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                 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 #if NET_2_0
 103                 DecompressionMethods auto_decomp;
 104 #endif
 105 #if NET_1_1
 106                 int maxResponseHeadersLength;
 107                 static int defaultMaxResponseHeadersLength;
 108                 int readWriteTimeout = 300000; // ms
 109
 110                 // Constructors
 111                 static HttpWebRequest ()
 112                 {
 113                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 114                         defaultMaxResponseHeadersLength = 64 * 1024;
 115                         if (config != null) {
 116                                 int x = config.MaxResponseHeadersLength;
 117                                 if (x != -1)
 118                                         x *= 64;
 119
 120                                 defaultMaxResponseHeadersLength = x;
 121                         }
 122                 }
 123 #endif
 124
 125 #if NET_2_1
 126                 public
 127 #else
 128                 internal
 129 #endif
 130                 HttpWebRequest (Uri uri)
 131                 {
 132                         this.requestUri = uri;
 133                         this.actualUri = uri;
 134                         this.proxy = GlobalProxySelection.Select;
 135                 }
 136
 137 #if NET_2_0
 138                 [Obsolete ("Serialization is obsoleted for this type", false)]
 139 #endif
 140                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 141                 {
 142                         SerializationInfo info = serializationInfo;
 143
 144                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 145                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 146                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 147                         allowBuffering = info.GetBoolean ("allowBuffering");
 148                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 149                         connectionGroup = info.GetString ("connectionGroup");
 150                         contentLength = info.GetInt64 ("contentLength");
 151                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 152                         keepAlive = info.GetBoolean ("keepAlive");
 153                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 154                         mediaType = info.GetString ("mediaType");
 155                         method = info.GetString ("method");
 156                         initialMethod = info.GetString ("initialMethod");
 157                         pipelined = info.GetBoolean ("pipelined");
 158                         version = (Version) info.GetValue ("version", typeof (Version));
 159                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 160                         sendChunked = info.GetBoolean ("sendChunked");
 161                         timeout = info.GetInt32 ("timeout");
 162                         redirects = info.GetInt32 ("redirects");
 163                 }
 164
 165                 // Properties
 166
 167                 internal bool UsesNtlmAuthentication {
 168                         get { return is_ntlm_auth; }
 169                 }
 170
 171                 public string Accept {
 172                         get { return webHeaders ["Accept"]; }
 173                         set {
 174                                 CheckRequestStarted ();
 175                                 webHeaders.RemoveAndAdd ("Accept", value);
 176                         }
 177                 }
 178
 179                 public Uri Address {
 180                         get { return actualUri; }
 181                 }
 182
 183                 public bool AllowAutoRedirect {
 184                         get { return allowAutoRedirect; }
 185                         set { this.allowAutoRedirect = value; }
 186                 }
 187
 188                 public bool AllowWriteStreamBuffering {
 189                         get { return allowBuffering; }
 190                         set { allowBuffering = value; }
 191                 }
 192
 193 #if NET_2_0
 194                 static Exception GetMustImplement ()
 195                 {
 196                         return new NotImplementedException ();
 197                 }
 198
 199                 public DecompressionMethods AutomaticDecompression
 200                 {
 201                         get {
 202                                 return auto_decomp;
 203                         }
 204                         set {
 205                                 CheckRequestStarted ();
 206                                 auto_decomp = value;
 207                         }
 208                 }
 209 #endif
 210
 211                 internal bool InternalAllowBuffering {
 212                         get {
 213                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 214                                                         method != "MKCOL" && method != "CONNECT" &&
 215                                                         method != "DELETE" && method != "TRACE"));
 216                         }
 217                 }
 218
 219                 public X509CertificateCollection ClientCertificates {
 220                         get {
 221                                 if (certificates == null)
 222                                         certificates = new X509CertificateCollection ();
 223
 224                                 return certificates;
 225                         }
 226 #if NET_2_0
 227                         [MonoTODO]
 228                         set {
 229                                 throw GetMustImplement ();
 230                         }
 231 #endif
 232                 }
 233
 234                 public string Connection {
 235                         get { return webHeaders ["Connection"]; }
 236                         set {
 237                                 CheckRequestStarted ();
 238                                 string val = value;
 239                                 if (val != null)
 240                                         val = val.Trim ().ToLower ();
 241
 242                                 if (val == null || val.Length == 0) {
 243                                         webHeaders.RemoveInternal ("Connection");
 244                                         return;
 245                                 }
 246
 247                                 if (val == "keep-alive" || val == "close")
 248                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 249
 250                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 251                                         value = value + ", Keep-Alive";
 252
 253                                 webHeaders.RemoveAndAdd ("Connection", value);
 254                         }
 255                 }
 256
 257                 public override string ConnectionGroupName {
 258                         get { return connectionGroup; }
 259                         set { connectionGroup = value; }
 260                 }
 261
 262                 public override long ContentLength {
 263                         get { return contentLength; }
 264                         set {
 265                                 CheckRequestStarted ();
 266                                 if (value < 0)
 267                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 268
 269                                 contentLength = value;
 270                         }
 271                 }
 272
 273                 internal long InternalContentLength {
 274                         set { contentLength = value; }
 275                 }
 276
 277                 public override string ContentType {
 278                         get { return webHeaders ["Content-Type"]; }
 279                         set {
 280                                 if (value == null || value.Trim().Length == 0) {
 281                                         webHeaders.RemoveInternal ("Content-Type");
 282                                         return;
 283                                 }
 284                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 285                         }
 286                 }
 287
 288                 public HttpContinueDelegate ContinueDelegate {
