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.Cache;
  39 using System.Net.Sockets;
  40 using System.Runtime.Remoting.Messaging;
  41 using System.Runtime.Serialization;
  42 using System.Security.Cryptography.X509Certificates;
  43 using System.Text;
  44 using System.Threading;
  45
  46 namespace System.Net
  47 {
  48 #if MOONLIGHT
  49         internal class HttpWebRequest : WebRequest, ISerializable {
  50 #else
  51         [Serializable]
  52         public class HttpWebRequest : WebRequest, ISerializable {
  53 #endif
  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                 int 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                 internal WebConnection WebConnection;
 102                 DecompressionMethods auto_decomp;
 103                 int maxResponseHeadersLength;
 104                 static int defaultMaxResponseHeadersLength;
 105                 int readWriteTimeout = 300000; // ms
 106
 107                 // Constructors
 108                 static HttpWebRequest ()
 109                 {
 110                         defaultMaxResponseHeadersLength = 64 * 1024;
 111 #if !NET_2_1
 112                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 113                         if (config != null) {
 114                                 int x = config.MaxResponseHeadersLength;
 115                                 if (x != -1)
 116                                         x *= 64;
 117
 118                                 defaultMaxResponseHeadersLength = x;
 119                         }
 120 #endif
 121                 }
 122
 123 #if NET_2_1
 124                 public
 125 #else
 126                 internal
 127 #endif
 128                 HttpWebRequest (Uri uri)
 129                 {
 130                         this.requestUri = uri;
 131                         this.actualUri = uri;
 132                         this.proxy = GlobalProxySelection.Select;
 133                 }
 134
 135                 [Obsolete ("Serialization is obsoleted for this type", false)]
 136                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 137                 {
 138                         SerializationInfo info = serializationInfo;
 139
 140                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 141                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 142                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 143                         allowBuffering = info.GetBoolean ("allowBuffering");
 144                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 145                         connectionGroup = info.GetString ("connectionGroup");
 146                         contentLength = info.GetInt64 ("contentLength");
 147                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 148                         keepAlive = info.GetBoolean ("keepAlive");
 149                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 150                         mediaType = info.GetString ("mediaType");
 151                         method = info.GetString ("method");
 152                         initialMethod = info.GetString ("initialMethod");
 153                         pipelined = info.GetBoolean ("pipelined");
 154                         version = (Version) info.GetValue ("version", typeof (Version));
 155                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 156                         sendChunked = info.GetBoolean ("sendChunked");
 157                         timeout = info.GetInt32 ("timeout");
 158                         redirects = info.GetInt32 ("redirects");
 159                 }
 160
 161                 // Properties
 162
 163                 internal bool UsesNtlmAuthentication {
 164                         get { return is_ntlm_auth; }
 165                 }
 166
 167                 public string Accept {
 168                         get { return webHeaders ["Accept"]; }
 169                         set {
 170                                 CheckRequestStarted ();
 171                                 webHeaders.RemoveAndAdd ("Accept", value);
 172                         }
 173                 }
 174
 175                 public Uri Address {
 176                         get { return actualUri; }
 177                 }
 178
 179                 public bool AllowAutoRedirect {
 180                         get { return allowAutoRedirect; }
 181                         set { this.allowAutoRedirect = value; }
 182                 }
 183
 184                 public bool AllowWriteStreamBuffering {
 185                         get { return allowBuffering; }
 186                         set { allowBuffering = value; }
 187                 }
 188
 189                 static Exception GetMustImplement ()
 190                 {
 191                         return new NotImplementedException ();
 192                 }
 193
 194                 public DecompressionMethods AutomaticDecompression
 195                 {
 196                         get {
 197                                 return auto_decomp;
 198                         }
 199                         set {
 200                                 CheckRequestStarted ();
 201                                 auto_decomp = value;
 202                         }
 203                 }
 204
 205                 internal bool InternalAllowBuffering {
 206                         get {
 207                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 208                                                         method != "MKCOL" && method != "CONNECT" &&
 209                                                         method != "DELETE" && method != "TRACE"));
 210                         }
 211                 }
 212
 213                 public X509CertificateCollection ClientCertificates {
 214                         get {
 215                                 if (certificates == null)
 216                                         certificates = new X509CertificateCollection ();
 217
 218                                 return certificates;
 219                         }
 220                         [MonoTODO]
 221                         set {
 222                                 throw GetMustImplement ();
 223                         }
 224                 }
 225
 226                 public string Connection {
 227                         get { return webHeaders ["Connection"]; }
 228                         set {
 229                                 CheckRequestStarted ();
 230                                 string val = value;
 231                                 if (val != null)
 232                                         val = val.Trim ().ToLower ();
 233
 234                                 if (val == null || val.Length == 0) {
 235                                         webHeaders.RemoveInternal ("Connection");
 236                                         return;
 237                                 }
 238
 239                                 if (val == "keep-alive" || val == "close")
 240                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 241
 242                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 243                                         value = value + ", Keep-Alive";
 244
 245                                 webHeaders.RemoveAndAdd ("Connection", value);
 246                         }
 247                 }
 248
 249                 public override string ConnectionGroupName {
 250                         get { return connectionGroup; }
 251                         set { connectionGroup = value; }
 252                 }
 253
 254                 public override long ContentLength {
 255                         get { return contentLength; }
 256                         set {
 257                                 CheckRequestStarted ();
 258                                 if (value < 0)
 259                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 260
 261                                 contentLength = value;
 262                         }
 263                 }
 264
 265                 internal long InternalContentLength {
 266                         set { contentLength = value; }
 267                 }
 268
