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                 bool finished_reading;
 101 #if NET_2_0
 102                 DecompressionMethods auto_decomp;
 103 #endif
 104 #if NET_1_1
 105                 int maxResponseHeadersLength;
 106                 static int defaultMaxResponseHeadersLength;
 107                 int readWriteTimeout = 300000; // ms
 108
 109                 // Constructors
 110                 static HttpWebRequest ()
 111                 {
 112                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 113                         defaultMaxResponseHeadersLength = 64 * 1024;
 114                         if (config != null) {
 115                                 int x = config.MaxResponseHeadersLength;
 116                                 if (x != -1)
 117                                         x *= 64;
 118
 119                                 defaultMaxResponseHeadersLength = x;
 120                         }
 121                 }
 122 #endif
 123
 124 #if NET_2_1
 125                 public
 126 #else
 127                 internal
 128 #endif
 129                 HttpWebRequest (Uri uri)
 130                 {
 131                         this.requestUri = uri;
 132                         this.actualUri = uri;
 133                         this.proxy = GlobalProxySelection.Select;
 134                 }
 135
 136 #if NET_2_0
 137                 [Obsolete ("Serialization is obsoleted for this type", false)]
 138 #endif
 139                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 140                 {
 141                         SerializationInfo info = serializationInfo;
 142
 143                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 144                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 145                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 146                         allowBuffering = info.GetBoolean ("allowBuffering");
 147                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 148                         connectionGroup = info.GetString ("connectionGroup");
 149                         contentLength = info.GetInt64 ("contentLength");
 150                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 151                         keepAlive = info.GetBoolean ("keepAlive");
 152                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 153                         mediaType = info.GetString ("mediaType");
 154                         method = info.GetString ("method");
 155                         initialMethod = info.GetString ("initialMethod");
 156                         pipelined = info.GetBoolean ("pipelined");
 157                         version = (Version) info.GetValue ("version", typeof (Version));
 158                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 159                         sendChunked = info.GetBoolean ("sendChunked");
 160                         timeout = info.GetInt32 ("timeout");
 161                         redirects = info.GetInt32 ("redirects");
 162                 }
 163
 164                 // Properties
 165
 166                 internal bool UsesNtlmAuthentication {
 167                         get { return is_ntlm_auth; }
 168                 }
 169
 170                 public string Accept {
 171                         get { return webHeaders ["Accept"]; }
 172                         set {
 173                                 CheckRequestStarted ();
 174                                 webHeaders.RemoveAndAdd ("Accept", value);
 175                         }
 176                 }
 177
 178                 public Uri Address {
 179                         get { return actualUri; }
 180                 }
 181
 182                 public bool AllowAutoRedirect {
 183                         get { return allowAutoRedirect; }
 184                         set { this.allowAutoRedirect = value; }
 185                 }
 186
 187                 public bool AllowWriteStreamBuffering {
 188                         get { return allowBuffering; }
 189                         set { allowBuffering = value; }
 190                 }
 191
 192 #if NET_2_0
 193                 static Exception GetMustImplement ()
 194                 {
 195                         return new NotImplementedException ();
 196                 }
 197
 198                 public DecompressionMethods AutomaticDecompression
 199                 {
 200                         get {
 201                                 return auto_decomp;
 202                         }
 203                         set {
 204                                 CheckRequestStarted ();
 205                                 auto_decomp = value;
 206                         }
 207                 }
 208 #endif
 209
 210                 internal bool InternalAllowBuffering {
 211                         get {
 212                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 213                                                         method != "MKCOL" && method != "CONNECT" &&
 214                                                         method != "DELETE" && method != "TRACE"));
 215                         }
 216                 }
 217
 218                 public X509CertificateCollection ClientCertificates {
 219                         get {
 220                                 if (certificates == null)
 221                                         certificates = new X509CertificateCollection ();
 222
 223                                 return certificates;
 224                         }
 225 #if NET_2_0
 226                         [MonoTODO]
 227                         set {
 228                                 throw GetMustImplement ();
 229                         }
 230 #endif
 231                 }
 232
 233                 public string Connection {
 234                         get { return webHeaders ["Connection"]; }
 235                         set {
 236                                 CheckRequestStarted ();
 237                                 string val = value;
 238                                 if (val != null)
 239                                         val = val.Trim ().ToLower ();
 240
 241                                 if (val == null || val.Length == 0) {
 242                                         webHeaders.RemoveInternal ("Connection");
 243                                         return;
 244                                 }
 245
 246                                 if (val == "keep-alive" || val == "close")
 247                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 248
 249                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 250                                         value = value + ", Keep-Alive";
 251
 252                                 webHeaders.RemoveAndAdd ("Connection", value);
 253                         }
 254                 }
 255
 256                 public override string ConnectionGroupName {
 257                         get { return connectionGroup; }
 258                         set { connectionGroup = value; }
 259                 }
 260
 261                 public override long ContentLength {
 262                         get { return contentLength; }
 263                         set {
 264                                 CheckRequestStarted ();
 265                                 if (value < 0)
 266                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 267
 268                                 contentLength = value;
 269                         }
 270                 }
 271
 272                 internal long InternalContentLength {
 273                         set { contentLength = value; }
 274                 }
 275
 276                 public override string ContentType {
 277                         get { return webHeaders ["Content-Type"]; }
 278                         set {
 279                                 if (value == null || value.Trim().Length == 0) {
 280                                         webHeaders.RemoveInternal ("Content-Type");
 281                                         return;
 282                                 }
 283                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 284                         }
 285                 }