 289                         get { return continueDelegate; }
 290                         set { continueDelegate = value; }
 291                 }
 292
 293                 public CookieContainer CookieContainer {
 294                         get { return cookieContainer; }
 295                         set { cookieContainer = value; }
 296                 }
 297
 298                 public override ICredentials Credentials {
 299                         get { return credentials; }
 300                         set { credentials = value; }
 301                 }
 302
 303 #if NET_2_0
 304                 [MonoTODO]
 305                 public static new RequestCachePolicy DefaultCachePolicy
 306                 {
 307                         get {
 308                                 throw GetMustImplement ();
 309                         }
 310                         set {
 311                                 throw GetMustImplement ();
 312                         }
 313                 }
 314
 315                 [MonoTODO]
 316                 public static int DefaultMaximumErrorResponseLength
 317                 {
 318                         get {
 319                                 throw GetMustImplement ();
 320                         }
 321                         set {
 322                                 throw GetMustImplement ();
 323                         }
 324                 }
 325 #endif
 326
 327                 public string Expect {
 328                         get { return webHeaders ["Expect"]; }
 329                         set {
 330                                 CheckRequestStarted ();
 331                                 string val = value;
 332                                 if (val != null)
 333                                         val = val.Trim ().ToLower ();
 334
 335                                 if (val == null || val.Length == 0) {
 336                                         webHeaders.RemoveInternal ("Expect");
 337                                         return;
 338                                 }
 339
 340                                 if (val == "100-continue")
 341                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 342                                                                      "value");
 343                                 webHeaders.RemoveAndAdd ("Expect", value);
 344                         }
 345                 }
 346
 347                 public bool HaveResponse {
 348                         get { return haveResponse; }
 349                 }
 350
 351                 public override WebHeaderCollection Headers {
 352                         get { return webHeaders; }
 353                         set {
 354                                 CheckRequestStarted ();
 355                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 356                                 int count = value.Count;
 357                                 for (int i = 0; i < count; i++)
 358                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 359
 360                                 webHeaders = newHeaders;
 361                         }
 362                 }
 363
 364                 public DateTime IfModifiedSince {
 365                         get {
 366                                 string str = webHeaders ["If-Modified-Since"];
 367                                 if (str == null)
 368                                         return DateTime.Now;
 369                                 try {
 370                                         return MonoHttpDate.Parse (str);
 371                                 } catch (Exception) {
 372                                         return DateTime.Now;
 373                                 }
 374                         }
 375                         set {
 376                                 CheckRequestStarted ();
 377                                 // rfc-1123 pattern
 378                                 webHeaders.SetInternal ("If-Modified-Since",
 379                                         value.ToUniversalTime ().ToString ("r", null));
 380                                 // TODO: check last param when using different locale
 381                         }
 382                 }
 383
 384                 public bool KeepAlive {
 385                         get {
 386                                 return keepAlive;
 387                         }
 388                         set {
 389                                 keepAlive = value;
 390                         }
 391                 }
 392
 393                 public int MaximumAutomaticRedirections {
 394                         get { return maxAutoRedirect; }
 395                         set {
 396                                 if (value <= 0)
 397                                         throw new ArgumentException ("Must be > 0", "value");
 398
 399                                 maxAutoRedirect = value;
 400                         }
 401                 }
 402
 403 #if NET_1_1
 404                 [MonoTODO ("Use this")]
 405                 public int MaximumResponseHeadersLength {
 406                         get { return maxResponseHeadersLength; }
 407                         set { maxResponseHeadersLength = value; }
 408                 }
 409
 410                 [MonoTODO ("Use this")]
 411                 public static int DefaultMaximumResponseHeadersLength {
 412                         get { return defaultMaxResponseHeadersLength; }
 413                         set { defaultMaxResponseHeadersLength = value; }
 414                 }
 415
 416                 public
 417 #else
 418                 internal
 419 #endif
 420                 int ReadWriteTimeout {
 421                         get { return readWriteTimeout; }
 422                         set {
 423                                 if (requestSent)
 424                                         throw new InvalidOperationException ("The request has already been sent.");
 425
 426                                 if (value < -1)
 427                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 428
 429                                 readWriteTimeout = value;
 430                         }
 431                 }
 432
 433                 public string MediaType {
 434                         get { return mediaType; }
 435                         set {
 436                                 mediaType = value;
 437                         }
 438                 }
 439
 440                 public override string Method {
 441                         get { return this.method; }
 442                         set {
 443                                 if (value == null || value.Trim () == "")
 444                                         throw new ArgumentException ("not a valid method");
 445
 446                                 method = value;
 447                         }
 448                 }
 449
 450                 public bool Pipelined {
 451                         get { return pipelined; }
 452                         set { pipelined = value; }
 453                 }
 454
 455                 public override bool PreAuthenticate {
 456                         get { return preAuthenticate; }
 457                         set { preAuthenticate = value; }
 458                 }
 459
 460                 public Version ProtocolVersion {
 461                         get { return version; }
 462                         set {
 463                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 464                                         throw new ArgumentException ("value");
 465
 466                                 version = value;
 467                         }
 468                 }
 469
 470                 public override IWebProxy Proxy {
 471                         get { return proxy; }
 472                         set {
 473                                 CheckRequestStarted ();
 474 #if ONLY_1_1
 475                                 if (value == null)
 476                                         throw new ArgumentNullException ("value");
 477 #endif
 478
 479                                 proxy = value;
 480                                 servicePoint = null; // we may need a new one
 481                         }
 482                 }
 483
 484                 public string Referer {