 269                 public override string ContentType {
 270                         get { return webHeaders ["Content-Type"]; }
 271                         set {
 272                                 if (value == null || value.Trim().Length == 0) {
 273                                         webHeaders.RemoveInternal ("Content-Type");
 274                                         return;
 275                                 }
 276                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 277                         }
 278                 }
 279
 280                 public HttpContinueDelegate ContinueDelegate {
 281                         get { return continueDelegate; }
 282                         set { continueDelegate = value; }
 283                 }
 284
 285                 public CookieContainer CookieContainer {
 286                         get { return cookieContainer; }
 287                         set { cookieContainer = value; }
 288                 }
 289
 290                 public override ICredentials Credentials {
 291                         get { return credentials; }
 292                         set { credentials = value; }
 293                 }
 294
 295                 [MonoTODO]
 296                 public static new RequestCachePolicy DefaultCachePolicy
 297                 {
 298                         get {
 299                                 throw GetMustImplement ();
 300                         }
 301                         set {
 302                                 throw GetMustImplement ();
 303                         }
 304                 }
 305
 306                 [MonoTODO]
 307                 public static int DefaultMaximumErrorResponseLength
 308                 {
 309                         get {
 310                                 throw GetMustImplement ();
 311                         }
 312                         set {
 313                                 throw GetMustImplement ();
 314                         }
 315                 }
 316
 317                 public string Expect {
 318                         get { return webHeaders ["Expect"]; }
 319                         set {
 320                                 CheckRequestStarted ();
 321                                 string val = value;
 322                                 if (val != null)
 323                                         val = val.Trim ().ToLower ();
 324
 325                                 if (val == null || val.Length == 0) {
 326                                         webHeaders.RemoveInternal ("Expect");
 327                                         return;
 328                                 }
 329
 330                                 if (val == "100-continue")
 331                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 332                                                                      "value");
 333                                 webHeaders.RemoveAndAdd ("Expect", value);
 334                         }
 335                 }
 336
 337                 public bool HaveResponse {
 338                         get { return haveResponse; }
 339                 }
 340
 341                 public override WebHeaderCollection Headers {
 342                         get { return webHeaders; }
 343                         set {
 344                                 CheckRequestStarted ();
 345                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 346                                 int count = value.Count;
 347                                 for (int i = 0; i < count; i++)
 348                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 349
 350                                 webHeaders = newHeaders;
 351                         }
 352                 }
 353
 354                 public DateTime IfModifiedSince {
 355                         get {
 356                                 string str = webHeaders ["If-Modified-Since"];
 357                                 if (str == null)
 358                                         return DateTime.Now;
 359                                 try {
 360                                         return MonoHttpDate.Parse (str);
 361                                 } catch (Exception) {
 362                                         return DateTime.Now;
 363                                 }
 364                         }
 365                         set {
 366                                 CheckRequestStarted ();
 367                                 // rfc-1123 pattern
 368                                 webHeaders.SetInternal ("If-Modified-Since",
 369                                         value.ToUniversalTime ().ToString ("r", null));
 370                                 // TODO: check last param when using different locale
 371                         }
 372                 }
 373
 374                 public bool KeepAlive {
 375                         get {
 376                                 return keepAlive;
 377                         }
 378                         set {
 379                                 keepAlive = value;
 380                         }
 381                 }
 382
 383                 public int MaximumAutomaticRedirections {
 384                         get { return maxAutoRedirect; }
 385                         set {
 386                                 if (value <= 0)
 387                                         throw new ArgumentException ("Must be > 0", "value");
 388
 389                                 maxAutoRedirect = value;
 390                         }
 391                 }
 392
 393                 [MonoTODO ("Use this")]
 394                 public int MaximumResponseHeadersLength {
 395                         get { return maxResponseHeadersLength; }
 396                         set { maxResponseHeadersLength = value; }
 397                 }
 398
 399                 [MonoTODO ("Use this")]
 400                 public static int DefaultMaximumResponseHeadersLength {
 401                         get { return defaultMaxResponseHeadersLength; }
 402                         set { defaultMaxResponseHeadersLength = value; }
 403                 }
 404
 405                 public  int ReadWriteTimeout {
 406                         get { return readWriteTimeout; }
 407                         set {
 408                                 if (requestSent)
 409                                         throw new InvalidOperationException ("The request has already been sent.");
 410
 411                                 if (value < -1)
 412                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 413
 414                                 readWriteTimeout = value;
 415                         }
 416                 }
 417
 418                 public string MediaType {
 419                         get { return mediaType; }
 420                         set {
 421                                 mediaType = value;
 422                         }
 423                 }
 424
 425                 public override string Method {
 426                         get { return this.method; }
 427                         set {
 428                                 if (value == null || value.Trim () == "")
 429                                         throw new ArgumentException ("not a valid method");
 430
 431                                 method = value;
 432                         }
 433                 }
 434
 435                 public bool Pipelined {
 436                         get { return pipelined; }
 437                         set { pipelined = value; }
 438                 }
 439
 440                 public override bool PreAuthenticate {
 441                         get { return preAuthenticate; }
 442                         set { preAuthenticate = value; }
 443                 }
 444
 445                 public Version ProtocolVersion {
 446                         get { return version; }
 447                         set {
 448                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 449                                         throw new ArgumentException ("value");
 450
 451                                 version = value;
 452                         }
 453                 }
 454