 286
 287                 public HttpContinueDelegate ContinueDelegate {
 288                         get { return continueDelegate; }
 289                         set { continueDelegate = value; }
 290                 }
 291
 292                 public CookieContainer CookieContainer {
 293                         get { return cookieContainer; }
 294                         set { cookieContainer = value; }
 295                 }
 296
 297                 public override ICredentials Credentials {
 298                         get { return credentials; }
 299                         set { credentials = value; }
 300                 }
 301
 302 #if NET_2_0
 303                 [MonoTODO]
 304                 public static new RequestCachePolicy DefaultCachePolicy
 305                 {
 306                         get {
 307                                 throw GetMustImplement ();
 308                         }
 309                         set {
 310                                 throw GetMustImplement ();
 311                         }
 312                 }
 313
 314                 [MonoTODO]
 315                 public static int DefaultMaximumErrorResponseLength
 316                 {
 317                         get {
 318                                 throw GetMustImplement ();
 319                         }
 320                         set {
 321                                 throw GetMustImplement ();
 322                         }
 323                 }
 324 #endif
 325
 326                 public string Expect {
 327                         get { return webHeaders ["Expect"]; }
 328                         set {
 329                                 CheckRequestStarted ();
 330                                 string val = value;
 331                                 if (val != null)
 332                                         val = val.Trim ().ToLower ();
 333
 334                                 if (val == null || val.Length == 0) {
 335                                         webHeaders.RemoveInternal ("Expect");
 336                                         return;
 337                                 }
 338
 339                                 if (val == "100-continue")
 340                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 341                                                                      "value");
 342                                 webHeaders.RemoveAndAdd ("Expect", value);
 343                         }
 344                 }
 345
 346                 public bool HaveResponse {
 347                         get { return haveResponse; }
 348                 }
 349
 350                 public override WebHeaderCollection Headers {
 351                         get { return webHeaders; }
 352                         set {
 353                                 CheckRequestStarted ();
 354                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 355                                 int count = value.Count;
 356                                 for (int i = 0; i < count; i++)
 357                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 358
 359                                 webHeaders = newHeaders;
 360                         }
 361                 }
 362
 363                 public DateTime IfModifiedSince {
 364                         get {
 365                                 string str = webHeaders ["If-Modified-Since"];
 366                                 if (str == null)
 367                                         return DateTime.Now;
 368                                 try {
 369                                         return MonoHttpDate.Parse (str);
 370                                 } catch (Exception) {
 371                                         return DateTime.Now;
 372                                 }
 373                         }
 374                         set {
 375                                 CheckRequestStarted ();
 376                                 // rfc-1123 pattern
 377                                 webHeaders.SetInternal ("If-Modified-Since",
 378                                         value.ToUniversalTime ().ToString ("r", null));
 379                                 // TODO: check last param when using different locale
 380                         }
 381                 }
 382
 383                 public bool KeepAlive {
 384                         get {
 385                                 return keepAlive;
 386                         }
 387                         set {
 388                                 keepAlive = value;
 389                         }
 390                 }
 391
 392                 public int MaximumAutomaticRedirections {
 393                         get { return maxAutoRedirect; }
 394                         set {
 395                                 if (value <= 0)
 396                                         throw new ArgumentException ("Must be > 0", "value");
 397
 398                                 maxAutoRedirect = value;
 399                         }
 400                 }
 401
 402 #if NET_1_1
 403                 [MonoTODO ("Use this")]
 404                 public int MaximumResponseHeadersLength {
 405                         get { return maxResponseHeadersLength; }
 406                         set { maxResponseHeadersLength = value; }
 407                 }
 408
 409                 [MonoTODO ("Use this")]
 410                 public static int DefaultMaximumResponseHeadersLength {
 411                         get { return defaultMaxResponseHeadersLength; }
 412                         set { defaultMaxResponseHeadersLength = value; }
 413                 }
 414
 415                 public
 416 #else
 417                 internal
 418 #endif
 419                 int ReadWriteTimeout {
 420                         get { return readWriteTimeout; }
 421                         set {
 422                                 if (requestSent)
 423                                         throw new InvalidOperationException ("The request has already been sent.");
 424
 425                                 if (value < -1)
 426                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 427
 428                                 readWriteTimeout = value;
 429                         }
 430                 }
 431
 432                 public string MediaType {
 433                         get { return mediaType; }
 434                         set {
 435                                 mediaType = value;
 436                         }
 437                 }
 438
 439                 public override string Method {
 440                         get { return this.method; }
 441                         set {
 442                                 if (value == null || value.Trim () == "")
 443                                         throw new ArgumentException ("not a valid method");
 444
 445                                 method = value;
 446                         }
 447                 }
 448
 449                 public bool Pipelined {
 450                         get { return pipelined; }
 451                         set { pipelined = value; }
 452                 }
 453
 454                 public override bool PreAuthenticate {
 455                         get { return preAuthenticate; }
 456                         set { preAuthenticate = value; }
 457                 }
 458
 459                 public Version ProtocolVersion {
 460                         get { return version; }
 461                         set {
 462                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 463                                         throw new ArgumentException ("value");
 464
 465                                 version = value;
 466                         }
 467                 }
 468
 469                 public override IWebProxy Proxy {
 470                         get { return proxy; }
 471                         set {
 472                                 CheckRequestStarted ();
 473 #if ONLY_1_1
 474                                 if (value == null)
 475                                         throw new ArgumentNullException ("value");
 476 #endif
 477
 478                                 proxy = value;