 485                         get { return webHeaders ["Referer"]; }
 486                         set {
 487                                 CheckRequestStarted ();
 488                                 if (value == null || value.Trim().Length == 0) {
 489                                         webHeaders.RemoveInternal ("Referer");
 490                                         return;
 491                                 }
 492                                 webHeaders.SetInternal ("Referer", value);
 493                         }
 494                 }
 495
 496                 public override Uri RequestUri {
 497                         get { return requestUri; }
 498                 }
 499
 500                 public bool SendChunked {
 501                         get { return sendChunked; }
 502                         set {
 503                                 CheckRequestStarted ();
 504                                 sendChunked = value;
 505                         }
 506                 }
 507
 508                 public ServicePoint ServicePoint {
 509                         get { return GetServicePoint (); }
 510                 }
 511
 512                 public override int Timeout {
 513                         get { return timeout; }
 514                         set {
 515                                 if (value < -1)
 516                                         throw new ArgumentOutOfRangeException ("value");
 517
 518                                 timeout = value;
 519                         }
 520                 }
 521
 522                 public string TransferEncoding {
 523                         get { return webHeaders ["Transfer-Encoding"]; }
 524                         set {
 525                                 CheckRequestStarted ();
 526                                 string val = value;
 527                                 if (val != null)
 528                                         val = val.Trim ().ToLower ();
 529
 530                                 if (val == null || val.Length == 0) {
 531                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 532                                         return;
 533                                 }
 534
 535                                 if (val == "chunked")
 536                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 537
 538                                 if (!sendChunked)
 539                                         throw new ArgumentException ("SendChunked must be True", "value");
 540
 541                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 542                         }
 543                 }
 544
 545 #if NET_2_0
 546                 public override bool UseDefaultCredentials
 547                 {
 548                         get { return CredentialCache.DefaultCredentials == Credentials; }
 549                         set { Credentials = value ? CredentialCache.DefaultCredentials : null; }
 550                 }
 551 #endif
 552
 553                 public string UserAgent {
 554                         get { return webHeaders ["User-Agent"]; }
 555                         set { webHeaders.SetInternal ("User-Agent", value); }
 556                 }
 557
 558 #if NET_1_1
 559                 bool unsafe_auth_blah;
 560                 public bool UnsafeAuthenticatedConnectionSharing
 561                 {
 562                         get { return unsafe_auth_blah; }
 563                         set { unsafe_auth_blah = value; }
 564                 }
 565 #endif
 566
 567                 internal bool GotRequestStream {
 568                         get { return gotRequestStream; }
 569                 }
 570
 571                 internal bool ExpectContinue {
 572                         get { return expectContinue; }
 573                         set { expectContinue = value; }
 574                 }
 575
 576                 internal Uri AuthUri {
 577                         get { return actualUri; }
 578                 }
 579
 580                 internal bool ProxyQuery {
 581                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 582                 }
 583
 584                 // Methods
 585
 586                 internal ServicePoint GetServicePoint ()
 587                 {
 588                         lock (locker) {
 589                                 if (hostChanged || servicePoint == null) {
 590                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 591                                         hostChanged = false;
 592                                 }
 593                         }
 594
 595                         return servicePoint;
 596                 }
 597
 598                 public void AddRange (int range)
 599                 {
 600                         AddRange ("bytes", range);
 601                 }
 602
 603                 public void AddRange (int from, int to)
 604                 {
 605                         AddRange ("bytes", from, to);
 606                 }
 607
 608                 public void AddRange (string rangeSpecifier, int range)
 609                 {
 610                         if (rangeSpecifier == null)
 611                                 throw new ArgumentNullException ("rangeSpecifier");
 612                         string value = webHeaders ["Range"];
 613                         if (value == null || value.Length == 0)
 614                                 value = rangeSpecifier + "=";
 615                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 616                                 value += ",";
 617                         else
 618                                 throw new InvalidOperationException ("rangeSpecifier");
 619                         webHeaders.RemoveAndAdd ("Range", value + range + "-");
 620                 }
 621
 622                 public void AddRange (string rangeSpecifier, int from, int to)
 623                 {
 624                         if (rangeSpecifier == null)
 625                                 throw new ArgumentNullException ("rangeSpecifier");
 626                         if (from < 0 || to < 0 || from > to)
 627                                 throw new ArgumentOutOfRangeException ();
 628                         string value = webHeaders ["Range"];
 629                         if (value == null || value.Length == 0)
 630                                 value = rangeSpecifier + "=";
 631                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 632                                 value += ",";
 633                         else
 634                                 throw new InvalidOperationException ("rangeSpecifier");
 635                         webHeaders.RemoveAndAdd ("Range", value + from + "-" + to);
 636                 }
 637 #if !NET_2_0
 638                 public override int GetHashCode ()
 639                 {
 640                         return base.GetHashCode ();
 641                 }
 642 #endif
 643
 644                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 645                 {
 646                         if (Aborted)
 647                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 648
 649                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 650                                         method == "TRACE" || method == "DELETE");
 651                         if (method == null || !send)
 652                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 653
 654                         if (contentLength == -1 && !sendChunked && !allowBuffering && KeepAlive)
 655                                 throw new ProtocolViolationException ("Content-Length not set");
 656
 657                         string transferEncoding = TransferEncoding;
 658                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 659                                 throw new ProtocolViolationException ("SendChunked should be true.");
 660
 661                         lock (locker)
 662                         {
 663                                 if (asyncWrite != null) {
 664                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 665                                                                 "method while a previous call is still in progress.");
 666                                 }
 667
 668                                 asyncWrite = new WebAsyncResult (this, callback, state);