 455                 public override IWebProxy Proxy {
 456                         get { return proxy; }
 457                         set {
 458                                 CheckRequestStarted ();
 459                                 proxy = value;
 460                                 servicePoint = null; // we may need a new one
 461                         }
 462                 }
 463
 464                 public string Referer {
 465                         get { return webHeaders ["Referer"]; }
 466                         set {
 467                                 CheckRequestStarted ();
 468                                 if (value == null || value.Trim().Length == 0) {
 469                                         webHeaders.RemoveInternal ("Referer");
 470                                         return;
 471                                 }
 472                                 webHeaders.SetInternal ("Referer", value);
 473                         }
 474                 }
 475
 476                 public override Uri RequestUri {
 477                         get { return requestUri; }
 478                 }
 479
 480                 public bool SendChunked {
 481                         get { return sendChunked; }
 482                         set {
 483                                 CheckRequestStarted ();
 484                                 sendChunked = value;
 485                         }
 486                 }
 487
 488                 public ServicePoint ServicePoint {
 489                         get { return GetServicePoint (); }
 490                 }
 491
 492                 public override int Timeout {
 493                         get { return timeout; }
 494                         set {
 495                                 if (value < -1)
 496                                         throw new ArgumentOutOfRangeException ("value");
 497
 498                                 timeout = value;
 499                         }
 500                 }
 501
 502                 public string TransferEncoding {
 503                         get { return webHeaders ["Transfer-Encoding"]; }
 504                         set {
 505                                 CheckRequestStarted ();
 506                                 string val = value;
 507                                 if (val != null)
 508                                         val = val.Trim ().ToLower ();
 509
 510                                 if (val == null || val.Length == 0) {
 511                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 512                                         return;
 513                                 }
 514
 515                                 if (val == "chunked")
 516                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 517
 518                                 if (!sendChunked)
 519                                         throw new ArgumentException ("SendChunked must be True", "value");
 520
 521                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 522                         }
 523                 }
 524
 525                 public override bool UseDefaultCredentials
 526                 {
 527                         get { return CredentialCache.DefaultCredentials == Credentials; }
 528                         set { Credentials = value ? CredentialCache.DefaultCredentials : null; }
 529                 }
 530
 531                 public string UserAgent {
 532                         get { return webHeaders ["User-Agent"]; }
 533                         set { webHeaders.SetInternal ("User-Agent", value); }
 534                 }
 535
 536                 bool unsafe_auth_blah;
 537                 public bool UnsafeAuthenticatedConnectionSharing
 538                 {
 539                         get { return unsafe_auth_blah; }
 540                         set { unsafe_auth_blah = value; }
 541                 }
 542
 543                 internal bool GotRequestStream {
 544                         get { return gotRequestStream; }
 545                 }
 546
 547                 internal bool ExpectContinue {
 548                         get { return expectContinue; }
 549                         set { expectContinue = value; }
 550                 }
 551
 552                 internal Uri AuthUri {
 553                         get { return actualUri; }
 554                 }
 555
 556                 internal bool ProxyQuery {
 557                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 558                 }
 559
 560                 // Methods
 561
 562                 internal ServicePoint GetServicePoint ()
 563                 {
 564                         lock (locker) {
 565                                 if (hostChanged || servicePoint == null) {
 566                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 567                                         hostChanged = false;
 568                                 }
 569                         }
 570
 571                         return servicePoint;
 572                 }
 573
 574                 public void AddRange (int range)
 575                 {
 576                         AddRange ("bytes", range);
 577                 }
 578
 579                 public void AddRange (int from, int to)
 580                 {
 581                         AddRange ("bytes", from, to);
 582                 }
 583
 584                 public void AddRange (string rangeSpecifier, int range)
 585                 {
 586                         if (rangeSpecifier == null)
 587                                 throw new ArgumentNullException ("rangeSpecifier");
 588                         string value = webHeaders ["Range"];
 589                         if (value == null || value.Length == 0)
 590                                 value = rangeSpecifier + "=";
 591                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 592                                 value += ",";
 593                         else
 594                                 throw new InvalidOperationException ("rangeSpecifier");
 595                         webHeaders.RemoveAndAdd ("Range", value + range + "-");
 596                 }
 597
 598                 public void AddRange (string rangeSpecifier, int from, int to)
 599                 {
 600                         if (rangeSpecifier == null)
 601                                 throw new ArgumentNullException ("rangeSpecifier");
 602                         if (from < 0 || to < 0 || from > to)
 603                                 throw new ArgumentOutOfRangeException ();
 604                         string value = webHeaders ["Range"];
 605                         if (value == null || value.Length == 0)
 606                                 value = rangeSpecifier + "=";
 607                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 608                                 value += ",";
 609                         else
 610                                 throw new InvalidOperationException ("rangeSpecifier");
 611                         webHeaders.RemoveAndAdd ("Range", value + from + "-" + to);
 612                 }
 613
 614                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 615                 {
 616                         if (Aborted)
 617                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 618
 619                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 620                                         method == "TRACE" || method == "DELETE");
 621                         if (method == null || !send)
 622                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 623
 624                         if (contentLength == -1 && !sendChunked && !allowBuffering && KeepAlive)
 625                                 throw new ProtocolViolationException ("Content-Length not set");
 626
 627                         string transferEncoding = TransferEncoding;
 628                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 629                                 throw new ProtocolViolationException ("SendChunked should be true.");
 630
 631                         lock (locker)
 632                         {
 633                                 if (asyncWrite != null) {