 479                                 servicePoint = null; // we may need a new one
 480                         }
 481                 }
 482
 483                 public string Referer {
 484                         get { return webHeaders ["Referer"]; }
 485                         set {
 486                                 CheckRequestStarted ();
 487                                 if (value == null || value.Trim().Length == 0) {
 488                                         webHeaders.RemoveInternal ("Referer");
 489                                         return;
 490                                 }
 491                                 webHeaders.SetInternal ("Referer", value);
 492                         }
 493                 }
 494
 495                 public override Uri RequestUri {
 496                         get { return requestUri; }
 497                 }
 498
 499                 public bool SendChunked {
 500                         get { return sendChunked; }
 501                         set {
 502                                 CheckRequestStarted ();
 503                                 sendChunked = value;
 504                         }
 505                 }
 506
 507                 public ServicePoint ServicePoint {
 508                         get { return GetServicePoint (); }
 509                 }
 510
 511                 public override int Timeout {
 512                         get { return timeout; }
 513                         set {
 514                                 if (value < -1)
 515                                         throw new ArgumentOutOfRangeException ("value");
 516
 517                                 timeout = value;
 518                         }
 519                 }
 520
 521                 public string TransferEncoding {
 522                         get { return webHeaders ["Transfer-Encoding"]; }
 523                         set {
 524                                 CheckRequestStarted ();
 525                                 string val = value;
 526                                 if (val != null)
 527                                         val = val.Trim ().ToLower ();
 528
 529                                 if (val == null || val.Length == 0) {
 530                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 531                                         return;
 532                                 }
 533
 534                                 if (val == "chunked")
 535                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 536
 537                                 if (!sendChunked)
 538                                         throw new ArgumentException ("SendChunked must be True", "value");
 539
 540                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 541                         }
 542                 }
 543
 544 #if NET_2_0
 545                 public override bool UseDefaultCredentials
 546                 {
 547                         get { return CredentialCache.DefaultCredentials == Credentials; }
 548                         set { Credentials = value ? CredentialCache.DefaultCredentials : null; }
 549                 }
 550 #endif
 551
 552                 public string UserAgent {
 553                         get { return webHeaders ["User-Agent"]; }
 554                         set { webHeaders.SetInternal ("User-Agent", value); }
 555                 }
 556
 557 #if NET_1_1
 558                 bool unsafe_auth_blah;
 559                 public bool UnsafeAuthenticatedConnectionSharing
 560                 {
 561                         get { return unsafe_auth_blah; }
 562                         set { unsafe_auth_blah = value; }
 563                 }
 564 #endif
 565
 566                 internal bool GotRequestStream {
 567                         get { return gotRequestStream; }
 568                 }
 569
 570                 internal bool ExpectContinue {
 571                         get { return expectContinue; }
 572                         set { expectContinue = value; }
 573                 }
 574
 575                 internal Uri AuthUri {
 576                         get { return actualUri; }
 577                 }
 578
 579                 internal bool ProxyQuery {
 580                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 581                 }
 582
 583                 // Methods
 584
 585                 internal ServicePoint GetServicePoint ()
 586                 {
 587                         lock (locker) {
 588                                 if (hostChanged || servicePoint == null) {
 589                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 590                                         hostChanged = false;
 591                                 }
 592                         }
 593
 594                         return servicePoint;
 595                 }
 596
 597                 public void AddRange (int range)
 598                 {
 599                         AddRange ("bytes", range);
 600                 }
 601
 602                 public void AddRange (int from, int to)
 603                 {
 604                         AddRange ("bytes", from, to);
 605                 }
 606
 607                 public void AddRange (string rangeSpecifier, int range)
 608                 {
 609                         if (rangeSpecifier == null)
 610                                 throw new ArgumentNullException ("rangeSpecifier");
 611                         string value = webHeaders ["Range"];
 612                         if (value == null || value.Length == 0)
 613                                 value = rangeSpecifier + "=";
 614                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 615                                 value += ",";
 616                         else
 617                                 throw new InvalidOperationException ("rangeSpecifier");
 618                         webHeaders.RemoveAndAdd ("Range", value + range + "-");
 619                 }
 620
 621                 public void AddRange (string rangeSpecifier, int from, int to)
 622                 {
 623                         if (rangeSpecifier == null)
 624                                 throw new ArgumentNullException ("rangeSpecifier");
 625                         if (from < 0 || to < 0 || from > to)
 626                                 throw new ArgumentOutOfRangeException ();
 627                         string value = webHeaders ["Range"];
 628                         if (value == null || value.Length == 0)
 629                                 value = rangeSpecifier + "=";
 630                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 631                                 value += ",";
 632                         else
 633                                 throw new InvalidOperationException ("rangeSpecifier");
 634                         webHeaders.RemoveAndAdd ("Range", value + from + "-" + to);
 635                 }
 636 #if !NET_2_0
 637                 public override int GetHashCode ()
 638                 {
 639                         return base.GetHashCode ();
 640                 }
 641 #endif
 642
 643                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 644                 {
 645                         if (aborted)
 646                                 throw new WebException ("The request was previosly aborted.");
 647
 648                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 649                                         method == "TRACE" || method == "DELETE");
 650                         if (method == null || !send)
 651                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 652
 653                         if (contentLength == -1 && !sendChunked && !allowBuffering && KeepAlive)
 654                                 throw new ProtocolViolationException ("Content-Length not set");
 655
 656                         string transferEncoding = TransferEncoding;
 657                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 658                                 throw new ProtocolViolationException ("SendChunked should be true.");
 659
 660                         lock (locker)
 661                         {
 662                                 if (asyncWrite != null) {
