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

   1 //
   2 // System.Net.HttpWebRequest
   3 //
   4 // Authors:
   5 //      Lawrence Pit (loz@cable.a2000.nl)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8 // (c) 2002 Lawrence Pit
   9 // (c) 2003 Ximian, Inc. (http://www.ximian.com)
  10 // (c) 2004 Novell, Inc. (http://www.novell.com)
  11 //
  12
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System;
  35 using System.Collections;
  36 using System.Configuration;
  37 using System.IO;
  38 using System.Net.Sockets;
  39 using System.Runtime.Remoting.Messaging;
  40 using System.Runtime.Serialization;
  41 using System.Security.Cryptography.X509Certificates;
  42 using System.Text;
  43 using System.Threading;
  44
  45 #if NET_2_0
  46 using System.Net.Cache;
  47 #endif
  48
  49 namespace System.Net
  50 {
  51         [Serializable]
  52         public class HttpWebRequest : WebRequest, ISerializable
  53         {
  54                 Uri requestUri;
  55                 Uri actualUri;
  56                 bool hostChanged;
  57                 bool allowAutoRedirect = true;
  58                 bool allowBuffering = true;
  59                 X509CertificateCollection certificates;
  60                 string connectionGroup;
  61                 long contentLength = -1;
  62                 HttpContinueDelegate continueDelegate;
  63                 CookieContainer cookieContainer;
  64                 ICredentials credentials;
  65                 bool haveResponse;
  66                 bool haveRequest;
  67                 bool requestSent;
  68                 WebHeaderCollection webHeaders = new WebHeaderCollection (true);
  69                 bool keepAlive = true;
  70                 int maxAutoRedirect = 50;
  71                 string mediaType = String.Empty;
  72                 string method = "GET";
  73                 string initialMethod = "GET";
  74                 bool pipelined = true;
  75                 bool preAuthenticate;
  76                 bool usedPreAuth;
  77                 Version version = HttpVersion.Version11;
  78                 Version actualVersion;
  79                 IWebProxy proxy;
  80                 bool sendChunked;
  81                 ServicePoint servicePoint;
  82                 int timeout = 100000;
  83
  84                 WebConnectionStream writeStream;
  85                 HttpWebResponse webResponse;
  86                 WebAsyncResult asyncWrite;
  87                 WebAsyncResult asyncRead;
  88                 EventHandler abortHandler;
  89                 bool aborted;
  90                 bool gotRequestStream;
  91                 int redirects;
  92                 bool expectContinue;
  93                 bool authCompleted;
  94                 byte[] bodyBuffer;
  95                 int bodyBufferLength;
  96                 bool getResponseCalled;
  97                 Exception saved_exc;
  98                 object locker = new object ();
  99                 bool is_ntlm_auth;
 100 #if NET_1_1
 101                 int maxResponseHeadersLength;
 102                 static int defaultMaxResponseHeadersLength;
 103                 int readWriteTimeout = 300000; // ms
 104
 105                 // Constructors
 106                 static HttpWebRequest ()
 107                 {
 108                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 109                         defaultMaxResponseHeadersLength = 64 * 1024;
 110                         if (config != null) {
 111                                 int x = config.MaxResponseHeadersLength;
 112                                 if (x != -1)
 113                                         x *= 64;
 114
 115                                 defaultMaxResponseHeadersLength = x;
 116                         }
 117                 }
 118 #endif
 119
 120 #if NET_2_1
 121                 public
 122 #else
 123                 internal
 124 #endif
 125                 HttpWebRequest (Uri uri)
 126                 {
 127                         this.requestUri = uri;
 128                         this.actualUri = uri;
 129                         this.proxy = GlobalProxySelection.Select;
 130                 }
 131
 132 #if NET_2_0
 133                 [Obsolete ("Serialization is obsoleted for this type", false)]
 134 #endif
 135                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 136                 {
 137                         SerializationInfo info = serializationInfo;
 138
 139                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 140                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 141                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 142                         allowBuffering = info.GetBoolean ("allowBuffering");
 143                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 144                         connectionGroup = info.GetString ("connectionGroup");
 145                         contentLength = info.GetInt64 ("contentLength");
 146                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 147                         keepAlive = info.GetBoolean ("keepAlive");
 148                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 149                         mediaType = info.GetString ("mediaType");
 150                         method = info.GetString ("method");
 151                         initialMethod = info.GetString ("initialMethod");
 152                         pipelined = info.GetBoolean ("pipelined");
 153                         version = (Version) info.GetValue ("version", typeof (Version));
 154                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 155                         sendChunked = info.GetBoolean ("sendChunked");
 156                         timeout = info.GetInt32 ("timeout");
 157                         redirects = info.GetInt32 ("redirects");
 158                 }
 159
 160                 // Properties
 161
 162                 internal bool UsesNtlmAuthentication {
 163                         get { return is_ntlm_auth; }
 164                 }
 165
 166                 public string Accept {
 167                         get { return webHeaders ["Accept"]; }
 168                         set {
 169                                 CheckRequestStarted ();
 170                                 webHeaders.RemoveAndAdd ("Accept", value);
 171                         }
 172                 }
 173
 174                 public Uri Address {
 175                         get { return actualUri; }
 176                 }
 177
 178                 public bool AllowAutoRedirect {
 179                         get { return allowAutoRedirect; }
 180                         set { this.allowAutoRedirect = value; }