 634                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 635                                                                 "method while a previous call is still in progress.");
 636                                 }
 637
 638                                 asyncWrite = new WebAsyncResult (this, callback, state);
 639                                 initialMethod = method;
 640                                 if (haveRequest) {
 641                                         if (writeStream != null) {
 642                                                 asyncWrite.SetCompleted (true, writeStream);
 643                                                 asyncWrite.DoCallback ();
 644                                                 return asyncWrite;
 645                                         }
 646                                 }
 647
 648                                 gotRequestStream = true;
 649                                 WebAsyncResult result = asyncWrite;
 650                                 if (!requestSent) {
 651                                         requestSent = true;
 652                                         redirects = 0;
 653                                         servicePoint = GetServicePoint ();
 654                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 655                                 }
 656                                 return result;
 657                         }
 658                 }
 659
 660                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 661                 {
 662                         if (asyncResult == null)
 663                                 throw new ArgumentNullException ("asyncResult");
 664
 665                         WebAsyncResult result = asyncResult as WebAsyncResult;
 666                         if (result == null)
 667                                 throw new ArgumentException ("Invalid IAsyncResult");
 668
 669                         asyncWrite = result;
 670                         result.WaitUntilComplete ();
 671
 672                         Exception e = result.Exception;
 673                         if (e != null)
 674                                 throw e;
 675
 676                         return result.WriteStream;
 677                 }
 678
 679                 public override Stream GetRequestStream()
 680                 {
 681                         IAsyncResult asyncResult = asyncWrite;
 682                         if (asyncResult == null) {
 683                                 asyncResult = BeginGetRequestStream (null, null);
 684                                 asyncWrite = (WebAsyncResult) asyncResult;
 685                         }
 686
 687                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 688                                 Abort ();
 689                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 690                         }
 691
 692                         return EndGetRequestStream (asyncResult);
 693                 }
 694
 695                 void CheckIfForceWrite ()
 696                 {
 697                         if (writeStream == null || writeStream.RequestWritten|| contentLength < 0 || !InternalAllowBuffering)
 698                                 return;
 699
 700                         // This will write the POST/PUT if the write stream already has the expected
 701                         // amount of bytes in it (ContentLength) (bug #77753).
 702                         if (writeStream.WriteBufferLength == contentLength)
 703                                 writeStream.WriteRequest ();
 704                 }
 705
 706                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 707                 {
 708                         if (Aborted)
 709                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 710
 711                         if (method == null)
 712                                 throw new ProtocolViolationException ("Method is null.");
 713
 714                         string transferEncoding = TransferEncoding;
 715                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 716                                 throw new ProtocolViolationException ("SendChunked should be true.");
 717
 718                         Monitor.Enter (locker);
 719                         getResponseCalled = true;
 720                         if (asyncRead != null && !haveResponse) {
 721                                 Monitor.Exit (locker);
 722                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 723                                                         "method while a previous call is still in progress.");
 724                         }
 725
 726                         CheckIfForceWrite ();
 727                         asyncRead = new WebAsyncResult (this, callback, state);
 728                         WebAsyncResult aread = asyncRead;
 729                         initialMethod = method;
 730                         if (haveResponse) {
 731                                 Exception saved = saved_exc;
 732                                 if (webResponse != null) {
 733                                         Monitor.Exit (locker);
 734                                         if (saved == null) {
 735                                                 aread.SetCompleted (true, webResponse);
 736                                         } else {
 737                                                 aread.SetCompleted (true, saved);
 738                                         }
 739                                         aread.DoCallback ();
 740                                         return aread;
 741                                 } else if (saved != null) {
 742                                         Monitor.Exit (locker);
 743                                         aread.SetCompleted (true, saved);
 744                                         aread.DoCallback ();
 745                                         return aread;
 746                                 }
 747                         }
 748
 749                         if (!requestSent) {
 750                                 requestSent = true;
 751                                 redirects = 0;
 752                                 servicePoint = GetServicePoint ();
 753                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 754                         }
 755
 756                         Monitor.Exit (locker);
 757                         return aread;
 758                 }
 759
 760                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 761                 {
 762                         if (asyncResult == null)
 763                                 throw new ArgumentNullException ("asyncResult");
 764
 765                         WebAsyncResult result = asyncResult as WebAsyncResult;
 766                         if (result == null)
 767                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 768
 769                         if (!result.WaitUntilComplete (timeout, false)) {
 770                                 Abort ();
 771                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 772                         }
 773
 774                         if (result.GotException)
 775                                 throw result.Exception;
 776
 777                         return result.Response;
 778                 }
 779
 780                 public override WebResponse GetResponse()
 781                 {
 782                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 783                         return EndGetResponse (result);
 784                 }
 785
 786                 internal bool FinishedReading {
 787                         get { return finished_reading; }
 788                         set { finished_reading = value; }
 789                 }
 790
 791                 internal bool Aborted {
 792                         get { return Interlocked.CompareExchange (ref aborted, 0, 0) == 1; }
 793                 }
 794
 795                 public override void Abort ()
 796                 {
 797                         if (Interlocked.CompareExchange (ref aborted, 1, 0) == 1)
 798                                 return;
 799