 669                                 initialMethod = method;
 670                                 if (haveRequest) {
 671                                         if (writeStream != null) {
 672                                                 asyncWrite.SetCompleted (true, writeStream);
 673                                                 asyncWrite.DoCallback ();
 674                                                 return asyncWrite;
 675                                         }
 676                                 }
 677
 678                                 gotRequestStream = true;
 679                                 WebAsyncResult result = asyncWrite;
 680                                 if (!requestSent) {
 681                                         requestSent = true;
 682                                         redirects = 0;
 683                                         servicePoint = GetServicePoint ();
 684                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 685                                 }
 686                                 return result;
 687                         }
 688                 }
 689
 690                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 691                 {
 692                         if (asyncResult == null)
 693                                 throw new ArgumentNullException ("asyncResult");
 694
 695                         WebAsyncResult result = asyncResult as WebAsyncResult;
 696                         if (result == null)
 697                                 throw new ArgumentException ("Invalid IAsyncResult");
 698
 699                         asyncWrite = result;
 700                         result.WaitUntilComplete ();
 701
 702                         Exception e = result.Exception;
 703                         if (e != null)
 704                                 throw e;
 705
 706                         return result.WriteStream;
 707                 }
 708
 709                 public override Stream GetRequestStream()
 710                 {
 711                         IAsyncResult asyncResult = asyncWrite;
 712                         if (asyncResult == null) {
 713                                 asyncResult = BeginGetRequestStream (null, null);
 714                                 asyncWrite = (WebAsyncResult) asyncResult;
 715                         }
 716
 717                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 718                                 Abort ();
 719                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 720                         }
 721
 722                         return EndGetRequestStream (asyncResult);
 723                 }
 724
 725                 void CheckIfForceWrite ()
 726                 {
 727                         if (writeStream == null || writeStream.RequestWritten|| contentLength < 0 || !InternalAllowBuffering)
 728                                 return;
 729
 730                         // This will write the POST/PUT if the write stream already has the expected
 731                         // amount of bytes in it (ContentLength) (bug #77753).
 732                         if (writeStream.WriteBufferLength == contentLength)
 733                                 writeStream.WriteRequest ();
 734                 }
 735
 736                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 737                 {
 738                         if (Aborted)
 739                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 740
 741                         if (method == null)
 742                                 throw new ProtocolViolationException ("Method is null.");
 743
 744 #if !NET_2_0
 745                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 746                                                 method == "TRACE" || method == "DELETE");
 747                         if (send && contentLength < 0 && !sendChunked && !allowBuffering && KeepAlive)
 748                                 throw new ProtocolViolationException ("Buffering is disabled, ContentLength is negative and SendChunked is disabled.");
 749
 750                         if (!send && (contentLength > -1 || sendChunked))
 751                                 throw new ProtocolViolationException ("ContentLength can't be set for non-write operations.");
 752 #endif
 753
 754                         string transferEncoding = TransferEncoding;
 755                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 756                                 throw new ProtocolViolationException ("SendChunked should be true.");
 757
 758                         Monitor.Enter (locker);
 759                         getResponseCalled = true;
 760                         if (asyncRead != null && !haveResponse) {
 761                                 Monitor.Exit (locker);
 762                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 763                                                         "method while a previous call is still in progress.");
 764                         }
 765
 766                         CheckIfForceWrite ();
 767                         asyncRead = new WebAsyncResult (this, callback, state);
 768                         WebAsyncResult aread = asyncRead;
 769                         initialMethod = method;
 770                         if (haveResponse) {
 771                                 Exception saved = saved_exc;
 772                                 if (webResponse != null) {
 773                                         Monitor.Exit (locker);
 774                                         if (saved == null) {
 775                                                 aread.SetCompleted (true, webResponse);
 776                                         } else {
 777                                                 aread.SetCompleted (true, saved);
 778                                         }
 779                                         aread.DoCallback ();
 780                                         return aread;
 781                                 } else if (saved != null) {
 782                                         Monitor.Exit (locker);
 783                                         aread.SetCompleted (true, saved);
 784                                         aread.DoCallback ();
 785                                         return aread;
 786                                 }
 787                         }
 788
 789                         if (!requestSent) {
 790                                 requestSent = true;
 791                                 redirects = 0;
 792                                 servicePoint = GetServicePoint ();
 793                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 794                         }
 795
 796                         Monitor.Exit (locker);
 797                         return aread;
 798                 }
 799
 800                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 801                 {
 802                         if (asyncResult == null)
 803                                 throw new ArgumentNullException ("asyncResult");
 804
 805                         WebAsyncResult result = asyncResult as WebAsyncResult;
 806                         if (result == null)
 807                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 808
 809                         if (!result.WaitUntilComplete (timeout, false)) {
 810                                 Abort ();
 811                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 812                         }
 813
 814                         if (result.GotException)
 815                                 throw result.Exception;
 816
 817                         return result.Response;
 818                 }
 819
 820                 public override WebResponse GetResponse()
 821                 {
 822                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 823                         return EndGetResponse (result);
 824                 }
 825
 826                 internal bool FinishedReading {
 827                         get { return finished_reading; }
 828                         set { finished_reading = value; }
 829                 }
 830
 831                 internal bool Aborted {
 832                         get { return Interlocked.CompareExchange (ref aborted, 0, 0) == 1; }
 833                 }