 181                 }
 182
 183                 public bool AllowWriteStreamBuffering {
 184                         get { return allowBuffering; }
 185                         set { allowBuffering = value; }
 186                 }
 187
 188 #if NET_2_0
 189                 static Exception GetMustImplement ()
 190                 {
 191                         return new NotImplementedException ();
 192                 }
 193
 194                 [MonoTODO]
 195                 public DecompressionMethods AutomaticDecompression
 196                 {
 197                         get {
 198                                 throw GetMustImplement ();
 199                         }
 200                         set {
 201                                 throw GetMustImplement ();
 202                         }
 203                 }
 204 #endif
 205
 206                 internal bool InternalAllowBuffering {
 207                         get {
 208                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 209                                                         method != "MKCOL" && method != "CONNECT" &&
 210                                                         method != "DELETE" && method != "TRACE"));
 211                         }
 212                 }
 213
 214                 public X509CertificateCollection ClientCertificates {
 215                         get {
 216                                 if (certificates == null)
 217                                         certificates = new X509CertificateCollection ();
 218
 219                                 return certificates;
 220                         }
 221 #if NET_2_0
 222                         [MonoTODO]
 223                         set {
 224                                 throw GetMustImplement ();
 225                         }
 226 #endif
 227                 }
 228
 229                 public string Connection {
 230                         get { return webHeaders ["Connection"]; }
 231                         set {
 232                                 CheckRequestStarted ();
 233                                 string val = value;
 234                                 if (val != null)
 235                                         val = val.Trim ().ToLower ();
 236
 237                                 if (val == null || val.Length == 0) {
 238                                         webHeaders.RemoveInternal ("Connection");
 239                                         return;
 240                                 }
 241
 242                                 if (val == "keep-alive" || val == "close")
 243                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 244
 245                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 246                                         value = value + ", Keep-Alive";
 247
 248                                 webHeaders.RemoveAndAdd ("Connection", value);
 249                         }
 250                 }
 251
 252                 public override string ConnectionGroupName {
 253                         get { return connectionGroup; }
 254                         set { connectionGroup = value; }
 255                 }
 256
 257                 public override long ContentLength {
 258                         get { return contentLength; }
 259                         set {
 260                                 CheckRequestStarted ();
 261                                 if (value < 0)
 262                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 263
 264                                 contentLength = value;
 265                         }
 266                 }
 267
 268                 internal long InternalContentLength {
 269                         set { contentLength = value; }
 270                 }
 271
 272                 public override string ContentType {
 273                         get { return webHeaders ["Content-Type"]; }
 274                         set {
 275                                 if (value == null || value.Trim().Length == 0) {
 276                                         webHeaders.RemoveInternal ("Content-Type");
 277                                         return;
 278                                 }
 279                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 280                         }
 281                 }
 282
 283                 public HttpContinueDelegate ContinueDelegate {
 284                         get { return continueDelegate; }
 285                         set { continueDelegate = value; }
 286                 }
 287
 288                 public CookieContainer CookieContainer {
 289                         get { return cookieContainer; }
 290                         set { cookieContainer = value; }
 291                 }
 292
 293                 public override ICredentials Credentials {
 294                         get { return credentials; }
 295                         set { credentials = value; }
 296                 }
 297
 298 #if NET_2_0
 299                 [MonoTODO]
 300                 public static new RequestCachePolicy DefaultCachePolicy
 301                 {
 302                         get {
 303                                 throw GetMustImplement ();
 304                         }
 305                         set {
 306                                 throw GetMustImplement ();
 307                         }
 308                 }
 309
 310                 [MonoTODO]
 311                 public static int DefaultMaximumErrorResponseLength
 312                 {
 313                         get {
 314                                 throw GetMustImplement ();
 315                         }
 316                         set {
 317                                 throw GetMustImplement ();
 318                         }
 319                 }
 320 #endif
 321
 322                 public string Expect {
 323                         get { return webHeaders ["Expect"]; }
 324                         set {
 325                                 CheckRequestStarted ();
 326                                 string val = value;
 327                                 if (val != null)
 328                                         val = val.Trim ().ToLower ();
 329
 330                                 if (val == null || val.Length == 0) {
 331                                         webHeaders.RemoveInternal ("Expect");
 332                                         return;
 333                                 }
 334
 335                                 if (val == "100-continue")
 336                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 337                                                                      "value");
 338                                 webHeaders.RemoveAndAdd ("Expect", value);