 800                         if (haveResponse && finished_reading)
 801                                 return;
 802
 803                         haveResponse = true;
 804                         if (abortHandler != null) {
 805                                 try {
 806                                         abortHandler (this, EventArgs.Empty);
 807                                 } catch (Exception) {}
 808                                 abortHandler = null;
 809                         }
 810
 811                         if (asyncWrite != null) {
 812                                 WebAsyncResult r = asyncWrite;
 813                                 if (!r.IsCompleted) {
 814                                         try {
 815                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 816                                                 r.SetCompleted (false, wexc);
 817                                                 r.DoCallback ();
 818                                         } catch {}
 819                                 }
 820                                 asyncWrite = null;
 821                         }
 822
 823                         if (asyncRead != null) {
 824                                 WebAsyncResult r = asyncRead;
 825                                 if (!r.IsCompleted) {
 826                                         try {
 827                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 828                                                 r.SetCompleted (false, wexc);
 829                                                 r.DoCallback ();
 830                                         } catch {}
 831                                 }
 832                                 asyncRead = null;
 833                         }
 834
 835                         if (writeStream != null) {
 836                                 try {
 837                                         writeStream.Close ();
 838                                         writeStream = null;
 839                                 } catch {}
 840                         }
 841
 842                         if (webResponse != null) {
 843                                 try {
 844                                         webResponse.Close ();
 845                                         webResponse = null;
 846                                 } catch {}
 847                         }
 848                 }
 849
 850                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 851                                                   StreamingContext streamingContext)
 852                 {
 853                         GetObjectData (serializationInfo, streamingContext);
 854                 }
 855
 856                 protected override void GetObjectData (SerializationInfo serializationInfo,
 857                         StreamingContext streamingContext)
 858                 {
 859                         SerializationInfo info = serializationInfo;
 860
 861                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 862                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 863                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 864                         info.AddValue ("allowBuffering", allowBuffering);
 865                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 866                         info.AddValue ("connectionGroup", connectionGroup);
 867                         info.AddValue ("contentLength", contentLength);
 868                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 869                         info.AddValue ("keepAlive", keepAlive);
 870                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 871                         info.AddValue ("mediaType", mediaType);
 872                         info.AddValue ("method", method);
 873                         info.AddValue ("initialMethod", initialMethod);
 874                         info.AddValue ("pipelined", pipelined);
 875                         info.AddValue ("version", version, typeof (Version));
 876                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 877                         info.AddValue ("sendChunked", sendChunked);
 878                         info.AddValue ("timeout", timeout);
 879                         info.AddValue ("redirects", redirects);
 880                 }
 881
 882                 void CheckRequestStarted ()
 883                 {
 884                         if (requestSent)
 885                                 throw new InvalidOperationException ("request started");
 886                 }
 887
 888                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 889                 {
 890                         if (continueDelegate != null)
 891                                 continueDelegate (statusCode, headers);
 892                 }
 893
 894                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 895                 {
 896                         redirects++;
 897                         Exception e = null;
 898                         string uriString = null;
 899
 900                         switch (code) {
 901                         case HttpStatusCode.Ambiguous: // 300
 902                                 e = new WebException ("Ambiguous redirect.");
 903                                 break;
 904                         case HttpStatusCode.MovedPermanently: // 301
 905                         case HttpStatusCode.Redirect: // 302
 906                         case HttpStatusCode.TemporaryRedirect: // 307
 907                                 /* MS follows the redirect for POST too
 908                                 if (method != "GET" && method != "HEAD") // 10.3
 909                                         return false;
 910                                 */
 911
 912                                 contentLength = 0;
 913                                 bodyBufferLength = 0;
 914                                 bodyBuffer = null;
 915                                 method = "GET";
 916                                 uriString = webResponse.Headers ["Location"];
 917                                 break;
 918                         case HttpStatusCode.SeeOther: //303
 919                                 method = "GET";
 920                                 uriString = webResponse.Headers ["Location"];
 921                                 break;
 922                         case HttpStatusCode.NotModified: // 304
 923                                 return false;
 924                         case HttpStatusCode.UseProxy: // 305
 925                                 e = new NotImplementedException ("Proxy support not available.");
 926                                 break;
 927                         case HttpStatusCode.Unused: // 306
 928                         default:
 929                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 930                                 break;
 931                         }
 932
 933                         if (e != null)
 934                                 throw e;
 935
 936                         if (uriString == null)
 937                                 throw new WebException ("No Location header found for " + (int) code,
 938                                                         WebExceptionStatus.ProtocolError);
 939
 940                         Uri prev = actualUri;
 941                         try {
 942                                 actualUri = new Uri (actualUri, uriString);
 943                         } catch (Exception) {
 944                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 945                                                                         uriString, (int) code),
 946                                                                         WebExceptionStatus.ProtocolError);
 947                         }
 948
 949                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 950                                         actualUri.Port != prev.Port);
 951                         return true;
 952                 }
 953
 954                 string GetHeaders ()
 955                 {
 956                         bool continue100 = false;
 957                         if (sendChunked) {