 834
 835                 public override void Abort ()
 836                 {
 837                         if (Interlocked.CompareExchange (ref aborted, 1, 0) == 1)
 838                                 return;
 839
 840                         if (haveResponse && finished_reading)
 841                                 return;
 842
 843                         haveResponse = true;
 844                         if (abortHandler != null) {
 845                                 try {
 846                                         abortHandler (this, EventArgs.Empty);
 847                                 } catch (Exception) {}
 848                                 abortHandler = null;
 849                         }
 850
 851                         if (asyncWrite != null) {
 852                                 WebAsyncResult r = asyncWrite;
 853                                 if (!r.IsCompleted) {
 854                                         try {
 855                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 856                                                 r.SetCompleted (false, wexc);
 857                                                 r.DoCallback ();
 858                                         } catch {}
 859                                 }
 860                                 asyncWrite = null;
 861                         }
 862
 863                         if (asyncRead != null) {
 864                                 WebAsyncResult r = asyncRead;
 865                                 if (!r.IsCompleted) {
 866                                         try {
 867                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 868                                                 r.SetCompleted (false, wexc);
 869                                                 r.DoCallback ();
 870                                         } catch {}
 871                                 }
 872                                 asyncRead = null;
 873                         }
 874
 875                         if (writeStream != null) {
 876                                 try {
 877                                         writeStream.Close ();
 878                                         writeStream = null;
 879                                 } catch {}
 880                         }
 881
 882                         if (webResponse != null) {
 883                                 try {
 884                                         webResponse.Close ();
 885                                         webResponse = null;
 886                                 } catch {}
 887                         }
 888                 }
 889
 890                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 891                                                   StreamingContext streamingContext)
 892                 {
 893                         GetObjectData (serializationInfo, streamingContext);
 894                 }
 895
 896 #if NET_2_0
 897                 protected override
 898 #endif
 899                 void GetObjectData (SerializationInfo serializationInfo,
 900                                     StreamingContext streamingContext)
 901                 {
 902                         SerializationInfo info = serializationInfo;
 903
 904                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 905                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 906                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 907                         info.AddValue ("allowBuffering", allowBuffering);
 908                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 909                         info.AddValue ("connectionGroup", connectionGroup);
 910                         info.AddValue ("contentLength", contentLength);
 911                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 912                         info.AddValue ("keepAlive", keepAlive);
 913                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 914                         info.AddValue ("mediaType", mediaType);
 915                         info.AddValue ("method", method);
 916                         info.AddValue ("initialMethod", initialMethod);
 917                         info.AddValue ("pipelined", pipelined);
 918                         info.AddValue ("version", version, typeof (Version));
 919                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 920                         info.AddValue ("sendChunked", sendChunked);
 921                         info.AddValue ("timeout", timeout);
 922                         info.AddValue ("redirects", redirects);
 923                 }
 924
 925                 void CheckRequestStarted ()
 926                 {
 927                         if (requestSent)
 928                                 throw new InvalidOperationException ("request started");
 929                 }
 930
 931                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 932                 {
 933                         if (continueDelegate != null)
 934                                 continueDelegate (statusCode, headers);
 935                 }
 936
 937                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 938                 {
 939                         redirects++;
 940                         Exception e = null;
 941                         string uriString = null;
 942
 943                         switch (code) {
 944                         case HttpStatusCode.Ambiguous: // 300
 945                                 e = new WebException ("Ambiguous redirect.");
 946                                 break;
 947                         case HttpStatusCode.MovedPermanently: // 301
 948                         case HttpStatusCode.Redirect: // 302
 949                         case HttpStatusCode.TemporaryRedirect: // 307
 950                                 /* MS follows the redirect for POST too
 951                                 if (method != "GET" && method != "HEAD") // 10.3
 952                                         return false;
 953                                 */
 954
 955                                 contentLength = 0;
 956                                 bodyBufferLength = 0;
 957                                 bodyBuffer = null;
 958                                 method = "GET";
 959                                 uriString = webResponse.Headers ["Location"];
 960                                 break;
 961                         case HttpStatusCode.SeeOther: //303
 962                                 method = "GET";
 963                                 uriString = webResponse.Headers ["Location"];
 964                                 break;
 965                         case HttpStatusCode.NotModified: // 304
 966                                 return false;
 967                         case HttpStatusCode.UseProxy: // 305
 968                                 e = new NotImplementedException ("Proxy support not available.");
 969                                 break;
 970                         case HttpStatusCode.Unused: // 306
 971                         default:
 972                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 973                                 break;
 974                         }
 975
 976                         if (e != null)
 977                                 throw e;
 978
 979                         if (uriString == null)
 980                                 throw new WebException ("No Location header found for " + (int) code,
 981                                                         WebExceptionStatus.ProtocolError);
 982
 983                         Uri prev = actualUri;
 984                         try {
 985                                 actualUri = new Uri (actualUri, uriString);
 986                         } catch (Exception) {
 987                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 988                                                                         uriString, (int) code),
 989                                                                         WebExceptionStatus.ProtocolError);
 990                         }
 991
 992                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 993                                         actualUri.Port != prev.Port);
 994                         return true;
 995                 }