 663                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 664                                                                 "method while a previous call is still in progress.");
 665                                 }
 666
 667                                 asyncWrite = new WebAsyncResult (this, callback, state);
 668                                 initialMethod = method;
 669                                 if (haveRequest) {
 670                                         if (writeStream != null) {
 671                                                 asyncWrite.SetCompleted (true, writeStream);
 672                                                 asyncWrite.DoCallback ();
 673                                                 return asyncWrite;
 674                                         }
 675                                 }
 676
 677                                 gotRequestStream = true;
 678                                 WebAsyncResult result = asyncWrite;
 679                                 if (!requestSent) {
 680                                         requestSent = true;
 681                                         redirects = 0;
 682                                         servicePoint = GetServicePoint ();
 683                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 684                                 }
 685                                 return result;
 686                         }
 687                 }
 688
 689                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 690                 {
 691                         if (asyncResult == null)
 692                                 throw new ArgumentNullException ("asyncResult");
 693
 694                         WebAsyncResult result = asyncResult as WebAsyncResult;
 695                         if (result == null)
 696                                 throw new ArgumentException ("Invalid IAsyncResult");
 697
 698                         asyncWrite = result;
 699                         result.WaitUntilComplete ();
 700
 701                         Exception e = result.Exception;
 702                         if (e != null)
 703                                 throw e;
 704
 705                         return result.WriteStream;
 706                 }
 707
 708                 public override Stream GetRequestStream()
 709                 {
 710                         IAsyncResult asyncResult = asyncWrite;
 711                         if (asyncResult == null) {
 712                                 asyncResult = BeginGetRequestStream (null, null);
 713                                 asyncWrite = (WebAsyncResult) asyncResult;
 714                         }
 715
 716                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 717                                 Abort ();
 718                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 719                         }
 720
 721                         return EndGetRequestStream (asyncResult);
 722                 }
 723
 724                 void CheckIfForceWrite ()
 725                 {
 726                         if (writeStream == null || writeStream.RequestWritten|| contentLength < 0 || !InternalAllowBuffering)
 727                                 return;
 728
 729                         // This will write the POST/PUT if the write stream already has the expected
 730                         // amount of bytes in it (ContentLength) (bug #77753).
 731                         if (writeStream.WriteBufferLength == contentLength)
 732                                 writeStream.WriteRequest ();
 733                 }
 734
 735                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 736                 {
 737                         if (method == null)
 738                                 throw new ProtocolViolationException ("Method is null.");
 739
 740 #if !NET_2_0
 741                         bool send = (method == "PUT" || method == "POST");
 742                         if (send && contentLength < 0 && !sendChunked && !allowBuffering && KeepAlive)
 743                                 throw new ProtocolViolationException ("Buffering is disabled, ContentLength is negative and SendChunked is disabled.");
 744
 745                         if (!send && (contentLength > -1 || sendChunked))
 746                                 throw new ProtocolViolationException ("ContentLength can't be set for non-write operations.");
 747 #endif
 748
 749                         string transferEncoding = TransferEncoding;
 750                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 751                                 throw new ProtocolViolationException ("SendChunked should be true.");
 752
 753                         Monitor.Enter (locker);
 754                         getResponseCalled = true;
 755                         if (asyncRead != null && !haveResponse) {
 756                                 Monitor.Exit (locker);
 757                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 758                                                         "method while a previous call is still in progress.");
 759                         }
 760
 761                         CheckIfForceWrite ();
 762                         asyncRead = new WebAsyncResult (this, callback, state);
 763                         WebAsyncResult aread = asyncRead;
 764                         initialMethod = method;
 765                         if (haveResponse) {
 766                                 Exception saved = saved_exc;
 767                                 if (webResponse != null) {
 768                                         Monitor.Exit (locker);
 769                                         if (saved == null) {
 770                                                 aread.SetCompleted (true, webResponse);
 771                                         } else {
 772                                                 aread.SetCompleted (true, saved);
 773                                         }
 774                                         aread.DoCallback ();
 775                                         return aread;
 776                                 } else if (saved != null) {
 777                                         Monitor.Exit (locker);
 778                                         aread.SetCompleted (true, saved);
 779                                         aread.DoCallback ();
 780                                         return aread;
 781                                 }
 782                         }
 783
 784                         if (!requestSent) {
 785                                 requestSent = true;
 786                                 redirects = 0;
 787                                 servicePoint = GetServicePoint ();
 788                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 789                         }
 790
 791                         Monitor.Exit (locker);
 792                         return aread;
 793                 }
 794
 795                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 796                 {
 797                         if (asyncResult == null)
 798                                 throw new ArgumentNullException ("asyncResult");
 799
 800                         WebAsyncResult result = asyncResult as WebAsyncResult;
 801                         if (result == null)
 802                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 803
 804                         if (!result.WaitUntilComplete (timeout, false)) {
 805                                 Abort ();
 806                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 807                         }
 808
 809                         if (result.GotException)
 810                                 throw result.Exception;
 811
 812                         return result.Response;
 813                 }
 814
 815                 public override WebResponse GetResponse()
 816                 {
 817                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 818                         return EndGetResponse (result);
 819                 }
 820
 821                 internal bool FinishedReading {
 822                         get { return finished_reading; }
 823                         set { finished_reading = value; }