 958                                 continue100 = true;
 959                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
 960                                 webHeaders.RemoveInternal ("Content-Length");
 961                         } else if (contentLength != -1) {
 962                                 if (contentLength > 0)
 963                                         continue100 = true;
 964                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 965                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 966                         }
 967
 968                         if (actualVersion == HttpVersion.Version11 && continue100 &&
 969                             servicePoint.SendContinue) { // RFC2616 8.2.3
 970                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
 971                                 expectContinue = true;
 972                         } else {
 973                                 webHeaders.RemoveInternal ("Expect");
 974                                 expectContinue = false;
 975                         }
 976
 977                         bool proxy_query = ProxyQuery;
 978                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
 979                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
 980                         Version proto_version = servicePoint.ProtocolVersion;
 981                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
 982
 983                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
 984                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
 985                         } else if (!keepAlive && version == HttpVersion.Version11) {
 986                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
 987                         }
 988
 989                         webHeaders.SetInternal ("Host", actualUri.Authority);
 990                         if (cookieContainer != null) {
 991                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
 992                                 if (cookieHeader != "")
 993                                         webHeaders.SetInternal ("Cookie", cookieHeader);
 994                         }
 995
 996                         string accept_encoding = null;
 997                         if ((auto_decomp & DecompressionMethods.GZip) != 0)
 998                                 accept_encoding = "gzip";
 999                         if ((auto_decomp & DecompressionMethods.Deflate) != 0)
1000                                 accept_encoding = accept_encoding != null ? "gzip, deflate" : "deflate";
1001                         if (accept_encoding != null)
1002                                 webHeaders.RemoveAndAdd ("Accept-Encoding", accept_encoding);
1003
1004                         if (!usedPreAuth && preAuthenticate)
1005                                 DoPreAuthenticate ();
1006
1007                         return webHeaders.ToString ();
1008                 }
1009
1010                 void DoPreAuthenticate ()
1011                 {
1012                         webHeaders.RemoveInternal ("Proxy-Authorization");
1013                         webHeaders.RemoveInternal ("Authorization");
1014                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1015                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1016                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1017                         if (auth == null)
1018                                 return;
1019
1020                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1021                         webHeaders [authHeader] = auth.Message;
1022                         usedPreAuth = true;
1023                 }
1024
1025                 internal void SetWriteStreamError (WebExceptionStatus status, Exception exc)
1026                 {
1027                         if (Aborted)
1028                                 return;
1029
1030                         WebAsyncResult r = asyncWrite;
1031                         if (r == null)
1032                                 r = asyncRead;
1033
1034                         if (r != null) {
1035                                 string msg;
1036                                 WebException wex;
1037                                 if (exc == null) {
1038                                         msg = "Error: " + status;
1039                                         wex = new WebException (msg, status);
1040                                 } else {
1041                                         msg = String.Format ("Error: {0} ({1})", status, exc.Message);
1042                                         wex = new WebException (msg, exc, status);
1043                                 }
1044                                 r.SetCompleted (false, wex);
1045                                 r.DoCallback ();
1046                         }
1047                 }
1048
1049                 internal void SendRequestHeaders (bool propagate_error)
1050                 {
1051                         StringBuilder req = new StringBuilder ();
1052                         string query;
1053                         if (!ProxyQuery) {
1054                                 query = actualUri.PathAndQuery;
1055                         } else if (actualUri.IsDefaultPort) {
1056                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1057                                                                         actualUri.Host,
1058                                                                         actualUri.PathAndQuery);
1059                         } else {
1060                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
1061                                                                            actualUri.Host,
1062                                                                            actualUri.Port,
1063                                                                            actualUri.PathAndQuery);
1064                         }
1065
1066                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1067                                 actualVersion = servicePoint.ProtocolVersion;
1068                         } else {
1069                                 actualVersion = version;
1070                         }
1071
1072                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1073                                                                 actualVersion.Major, actualVersion.Minor);
1074                         req.Append (GetHeaders ());
1075                         string reqstr = req.ToString ();
1076                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
1077                         try {
1078                                 writeStream.SetHeaders (bytes);
1079                         } catch (WebException wexc) {
1080                                 SetWriteStreamError (wexc.Status, wexc);
1081                                 if (propagate_error)
1082                                         throw;
1083                         } catch (Exception exc) {
1084                                 SetWriteStreamError (WebExceptionStatus.SendFailure, exc);
1085                                 if (propagate_error)
1086                                         throw;
1087                         }
1088                 }
1089
1090                 internal void SetWriteStream (WebConnectionStream stream)
1091                 {
1092                         if (Aborted)
1093                                 return;
1094
1095                         writeStream = stream;
1096                         if (bodyBuffer != null) {
1097                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1098                                 contentLength = bodyBufferLength;
1099                                 writeStream.SendChunked = false;
1100                         }
1101
1102                         SendRequestHeaders (false);
1103
1104                         haveRequest = true;
1105
1106                         if (bodyBuffer != null) {
1107                                 // The body has been written and buffered. The request "user"
1108                                 // won't write it again, so we must do it.