 339                         }
 340                 }
 341
 342                 public bool HaveResponse {
 343                         get { return haveResponse; }
 344                 }
 345
 346                 public override WebHeaderCollection Headers {
 347                         get { return webHeaders; }
 348                         set {
 349                                 CheckRequestStarted ();
 350                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 351                                 int count = value.Count;
 352                                 for (int i = 0; i < count; i++)
 353                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 354
 355                                 webHeaders = newHeaders;
 356                         }
 357                 }
 358
 359                 public DateTime IfModifiedSince {
 360                         get {
 361                                 string str = webHeaders ["If-Modified-Since"];
 362                                 if (str == null)
 363                                         return DateTime.Now;
 364                                 try {
 365                                         return MonoHttpDate.Parse (str);
 366                                 } catch (Exception) {
 367                                         return DateTime.Now;
 368                                 }
 369                         }
 370                         set {
 371                                 CheckRequestStarted ();
 372                                 // rfc-1123 pattern
 373                                 webHeaders.SetInternal ("If-Modified-Since",
 374                                         value.ToUniversalTime ().ToString ("r", null));
 375                                 // TODO: check last param when using different locale
 376                         }
 377                 }
 378
 379                 public bool KeepAlive {
 380                         get {
 381                                 return keepAlive;
 382                         }
 383                         set {
 384                                 keepAlive = value;
 385                         }
 386                 }
 387
 388                 public int MaximumAutomaticRedirections {
 389                         get { return maxAutoRedirect; }
 390                         set {
 391                                 if (value <= 0)
 392                                         throw new ArgumentException ("Must be > 0", "value");
 393
 394                                 maxAutoRedirect = value;
 395                         }
 396                 }
 397
 398 #if NET_1_1
 399                 [MonoTODO ("Use this")]
 400                 public int MaximumResponseHeadersLength {
 401                         get { return maxResponseHeadersLength; }
 402                         set { maxResponseHeadersLength = value; }
 403                 }
 404
 405                 [MonoTODO ("Use this")]
 406                 public static int DefaultMaximumResponseHeadersLength {
 407                         get { return defaultMaxResponseHeadersLength; }
 408                         set { defaultMaxResponseHeadersLength = value; }
 409                 }
 410
 411                 public
 412 #else
 413                 internal
 414 #endif
 415                 int ReadWriteTimeout {
 416                         get { return readWriteTimeout; }
 417                         set {
 418                                 if (requestSent)
 419                                         throw new InvalidOperationException ("The request has already been sent.");
 420
 421                                 if (value < -1)
 422                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 423
 424                                 readWriteTimeout = value;
 425                         }
 426                 }
 427
 428                 public string MediaType {
 429                         get { return mediaType; }
 430                         set {
 431                                 mediaType = value;
 432                         }
 433                 }
 434
 435                 public override string Method {
 436                         get { return this.method; }
 437                         set {
 438                                 if (value == null || value.Trim () == "")
 439                                         throw new ArgumentException ("not a valid method");
 440
 441                                 method = value;
 442                         }
 443                 }
 444
 445                 public bool Pipelined {
 446                         get { return pipelined; }
 447                         set { pipelined = value; }
 448                 }
 449
 450                 public override bool PreAuthenticate {
 451                         get { return preAuthenticate; }
 452                         set { preAuthenticate = value; }
 453                 }
 454
 455                 public Version ProtocolVersion {
 456                         get { return version; }
 457                         set {
 458                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 459                                         throw new ArgumentException ("value");
 460
 461                                 version = value;
 462                         }
 463                 }
 464
 465                 public override IWebProxy Proxy {
 466                         get { return proxy; }
 467                         set {
 468                                 CheckRequestStarted ();
 469 #if ONLY_1_1
 470                                 if (value == null)
 471                                         throw new ArgumentNullException ("value");
 472 #endif
 473
 474                                 proxy = value;
 475                                 servicePoint = null; // we may need a new one
 476                         }
 477                 }
 478
 479                 public string Referer {
 480                         get { return webHeaders ["Referer"]; }
 481                         set {
 482                                 CheckRequestStarted ();
 483                                 if (value == null || value.Trim().Length == 0) {
 484                                         webHeaders.RemoveInternal ("Referer");
 485                                         return;
 486                                 }
 487                                 webHeaders.SetInternal ("Referer", value);
 488                         }
 489                 }
 490
 491                 public override Uri RequestUri {
 492                         get { return requestUri; }
 493                 }
 494
 495                 public bool SendChunked {
 496                         get { return sendChunked; }