 824                 }
 825
 826                 public override void Abort ()
 827                 {
 828                         if (aborted)
 829                                 return;
 830
 831                         aborted = true;
 832                         if (haveResponse && finished_reading)
 833                                 return;
 834
 835                         haveResponse = true;
 836                         if (asyncWrite != null) {
 837                                 WebAsyncResult r = asyncWrite;
 838                                 if (!r.IsCompleted) {
 839                                         try {
 840                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 841                                                 r.SetCompleted (false, wexc);
 842                                                 r.DoCallback ();
 843                                         } catch {}
 844                                 }
 845                                 asyncWrite = null;
 846                         }
 847
 848                         if (asyncRead != null) {
 849                                 WebAsyncResult r = asyncRead;
 850                                 if (!r.IsCompleted) {
 851                                         try {
 852                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 853                                                 r.SetCompleted (false, wexc);
 854                                                 r.DoCallback ();
 855                                         } catch {}
 856                                 }
 857                                 asyncRead = null;
 858                         }
 859
 860                         if (abortHandler != null) {
 861                                 try {
 862                                         abortHandler (this, EventArgs.Empty);
 863                                 } catch (Exception) {}
 864                                 abortHandler = null;
 865                         }
 866
 867                         if (writeStream != null) {
 868                                 try {
 869                                         writeStream.Close ();
 870                                         writeStream = null;
 871                                 } catch {}
 872                         }
 873
 874                         if (webResponse != null) {
 875                                 try {
 876                                         webResponse.Close ();
 877                                         webResponse = null;
 878                                 } catch {}
 879                         }
 880                 }
 881
 882                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 883                                                   StreamingContext streamingContext)
 884                 {
 885                         GetObjectData (serializationInfo, streamingContext);
 886                 }
 887
 888 #if NET_2_0
 889                 protected override
 890 #endif
 891                 void GetObjectData (SerializationInfo serializationInfo,
 892                                     StreamingContext streamingContext)
 893                 {
 894                         SerializationInfo info = serializationInfo;
 895
 896                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 897                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 898                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 899                         info.AddValue ("allowBuffering", allowBuffering);
 900                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 901                         info.AddValue ("connectionGroup", connectionGroup);
 902                         info.AddValue ("contentLength", contentLength);
 903                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 904                         info.AddValue ("keepAlive", keepAlive);
 905                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 906                         info.AddValue ("mediaType", mediaType);
 907                         info.AddValue ("method", method);
 908                         info.AddValue ("initialMethod", initialMethod);
 909                         info.AddValue ("pipelined", pipelined);
 910                         info.AddValue ("version", version, typeof (Version));
 911                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 912                         info.AddValue ("sendChunked", sendChunked);
 913                         info.AddValue ("timeout", timeout);
 914                         info.AddValue ("redirects", redirects);
 915                 }
 916
 917                 void CheckRequestStarted ()
 918                 {
 919                         if (requestSent)
 920                                 throw new InvalidOperationException ("request started");
 921                 }
 922
 923                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 924                 {
 925                         if (continueDelegate != null)
 926                                 continueDelegate (statusCode, headers);
 927                 }
 928
 929                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 930                 {
 931                         redirects++;
 932                         Exception e = null;
 933                         string uriString = null;
 934
 935                         switch (code) {
 936                         case HttpStatusCode.Ambiguous: // 300
 937                                 e = new WebException ("Ambiguous redirect.");
 938                                 break;
 939                         case HttpStatusCode.MovedPermanently: // 301
 940                         case HttpStatusCode.Redirect: // 302
 941                         case HttpStatusCode.TemporaryRedirect: // 307
 942                                 /* MS follows the redirect for POST too
 943                                 if (method != "GET" && method != "HEAD") // 10.3
 944                                         return false;
 945                                 */
 946
 947                                 contentLength = 0;
 948                                 bodyBufferLength = 0;
 949                                 bodyBuffer = null;
 950                                 method = "GET";
 951                                 uriString = webResponse.Headers ["Location"];
 952                                 break;
 953                         case HttpStatusCode.SeeOther: //303
 954                                 method = "GET";
 955                                 uriString = webResponse.Headers ["Location"];
 956                                 break;
 957                         case HttpStatusCode.NotModified: // 304
 958                                 return false;
 959                         case HttpStatusCode.UseProxy: // 305
 960                                 e = new NotImplementedException ("Proxy support not available.");
 961                                 break;
 962                         case HttpStatusCode.Unused: // 306
 963                         default:
 964                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 965                                 break;
 966                         }
 967
 968                         if (e != null)
 969                                 throw e;
 970
 971                         if (uriString == null)
 972                                 throw new WebException ("No Location header found for " + (int) code,
 973                                                         WebExceptionStatus.ProtocolError);
 974
 975                         Uri prev = actualUri;
 976                         try {
 977                                 actualUri = new Uri (actualUri, uriString);
 978                         } catch (Exception) {
 979                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 980                                                                         uriString, (int) code),
 981                                                                         WebExceptionStatus.ProtocolError);
 982                         }
 983
 984                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 985                                         actualUri.Port != prev.Port);