1109                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1110                                 bodyBuffer = null;
1111                                 writeStream.Close ();
1112                         } else if (method != "HEAD" && method != "GET" && method != "MKCOL" && method != "CONNECT" &&
1113                                         method != "DELETE" && method != "TRACE") {
1114                                 if (getResponseCalled && !writeStream.RequestWritten)
1115                                         writeStream.WriteRequest ();
1116                         }
1117
1118                         if (asyncWrite != null) {
1119                                 asyncWrite.SetCompleted (false, stream);
1120                                 asyncWrite.DoCallback ();
1121                                 asyncWrite = null;
1122                         }
1123                 }
1124
1125                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1126                 {
1127                         if (Aborted)
1128                                 return;
1129                         lock (locker) {
1130                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1131                         WebAsyncResult r = asyncRead;
1132                         if (r == null)
1133                                 r = asyncWrite;
1134
1135                         WebException wexc;
1136                         if (e is WebException) {
1137                                 wexc = (WebException) e;
1138                         } else {
1139                                 wexc = new WebException (msg, e, status, null);
1140                         }
1141                         if (r != null) {
1142                                 if (!r.IsCompleted) {
1143                                         r.SetCompleted (false, wexc);
1144                                         r.DoCallback ();
1145                                 } else if (r == asyncWrite) {
1146                                         saved_exc = wexc;
1147                                 }
1148                                 haveResponse = true;
1149                                 asyncRead = null;
1150                                 asyncWrite = null;
1151                         } else {
1152                                 haveResponse = true;
1153                                 saved_exc = wexc;
1154                         }
1155                         }
1156                 }
1157
1158                 void CheckSendError (WebConnectionData data)
1159                 {
1160                         // Got here, but no one called GetResponse
1161                         int status = data.StatusCode;
1162                         if (status < 400 || status == 401 || status == 407)
1163                                 return;
1164
1165                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1166                                 // The request has not been completely sent and we got here!
1167                                 // We should probably just close and cause an error in any case,
1168                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1169                                 webResponse.ReadAll ();
1170                         }
1171                 }
1172
1173                 void HandleNtlmAuth (WebAsyncResult r)
1174                 {
1175                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1176                         if (wce != null) {
1177                                 WebConnection cnc = wce.Connection;
1178                                 cnc.PriorityRequest = this;
1179                                 bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1180                                 ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1181                                 if (creds != null) {
1182                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1183                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1184                                 }
1185                         }
1186                         r.Reset ();
1187                         haveResponse = false;
1188                         webResponse.ReadAll ();
1189                         webResponse = null;
1190                 }
1191
1192                 internal void SetResponseData (WebConnectionData data)
1193                 {
1194                         lock (locker) {
1195                         if (Aborted) {
1196                                 if (data.stream != null)
1197                                         data.stream.Close ();
1198                                 return;
1199                         }
1200
1201                         WebException wexc = null;
1202                         try {
1203                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1204                         } catch (Exception e) {
1205                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1206                                 if (data.stream != null)
1207                                         data.stream.Close ();
1208                         }
1209
1210                         if (wexc == null && (method == "POST" || method == "PUT")) {
1211                                 lock (locker) {
1212                                         CheckSendError (data);
1213                                         if (saved_exc != null)
1214                                                 wexc = (WebException) saved_exc;
1215                                 }
1216                         }
1217
1218                         WebAsyncResult r = asyncRead;
1219
1220                         bool forced = false;
1221                         if (r == null && webResponse != null) {
1222                                 // This is a forced completion (302, 204)...