 996
 997                 string GetHeaders ()
 998                 {
 999                         bool continue100 = false;
1000                         if (sendChunked) {
1001                                 continue100 = true;
1002                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
1003                                 webHeaders.RemoveInternal ("Content-Length");
1004                         } else if (contentLength != -1) {
1005                                 if (contentLength > 0)
1006                                         continue100 = true;
1007                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
1008                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1009                         }
1010
1011                         if (actualVersion == HttpVersion.Version11 && continue100 &&
1012                             servicePoint.SendContinue) { // RFC2616 8.2.3
1013                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
1014                                 expectContinue = true;
1015                         } else {
1016                                 webHeaders.RemoveInternal ("Expect");
1017                                 expectContinue = false;
1018                         }
1019
1020                         bool proxy_query = ProxyQuery;
1021                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
1022                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
1023                         Version proto_version = servicePoint.ProtocolVersion;
1024                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
1025
1026                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
1027                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
1028                         } else if (!keepAlive && version == HttpVersion.Version11) {
1029                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
1030                         }
1031
1032                         webHeaders.SetInternal ("Host", actualUri.Authority);
1033                         if (cookieContainer != null) {
1034                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
1035                                 if (cookieHeader != "")
1036                                         webHeaders.SetInternal ("Cookie", cookieHeader);
1037                         }
1038
1039 #if NET_2_0
1040                         string accept_encoding = null;
1041                         if ((auto_decomp & DecompressionMethods.GZip) != 0)
1042                                 accept_encoding = "gzip";
1043                         if ((auto_decomp & DecompressionMethods.Deflate) != 0)
1044                                 accept_encoding = accept_encoding != null ? "gzip, deflate" : "deflate";
1045                         if (accept_encoding != null)
1046                                 webHeaders.RemoveAndAdd ("Accept-Encoding", accept_encoding);
1047 #endif
1048                         if (!usedPreAuth && preAuthenticate)
1049                                 DoPreAuthenticate ();
1050
1051                         return webHeaders.ToString ();
1052                 }
1053
1054                 void DoPreAuthenticate ()
1055                 {
1056                         webHeaders.RemoveInternal ("Proxy-Authorization");
1057                         webHeaders.RemoveInternal ("Authorization");
1058                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1059                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1060                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1061                         if (auth == null)
1062                                 return;
1063
1064                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1065                         webHeaders [authHeader] = auth.Message;
1066                         usedPreAuth = true;
1067                 }
1068
1069                 internal void SetWriteStreamError (WebExceptionStatus status)
1070                 {
1071                         SetWriteStreamError (status, null);
1072                 }
1073
1074                 internal void SetWriteStreamError (WebExceptionStatus status, Exception exc)
1075                 {
1076                         if (Aborted)
1077                                 return;
1078
1079                         WebAsyncResult r = asyncWrite;
1080                         if (r == null)
1081                                 r = asyncRead;
1082
1083                         if (r != null) {
1084                                 string msg;
1085                                 WebException wex;
1086                                 if (exc == null) {
1087                                         msg = "Error: " + status;
1088                                         wex = new WebException (msg, status);
1089                                 } else {
1090                                         msg = String.Format ("Error: {0} ({1})", status, exc.Message);
1091                                         wex = new WebException (msg, exc, status);
1092                                 }
1093                                 r.SetCompleted (false, wex);
1094                                 r.DoCallback ();
1095                         }
1096                 }
1097
1098                 internal void SendRequestHeaders ()
1099                 {
1100                         StringBuilder req = new StringBuilder ();
1101                         string query;
1102                         if (!ProxyQuery) {
1103                                 query = actualUri.PathAndQuery;
1104                         } else if (actualUri.IsDefaultPort) {
1105                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1106                                                                         actualUri.Host,
1107                                                                         actualUri.PathAndQuery);
1108                         } else {
1109                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
1110                                                                            actualUri.Host,
1111                                                                            actualUri.Port,
1112                                                                            actualUri.PathAndQuery);
1113                         }
1114
1115                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1116                                 actualVersion = servicePoint.ProtocolVersion;
1117                         } else {
1118                                 actualVersion = version;
1119                         }
1120
1121                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1122                                                                 actualVersion.Major, actualVersion.Minor);
1123                         req.Append (GetHeaders ());
1124                         string reqstr = req.ToString ();
1125                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
1126                         try {
1127                                 writeStream.SetHeaders (bytes);
1128                         } catch (WebException wexc) {
1129                                 SetWriteStreamError (wexc.Status);
1130                         } catch (Exception) {
1131                                 SetWriteStreamError (WebExceptionStatus.SendFailure);
1132                         }
1133                 }
1134
1135                 internal void SetWriteStream (WebConnectionStream stream)
1136                 {
1137                         if (Aborted)
1138                                 return;
1139
1140                         writeStream = stream;
1141                         if (bodyBuffer != null) {
1142                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1143                                 contentLength = bodyBufferLength;
1144                                 writeStream.SendChunked = false;
1145                         }
1146
1147                         SendRequestHeaders ();
1148
1149                         haveRequest = true;
1150
1151                         if (bodyBuffer != null) {
1152                                 // The body has been written and buffered. The request "user"
1153                                 // won't write it again, so we must do it.
