequest = this;
1157                                 bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1158                                 ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1159                                 if (creds != null) {
1160                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1161 #if NET_1_1
1162                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1163 #endif
1164                                 }
1165                         }
1166                         r.Reset ();
1167                         haveResponse = false;
1168                         webResponse.ReadAll ();
1169                         webResponse = null;
1170                 }
1171
1172                 internal void SetResponseData (WebConnectionData data)
1173                 {
1174                         lock (locker) {
1175                         if (aborted) {
1176                                 if (data.stream != null)
1177                                         data.stream.Close ();
1178                                 return;
1179                         }
1180
1181                         WebException wexc = null;
1182                         try {
1183                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1184                         } catch (Exception e) {
1185                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1186                                 if (data.stream != null)
1187                                         data.stream.Close ();
1188                         }
1189
1190                         if (wexc == null && (method == "POST" || method == "PUT")) {
1191                                 lock (locker) {
1192                                         CheckSendError (data);
1193                                         if (saved_exc != null)
1194                                                 wexc = (WebException) saved_exc;
1195                                 }
1196                         }
1197
1198                         WebAsyncResult r = asyncRead;
1199
1200                         bool forced = false;
1201                         if (r == null && webResponse != null) {
1202                                 // This is a forced completion (302, 204)...
1203                                 forced = true;
1204                                 r = new WebAsyncResult (null, null);
1205                                 r.SetCompleted (false, webResponse);
1206                         }
1207
1208                         if (r != null) {
1209                                 if (wexc != null) {
1210                                         r.SetCompleted (false, wexc);
1211                                         r.DoCallback ();
1212                                         return;
1213                                 }
1214
1215                                 bool redirected;
1216                                 try {
1217                                         redirected = CheckFinalStatus (r);
1218                                         if (!redirected) {
1219                                                 if (is_ntlm_auth && authCompleted && webResponse != null
1220                                                         && (int)webResponse.StatusCode < 400) {
1221                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1222                                                         if (wce != null) {
1223                                                                 WebConnection cnc = wce.Connection;
1224                                                                 cnc.NtlmAuthenticated = true;
1225                                                         }
1226                                                 }
1227
1228                                                 // clear internal buffer so that it does not
1229                                                 // hold possible big buffer (bug #397627)
1230                                                 if (writeStream != null)
1231                                                         writeStream.KillBuffer ();
1232
1233                                                 haveResponse = true;
1234                                                 r.SetCompleted (false, webResponse);
1235                                                 r.DoCallback ();
1236                                         } else {
1237                                                 if (webResponse != null) {
1238                                                         if (is_ntlm_auth) {
1239                                                                 HandleNtlmAuth (r);
1240                                                                 return;
1241                                                         }
1242                                                         webResponse.Close ();
1243                                                 }
1244                                                 haveResponse = false;
1245                                                 webResponse = null;
1246                                                 r.Reset ();
1247                                                 servicePoint = GetServicePoint ();
1248                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1249                                         }
1250                                 } catch (WebException wexc2) {
1251                                         if (forced) {
1252                                                 saved_exc = wexc2;
1253                                                 haveResponse = true;
1254                                         }
1255                                         r.SetCompleted (false, wexc2);
1256                                         r.DoCallback ();
1257                                         return;
1258                                 } catch (Exception ex) {
1259                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1260                                         if (forced) {
1261                                                 saved_exc = wexc;
1262                                                 haveResponse = true;
1263                                         }
1264                                         r.SetCompleted (false, wexc);
1265                                         r.DoCallback ();
1266                                         return;
1267                                 }
1268                         }
1269                         }
1270                 }
1271
1272                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1273                 {
1274                         authCompleted = false;
1275                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1276                                 return false;
1277
1278                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1279                         if (isProxy && (proxy == null || proxy.Credentials == null))
1280                                 return false;
1281
1282                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
1283                         if (authHeader == null)
1284                                 return false;
1285
1286                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1287                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1288                         if (auth == null)
1289                                 return false;
1290
1291                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1292                         authCompleted = auth.Complete;
1293                         is_ntlm_auth = (auth.Module.AuthenticationType == "NTLM");
1294                         return true;
1295                 }
1296
1297                 // Returns true if redirected
1298                 bool CheckFinalStatus (WebAsyncResult result)
1299                 {
1300                         if (result.GotException)
1301                                 throw result.Exception;
1302
1303                         Exception throwMe = result.Exception;
1304                         bodyBuffer = null;
1305
1306                         HttpWebResponse resp = result.Response;
1307                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1308                         HttpStatusCode code = 0;
1309                         if (throwMe == null && webResponse != null) {
1310                                 code = webResponse.StatusCode;
1311                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1312                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1313                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1314                                                 // Keep the written body, so it can be rewritten in the retry
1315                                                 if (InternalAllowBuffering) {
1316                                                         bodyBuffer = writeStream.WriteBuffer;
1317                                                         bodyBufferLength = writeStream.WriteBufferLength;
1318                                                         return true;
1319                                                 } else if (method != "PUT" && method != "POST") {
1320                                                         return true;
1321                                                 }
1322
1323                                                 writeStream.InternalClose ();
1324                                                 writeStream = null;
1325                                                 webResponse.Close ();
1326                                                 webResponse = null;
1327
1328                                                 throw new WebException ("This request requires buffering " +
1329                                                                         "of data for authentication or " +
1330                                                                         "redirection to be sucessful.");
1331                                         }
1332                                 }
1333
1334                                 if ((int) code >= 400) {
1335                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1336                                                                     (int) code, webResponse.StatusDescription);
1337                                         throwMe = new WebException (err, null, protoError, webResponse);
1338                                         webResponse.ReadAll ();
1339                                 } else if ((int) code == 304 && allowAutoRedirect) {
1340                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1341                                                                     (int) code, webResponse.StatusDescription);
1342                                         throwMe = new WebException (err, null, protoError, webResponse);
1343                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1344                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1345                                                                     protoError, webResponse);
1346                                         webResponse.ReadAll ();
1347                                 }
1348                         }
1349
1350                         if (throwMe == null) {
1351                                 bool b = false;
1352                                 int c = (int) code;
1353                                 if (allowAutoRedirect && c >= 300) {
1354                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1355                                                 bodyBuffer = writeStream.WriteBuffer;
1356                                                 bodyBufferLength = writeStream.WriteBufferLength;
1357                                         }
1358                                         b = Redirect (result, code);
1359                                 }
1360
1361                                 if (resp != null && c >= 300 && c != 304)
1362                                         resp.ReadAll ();
1363
1364                                 return b;
1365                         }
1366
1367                         if (writeStream != null) {
1368                                 writeStream.InternalClose ();
1369                                 writeStream = null;
1370                         }
1371
1372                         webResponse = null;
1373
1374                         throw throwMe;
1375                 }
1376         }
1377 }
1378