1223                                 forced = true;
1224                                 r = new WebAsyncResult (null, null);
1225                                 r.SetCompleted (false, webResponse);
1226                         }
1227
1228                         if (r != null) {
1229                                 if (wexc != null) {
1230                                         r.SetCompleted (false, wexc);
1231                                         r.DoCallback ();
1232                                         return;
1233                                 }
1234
1235                                 bool redirected;
1236                                 try {
1237                                         redirected = CheckFinalStatus (r);
1238                                         if (!redirected) {
1239                                                 if (is_ntlm_auth && authCompleted && webResponse != null
1240                                                         && (int)webResponse.StatusCode < 400) {
1241                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1242                                                         if (wce != null) {
1243                                                                 WebConnection cnc = wce.Connection;
1244                                                                 cnc.NtlmAuthenticated = true;
1245                                                         }
1246                                                 }
1247
1248                                                 // clear internal buffer so that it does not
1249                                                 // hold possible big buffer (bug #397627)
1250                                                 if (writeStream != null)
1251                                                         writeStream.KillBuffer ();
1252
1253                                                 haveResponse = true;
1254                                                 r.SetCompleted (false, webResponse);
1255                                                 r.DoCallback ();
1256                                         } else {
1257                                                 if (webResponse != null) {
1258                                                         if (is_ntlm_auth) {
1259                                                                 HandleNtlmAuth (r);
1260                                                                 return;
1261                                                         }
1262                                                         webResponse.Close ();
1263                                                 }
1264                                                 haveResponse = false;
1265                                                 webResponse = null;
1266                                                 r.Reset ();
1267                                                 servicePoint = GetServicePoint ();
1268                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1269                                         }
1270                                 } catch (WebException wexc2) {
1271                                         if (forced) {
1272                                                 saved_exc = wexc2;
1273                                                 haveResponse = true;
1274                                         }
1275                                         r.SetCompleted (false, wexc2);
1276                                         r.DoCallback ();
1277                                         return;
1278                                 } catch (Exception ex) {
1279                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1280                                         if (forced) {
1281                                                 saved_exc = wexc;
1282                                                 haveResponse = true;
1283                                         }
1284                                         r.SetCompleted (false, wexc);
1285                                         r.DoCallback ();
1286                                         return;
1287                                 }
1288                         }
1289                         }
1290                 }
1291
1292                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1293                 {
1294                         authCompleted = false;
1295                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1296                                 return false;
1297
1298                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1299                         if (isProxy && (proxy == null || proxy.Credentials == null))
1300                                 return false;
1301
1302                         string [] authHeaders = response.Headers.GetValues ( (isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate");
1303                         if (authHeaders == null || authHeaders.Length == 0)
1304                                 return false;
1305
1306                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1307                         Authorization auth = null;
1308                         foreach (string authHeader in authHeaders) {
1309                                 auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1310                                 if (auth != null)
1311                                         break;
1312                         }
1313                         if (auth == null)
1314                                 return false;
1315                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1316                         authCompleted = auth.Complete;
1317                         is_ntlm_auth = (auth.Module.AuthenticationType == "NTLM");
1318                         return true;
1319                 }
1320
1321                 // Returns true if redirected
1322                 bool CheckFinalStatus (WebAsyncResult result)
1323                 {
1324                         if (result.GotException)
1325                                 throw result.Exception;
1326
1327                         Exception throwMe = result.Exception;
1328                         bodyBuffer = null;
1329
1330                         HttpWebResponse resp = result.Response;
1331                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1332                         HttpStatusCode code = 0;
1333                         if (throwMe == null && webResponse != null) {
1334                                 code = webResponse.StatusCode;
1335                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1336                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1337                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1338                                                 // Keep the written body, so it can be rewritten in the retry
1339                                                 if (InternalAllowBuffering) {
1340                                                         bodyBuffer = writeStream.WriteBuffer;
1341                                                         bodyBufferLength = writeStream.WriteBufferLength;
1342                                                         return true;
1343                                                 } else if (method != "PUT" && method != "POST") {
1344                                                         return true;
1345                                                 }
1346
1347                                                 writeStream.InternalClose ();
1348                                                 writeStream = null;
1349                                                 webResponse.Close ();
1350                                                 webResponse = null;
1351
1352                                                 throw new WebException ("This request requires buffering " +
1353                                                                         "of data for authentication or " +
1354                                                                         "redirection to be sucessful.");
1355                                         }
1356                                 }
1357
1358                                 if ((int) code >= 400) {
1359                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1360                                                                     (int) code, webResponse.StatusDescription);
1361                                         throwMe = new WebException (err, null, protoError, webResponse);
1362                                         webResponse.ReadAll ();
1363                                 } else if ((int) code == 304 && allowAutoRedirect) {
1364                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1365                                                                     (int) code, webResponse.StatusDescription);
1366                                         throwMe = new WebException (err, null, protoError, webResponse);
1367                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1368                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1369                                                                     protoError, webResponse);
1370                                         webResponse.ReadAll ();
1371                                 }
1372                         }
1373
1374                         if (throwMe == null) {
1375                                 bool b = false;
1376                                 int c = (int) code;
1377                                 if (allowAutoRedirect && c >= 300) {
1378                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1379                                                 bodyBuffer = writeStream.WriteBuffer;
1380                                                 bodyBufferLength = writeStream.WriteBufferLength;
1381                                         }
1382                                         b = Redirect (result, code);
1383                                 }
1384
1385                                 if (resp != null && c >= 300 && c != 304)
1386                                         resp.ReadAll ();
1387
1388                                 return b;
1389                         }
1390
1391                         if (writeStream != null) {
1392                                 writeStream.InternalClose ();
1393                                 writeStream = null;
1394                         }
1395
1396                         webResponse = null;
1397
1398                         throw throwMe;
1399                 }
1400         }
1401 }
1402