1154                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1155                                 bodyBuffer = null;
1156                                 writeStream.Close ();
1157                         } else if (method != "HEAD" && method != "GET" && method != "MKCOL" && method != "CONNECT" &&
1158                                         method != "DELETE" && method != "TRACE") {
1159                                 if (getResponseCalled && !writeStream.RequestWritten)
1160                                         writeStream.WriteRequest ();
1161                         }
1162
1163                         if (asyncWrite != null) {
1164                                 asyncWrite.SetCompleted (false, stream);
1165                                 asyncWrite.DoCallback ();
1166                                 asyncWrite = null;
1167                         }
1168                 }
1169
1170                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1171                 {
1172                         if (Aborted)
1173                                 return;
1174                         lock (locker) {
1175                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1176                         WebAsyncResult r = asyncRead;
1177                         if (r == null)
1178                                 r = asyncWrite;
1179
1180                         WebException wexc;
1181                         if (e is WebException) {
1182                                 wexc = (WebException) e;
1183                         } else {
1184                                 wexc = new WebException (msg, e, status, null);
1185                         }
1186                         if (r != null) {
1187                                 if (!r.IsCompleted) {
1188                                         r.SetCompleted (false, wexc);
1189                                         r.DoCallback ();
1190                                 } else if (r == asyncWrite) {
1191                                         saved_exc = wexc;
1192                                 }
1193                                 haveResponse = true;
1194                                 asyncRead = null;
1195                                 asyncWrite = null;
1196                         } else {
1197                                 haveResponse = true;
1198                                 saved_exc = wexc;
1199                         }
1200                         }
1201                 }
1202
1203                 void CheckSendError (WebConnectionData data)
1204                 {
1205                         // Got here, but no one called GetResponse
1206                         int status = data.StatusCode;
1207                         if (status < 400 || status == 401 || status == 407)
1208                                 return;
1209
1210                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1211                                 // The request has not been completely sent and we got here!
1212                                 // We should probably just close and cause an error in any case,
1213                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1214                                 webResponse.ReadAll ();
1215                         }
1216                 }
1217
1218                 void HandleNtlmAuth (WebAsyncResult r)
1219                 {
1220                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1221                         if (wce != null) {
1222                                 WebConnection cnc = wce.Connection;
1223                                 cnc.PriorityRequest = this;
1224                                 bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1225                                 ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1226                                 if (creds != null) {
1227                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1228 #if NET_1_1
1229                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1230 #endif
1231                                 }
1232                         }
1233                         r.Reset ();
1234                         haveResponse = false;
1235                         webResponse.ReadAll ();
1236                         webResponse = null;
1237                 }
1238
1239                 internal void SetResponseData (WebConnectionData data)
1240                 {
1241                         lock (locker) {
1242                         if (Aborted) {
1243                                 if (data.stream != null)
1244                                         data.stream.Close ();
1245                                 return;
1246                         }
1247
1248                         WebException wexc = null;
1249                         try {
1250                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1251                         } catch (Exception e) {
1252                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1253                                 if (data.stream != null)
1254                                         data.stream.Close ();
1255                         }
1256
1257                         if (wexc == null && (method == "POST" || method == "PUT")) {
1258                                 lock (locker) {
1259                                         CheckSendError (data);
1260                                         if (saved_exc != null)
1261                                                 wexc = (WebException) saved_exc;
1262                                 }
1263                         }
1264
1265                         WebAsyncResult r = asyncRead;
1266
1267                         bool forced = false;
1268                         if (r == null && webResponse != null) {
1269                                 // This is a forced completion (302, 204)...