 986                         return true;
 987                 }
 988
 989                 string GetHeaders ()
 990                 {
 991                         bool continue100 = false;
 992                         if (contentLength != -1) {
 993                                 if (contentLength > 0)
 994                                         continue100 = true;
 995                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 996                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 997                         } else if (sendChunked) {
 998                                 continue100 = true;
 999                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
1000                                 webHeaders.RemoveInternal ("Content-Length");
1001                         }
1002
1003                         if (actualVersion == HttpVersion.Version11 && continue100 &&
1004                             servicePoint.SendContinue) { // RFC2616 8.2.3
1005                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
1006                                 expectContinue = true;
1007                         } else {
1008                                 webHeaders.RemoveInternal ("Expect");
1009                                 expectContinue = false;
1010                         }
1011
1012                         bool proxy_query = ProxyQuery;
1013                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
1014                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
1015                         Version proto_version = servicePoint.ProtocolVersion;
1016                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
1017
1018                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
1019                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
1020                         } else if (!keepAlive && version == HttpVersion.Version11) {
1021                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
1022                         }
1023
1024                         webHeaders.SetInternal ("Host", actualUri.Authority);
1025                         if (cookieContainer != null) {
1026                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
1027                                 if (cookieHeader != "")
1028                                         webHeaders.SetInternal ("Cookie", cookieHeader);
1029                         }
1030
1031 #if NET_2_0
1032                         string accept_encoding = null;
1033                         if ((auto_decomp & DecompressionMethods.GZip) != 0)
1034                                 accept_encoding = "gzip";
1035                         if ((auto_decomp & DecompressionMethods.Deflate) != 0)
1036                                 accept_encoding = accept_encoding != null ? "gzip, deflate" : "deflate";
1037                         if (accept_encoding != null)
1038                                 webHeaders.SetInternal ("Accept-Encoding", accept_encoding);
1039 #endif
1040                         if (!usedPreAuth && preAuthenticate)
1041                                 DoPreAuthenticate ();
1042
1043                         return webHeaders.ToString ();
1044                 }
1045
1046                 void DoPreAuthenticate ()
1047                 {
1048                         webHeaders.RemoveInternal ("Proxy-Authorization");
1049                         webHeaders.RemoveInternal ("Authorization");
1050                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1051                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1052                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1053                         if (auth == null)
1054                                 return;
1055
1056                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1057                         webHeaders [authHeader] = auth.Message;
1058                         usedPreAuth = true;
1059                 }
1060
1061                 internal void SetWriteStreamError (WebExceptionStatus status)
1062                 {
1063                         SetWriteStreamError (status, null);
1064                 }
1065
1066                 internal void SetWriteStreamError (WebExceptionStatus status, Exception exc)
1067                 {
1068                         if (aborted)
1069                                 return;
1070
1071                         WebAsyncResult r = asyncWrite;
1072                         if (r == null)
1073                                 r = asyncRead;
1074
1075                         if (r != null) {
1076                                 string msg;
1077                                 if (exc == null)
1078                                         msg = "Error: " + status;
1079                                 else
1080                                         msg = String.Format ("Error: {0} ({1})", status, exc.Message);
1081                                 r.SetCompleted (false, new WebException (msg, status));
1082                                 r.DoCallback ();
1083                         }
1084                 }
1085
1086                 internal void SendRequestHeaders ()
1087                 {
1088                         StringBuilder req = new StringBuilder ();
1089                         string query;
1090                         if (!ProxyQuery) {
1091                                 query = actualUri.PathAndQuery;
1092                         } else if (actualUri.IsDefaultPort) {
1093                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1094                                                                         actualUri.Host,
1095                                                                         actualUri.PathAndQuery);
1096                         } else {
1097                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
1098                                                                            actualUri.Host,
1099                                                                            actualUri.Port,
1100                                                                            actualUri.PathAndQuery);
1101                         }
1102
1103                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1104                                 actualVersion = servicePoint.ProtocolVersion;
1105                         } else {
1106                                 actualVersion = version;
1107                         }
1108
1109                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1110                                                                 actualVersion.Major, actualVersion.Minor);
1111                         req.Append (GetHeaders ());
1112                         string reqstr = req.ToString ();
1113                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
1114                         try {
1115                                 writeStream.SetHeaders (bytes, 0, bytes.Length);
1116                         } catch (WebException wexc) {
1117                                 SetWriteStreamError (wexc.Status);
1118                         } catch (Exception) {
1119                                 SetWriteStreamError (WebExceptionStatus.SendFailure);
1120                         }
1121                 }
1122
1123                 internal void SetWriteStream (WebConnectionStream stream)
1124                 {
1125                         if (aborted)
1126                                 return;
1127
1128                         writeStream = stream;
1129                         if (bodyBuffer != null) {
1130                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1131                                 contentLength = bodyBufferLength;
1132                                 writeStream.SendChunked = false;
1133                         }
1134
1135                         SendRequestHeaders ();
1136
1137                         haveRequest = true;
1138
1139                         if (bodyBuffer != null) {
1140                                 // The body has been written and buffered. The request "user"
1141                                 // won't write it again, so we must do it.