1270                                 forced = true;
1271                                 r = new WebAsyncResult (null, null);
1272                                 r.SetCompleted (false, webResponse);
1273                         }
1274
1275                         if (r != null) {
1276                                 if (wexc != null) {
1277                                         r.SetCompleted (false, wexc);
1278                                         r.DoCallback ();
1279                                         return;
1280                                 }
1281
1282                                 bool redirected;
1283                                 try {
1284                                         redirected = CheckFinalStatus (r);
1285                                         if (!redirected) {
1286                                                 if (is_ntlm_auth && authCompleted && webResponse != null
1287                                                         && (int)webResponse.StatusCode < 400) {
1288                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1289                                                         if (wce != null) {
1290                                                                 WebConnection cnc = wce.Connection;
1291                                                                 cnc.NtlmAuthenticated = true;
1292                                                         }
1293                                                 }
1294
1295                                                 // clear internal buffer so that it does not
1296                                                 // hold possible big buffer (bug #397627)
1297                                                 if (writeStream != null)
1298                                                         writeStream.KillBuffer ();
1299
1300                                                 haveResponse = true;
1301                                                 r.SetCompleted (false, webResponse);
1302                                                 r.DoCallback ();
1303                                         } else {
1304                                                 if (webResponse != null) {
1305                                                         if (is_ntlm_auth) {
1306                                                                 HandleNtlmAuth (r);
1307                                                                 return;
1308                                                         }
1309                                                         webResponse.Close ();
1310                                                 }
1311                                                 haveResponse = false;
1312                                                 webResponse = null;
1313                                                 r.Reset ();
1314                                                 servicePoint = GetServicePoint ();
1315                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1316                                         }
1317                                 } catch (WebException wexc2) {
1318                                         if (forced) {
1319                                                 saved_exc = wexc2;
1320                                                 haveResponse = true;
1321                                         }
1322                                         r.SetCompleted (false, wexc2);
1323                                         r.DoCallback ();
1324                                         return;
1325                                 } catch (Exception ex) {
1326                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1327                                         if (forced) {
1328                                                 saved_exc = wexc;
1329                                                 haveResponse = true;
1330                                         }
1331                                         r.SetCompleted (false, wexc);
1332                                         r.DoCallback ();
1333                                         return;
1334                                 }
1335                         }
1336                         }
1337                 }
1338
1339                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1340                 {
1341                         authCompleted = false;
1342                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1343                                 return false;
1344
1345                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1346                         if (isProxy && (proxy == null || proxy.Credentials == null))
1347                                 return false;
1348
1349                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
1350                         if (authHeader == null)
1351                                 return false;
1352
1353                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1354                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1355                         if (auth == null)
1356                                 return false;
1357
1358                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1359                         authCompleted = auth.Complete;
1360                         is_ntlm_auth = (auth.Module.AuthenticationType == "NTLM");
1361                         return true;
1362                 }
1363
1364                 // Returns true if redirected
1365                 bool CheckFinalStatus (WebAsyncResult result)
1366                 {
1367                         if (result.GotException)
1368                                 throw result.Exception;
1369
1370                         Exception throwMe = result.Exception;
1371                         bodyBuffer = null;
1372
1373                         HttpWebResponse resp = result.Response;
1374                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1375                         HttpStatusCode code = 0;
1376                         if (throwMe == null && webResponse != null) {
1377                                 code = webResponse.StatusCode;
1378                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1379                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1380                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1381                                                 // Keep the written body, so it can be rewritten in the retry
1382                                                 if (InternalAllowBuffering) {
1383                                                         bodyBuffer = writeStream.WriteBuffer;
1384                                                         bodyBufferLength = writeStream.WriteBufferLength;
1385                                                         return true;
1386                                                 } else if (method != "PUT" && method != "POST") {
1387                                                         return true;
1388                                                 }
1389
1390                                                 writeStream.InternalClose ();
1391                                                 writeStream = null;
1392                                                 webResponse.Close ();
1393                                                 webResponse = null;
1394
1395                                                 throw new WebException ("This request requires buffering " +
1396                                                                         "of data for authentication or " +
1397                                                                         "redirection to be sucessful.");
1398                                         }
1399                                 }
1400
1401                                 if ((int) code >= 400) {
1402                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1403                                                                     (int) code, webResponse.StatusDescription);
1404                                         throwMe = new WebException (err, null, protoError, webResponse);
1405                                         webResponse.ReadAll ();
1406                                 } else if ((int) code == 304 && allowAutoRedirect) {
1407                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1408                                                                     (int) code, webResponse.StatusDescription);
1409                                         throwMe = new WebException (err, null, protoError, webResponse);
1410                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1411                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1412                                                                     protoError, webResponse);
1413                                         webResponse.ReadAll ();
1414                                 }
1415                         }
1416
1417                         if (throwMe == null) {
1418                                 bool b = false;
1419                                 int c = (int) code;
1420                                 if (allowAutoRedirect && c >= 300) {
1421                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1422                                                 bodyBuffer = writeStream.WriteBuffer;
1423                                                 bodyBufferLength = writeStream.WriteBufferLength;
1424                                         }
1425                                         b = Redirect (result, code);
1426                                 }
1427
1428                                 if (resp != null && c >= 300 && c != 304)
1429                                         resp.ReadAll ();
1430
1431                                 return b;
1432                         }
1433
1434                         if (writeStream != null) {
1435                                 writeStream.InternalClose ();
1436                                 writeStream = null;
1437                         }
1438
1439                         webResponse = null;
1440
1441                         throw throwMe;
1442                 }
1443         }
1444 }
1445