1142                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1143                                 bodyBuffer = null;
1144                                 writeStream.Close ();
1145                         } else if (method == "PUT" || method == "POST" || method == "OPTIONS") {
1146                                 if (getResponseCalled && !writeStream.RequestWritten)
1147                                         writeStream.WriteRequest ();
1148                         }
1149
1150                         if (asyncWrite != null) {
1151                                 asyncWrite.SetCompleted (false, stream);
1152                                 asyncWrite.DoCallback ();
1153                                 asyncWrite = null;
1154                         }
1155                 }
1156
1157                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1158                 {
1159                         if (aborted)
1160                                 return;
1161                         lock (locker) {
1162                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1163                         WebAsyncResult r = asyncRead;
1164                         if (r == null)
1165                                 r = asyncWrite;
1166
1167                         WebException wexc;
1168                         if (e is WebException) {
1169                                 wexc = (WebException) e;
1170                         } else {
1171                                 wexc = new WebException (msg, e, status, null);
1172                         }
1173                         if (r != null) {
1174                                 if (!r.IsCompleted) {
1175                                         r.SetCompleted (false, wexc);
1176                                         r.DoCallback ();
1177                                 } else if (r == asyncWrite) {
1178                                         saved_exc = wexc;
1179                                 }
1180                                 haveResponse = true;
1181                                 asyncRead = null;
1182                                 asyncWrite = null;
1183                         } else {
1184                                 haveResponse = true;
1185                                 saved_exc = wexc;
1186                         }
1187                         }
1188                 }
1189
1190                 void CheckSendError (WebConnectionData data)
1191                 {
1192                         // Got here, but no one called GetResponse
1193                         int status = data.StatusCode;
1194                         if (status < 400 || status == 401 || status == 407)
1195                                 return;
1196
1197                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1198                                 // The request has not been completely sent and we got here!
1199                                 // We should probably just close and cause an error in any case,
1200                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1201                                 webResponse.ReadAll ();
1202                         }
1203                 }
1204
1205                 void HandleNtlmAuth (WebAsyncResult r)
1206                 {
1207                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1208                         if (wce != null) {
1209                                 WebConnection cnc = wce.Connection;
1210                                 cnc.PriorityRequest = this;
1211                                 bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1212                                 ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1213                                 if (creds != null) {
1214                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1215 #if NET_1_1
1216                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1217 #endif
1218                                 }
1219                         }
1220                         r.Reset ();
1221                         haveResponse = false;
1222                         webResponse.ReadAll ();
1223                         webResponse = null;
1224                 }
1225
1226                 internal void SetResponseData (WebConnectionData data)
1227                 {
1228                         lock (locker) {
1229                         if (aborted) {
1230                                 if (data.stream != null)
1231                                         data.stream.Close ();
1232                                 return;
1233                         }
1234
1235                         WebException wexc = null;
1236                         try {
1237                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1238                         } catch (Exception e) {
1239                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1240                                 if (data.stream != null)
1241                                         data.stream.Close ();
1242                         }
1243
1244                         if (wexc == null && (method == "POST" || method == "PUT")) {
1245                                 lock (locker) {
1246                                         CheckSendError (data);
1247                                         if (saved_exc != null)
1248                                                 wexc = (WebException) saved_exc;
1249                                 }
1250                         }
1251
1252                         WebAsyncResult r = asyncRead;
1253
1254                         bool forced = false;
1255                         if (r == null && webResponse != null) {
1256                                 // This is a forced completion (302, 204)...
1257                                 forced = true;
1258                                 r = new WebAsyncResult (null, null);
1259                                 r.SetCompleted (false, webResponse);
1260                         }
1261
1262                         if (r != null) {
1263                                 if (wexc != null) {
1264                                         r.SetCompleted (false, wexc);
1265                                         r.DoCallback ();
1266                                         return;
1267                                 }
1268
1269                                 bool redirected;
1270                                 try {
1271                                         redirected = CheckFinalStatus (r);
1272                                         if (!redirected) {
1273                                                 if (is_ntlm_auth && authCompleted && webResponse != null
1274                                                         && (int)webResponse.StatusCode < 400) {
1275                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1276                                                         if (wce != null) {
1277                                                                 WebConnection cnc = wce.Connection;
1278                                                                 cnc.NtlmAuthenticated = true;
1279                                                         }
1280                                                 }
1281
1282                                                 // clear internal buffer so that it does not
1283                                                 // hold possible big buffer (bug #397627)
1284                                                 if (writeStream != null)
1285                                                         writeStream.KillBuffer ();
1286
1287                                                 haveResponse = true;
1288                                                 r.SetCompleted (false, webResponse);
1289                                                 r.DoCallback ();
1290                                         } else {
1291                                                 if (webResponse != null) {
1292                                                         if (is_ntlm_auth) {
1293                                                                 HandleNtlmAuth (r);
1294                                                                 return;
1295                                                         }
1296                                                         webResponse.Close ();
1297                                                 }
1298                                                 haveResponse = false;
1299                                                 webResponse = null;
1300                                                 r.Reset ();
1301                                                 servicePoint = GetServicePoint ();
1302                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1303                                         }
1304                                 } catch (WebException wexc2) {
1305                                         if (forced) {
1306                                                 saved_exc = wexc2;
1307                                                 haveResponse = true;
1308                                         }
1309                                         r.SetCompleted (false, wexc2);
1310                                         r.DoCallback ();
1311                                         return;
1312                                 } catch (Exception ex) {
1313                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1314                                         if (forced) {
1315                                                 saved_exc = wexc;
1316                                                 haveResponse = true;
1317                                         }
1318                                         r.SetCompleted (false, wexc);
1319                                         r.DoCallback ();
1320                                         return;
1321                                 }
1322                         }
1323                         }
1324                 }
1325
1326                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1327                 {
1328                         authCompleted = false;
1329                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1330                                 return false;
1331
1332                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1333                         if (isProxy && (proxy == null || proxy.Credentials == null))
1334                                 return false;
1335
1336                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
1337                         if (authHeader == null)
1338                                 return false;
1339
1340                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1341                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1342                         if (auth == null)
1343                                 return false;
1344
1345                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1346                         authCompleted = auth.Complete;
1347                         is_ntlm_auth = (auth.Module.AuthenticationType == "NTLM");
1348                         return true;
1349                 }
1350
1351                 // Returns true if redirected
1352                 bool CheckFinalStatus (WebAsyncResult result)
1353                 {
1354                         if (result.GotException)
1355                                 throw result.Exception;
1356
1357                         Exception throwMe = result.Exception;
1358                         bodyBuffer = null;
1359
1360                         HttpWebResponse resp = result.Response;
1361                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1362                         HttpStatusCode code = 0;
1363                         if (throwMe == null && webResponse != null) {
1364                                 code = webResponse.StatusCode;
1365                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1366                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1367                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1368                                                 // Keep the written body, so it can be rewritten in the retry
1369                                                 if (InternalAllowBuffering) {
1370                                                         bodyBuffer = writeStream.WriteBuffer;
1371                                                         bodyBufferLength = writeStream.WriteBufferLength;
1372                                                         return true;
1373                                                 } else if (method != "PUT" && method != "POST") {
1374                                                         return true;
1375                                                 }
1376
1377                                                 writeStream.InternalClose ();
1378                                                 writeStream = null;
1379                                                 webResponse.Close ();
1380                                                 webResponse = null;
1381
1382                                                 throw new WebException ("This request requires buffering " +
1383                                                                         "of data for authentication or " +
1384                                                                         "redirection to be sucessful.");
1385                                         }
1386                                 }
1387
1388                                 if ((int) code >= 400) {
1389                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1390                                                                     (int) code, webResponse.StatusDescription);
1391                                         throwMe = new WebException (err, null, protoError, webResponse);
1392                                         webResponse.ReadAll ();
1393                                 } else if ((int) code == 304 && allowAutoRedirect) {
1394                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1395                                                                     (int) code, webResponse.StatusDescription);
1396                                         throwMe = new WebException (err, null, protoError, webResponse);
1397                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1398                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1399                                                                     protoError, webResponse);
1400                                         webResponse.ReadAll ();
1401                                 }
1402                         }
1403
1404                         if (throwMe == null) {
1405                                 bool b = false;
1406                                 int c = (int) code;
1407                                 if (allowAutoRedirect && c >= 300) {
1408                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1409                                                 bodyBuffer = writeStream.WriteBuffer;
1410                                                 bodyBufferLength = writeStream.WriteBufferLength;
1411                                         }
1412                                         b = Redirect (result, code);
1413                                 }
1414
1415                                 if (resp != null && c >= 300 && c != 304)
1416                                         resp.ReadAll ();
1417
1418                                 return b;
1419                         }
1420
1421                         if (writeStream != null) {
1422                                 writeStream.InternalClose ();
1423                                 writeStream = null;
1424                         }
1425
1426                         webResponse = null;
1427
1428                         throw throwMe;
1429                 }
1430         }
1431 }
1432