 497                         set {
 498                                 CheckRequestStarted ();
 499                                 sendChunked = value;
 500                         }
 501                 }
 502
 503                 public ServicePoint ServicePoint {
 504                         get { return GetServicePoint (); }
 505                 }
 506
 507                 public override int Timeout {
 508                         get { return timeout; }
 509                         set {
 510                                 if (value < -1)
 511                                         throw new ArgumentOutOfRangeException ("value");
 512
 513                                 timeout = value;
 514                         }
 515                 }
 516
 517                 public string TransferEncoding {
 518                         get { return webHeaders ["Transfer-Encoding"]; }
 519                         set {
 520                                 CheckRequestStarted ();
 521                                 string val = value;
 522                                 if (val != null)
 523                                         val = val.Trim ().ToLower ();
 524
 525                                 if (val == null || val.Length == 0) {
 526                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 527                                         return;
 528                                 }
 529
 530                                 if (val == "chunked")
 531                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 532
 533                                 if (!sendChunked)
 534                                         throw new ArgumentException ("SendChunked must be True", "value");
 535
 536                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 537                         }
 538                 }
 539
 540 #if NET_2_0
 541                 [MonoTODO]
 542                 public override bool UseDefaultCredentials
 543                 {
 544                         get {
 545                                 throw GetMustImplement ();
 546                         }
 547                         set {
 548                                 throw GetMustImplement ();
 549                         }
 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                 void CommonChecks (bool putpost)
 645                 {
 646                         if (method == null)
 647                                 throw new ProtocolViolationException ("Method is null.");
 648
 649                         if (putpost && ((!keepAlive || (contentLength == -1 && !sendChunked)) && !allowBuffering))
 650                                 throw new ProtocolViolationException ("Content-Length not set");
 651
 652                         string transferEncoding = TransferEncoding;
 653                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 654                                 throw new ProtocolViolationException ("SendChunked should be true.");
 655                 }
 656
 657                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 658                 {
 659                         if (aborted)
 660                                 throw new WebException ("The request was previosly aborted.");
 661
 662                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 663                                         method == "TRACE" || method == "DELETE");
 664                         if (method == null || !send)
 665                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 666
 667                         CommonChecks (send);
 668
 669                         lock (locker)
 670                         {
 671                                 if (asyncWrite != null) {
 672                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 673                                                                 "method while a previous call is still in progress.");
 674                                 }
 675
 676                                 asyncWrite = new WebAsyncResult (this, callback, state);
 677                                 initialMethod = method;
 678                                 if (haveRequest) {
 679                                         if (writeStream != null) {
 680                                                 asyncWrite.SetCompleted (true, writeStream);
 681                                                 asyncWrite.DoCallback ();
 682                                                 return asyncWrite;
 683                                         }
 684                                 }
 685
 686                                 gotRequestStream = true;
 687                                 WebAsyncResult result = asyncWrite;
 688                                 if (!requestSent) {
 689                                         requestSent = true;
 690                                         redirects = 0;
 691                                         servicePoint = GetServicePoint ();
 692                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 693                                 }
 694                                 return result;
 695                         }
 696                 }
 697
 698                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 699                 {
 700                         if (asyncResult == null)
 701                                 throw new ArgumentNullException ("asyncResult");
 702
 703                         WebAsyncResult result = asyncResult as WebAsyncResult;
 704                         if (result == null)
 705                                 throw new ArgumentException ("Invalid IAsyncResult");
 706
 707                         asyncWrite = result;
 708                         result.WaitUntilComplete ();
 709
 710                         Exception e = result.Exception;
 711                         if (e != null)
 712                                 throw e;
 713
 714                         return result.WriteStream;
 715                 }
 716
 717                 public override Stream GetRequestStream()
 718                 {
 719                         IAsyncResult asyncResult = asyncWrite;
 720                         if (asyncResult == null) {
 721                                 asyncResult = BeginGetRequestStream (null, null);
 722                                 asyncWrite = (WebAsyncResult) asyncResult;
 723                         }
 724
 725                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 726                                 Abort ();
 727                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 728                         }
 729
 730                         return EndGetRequestStream (asyncResult);
 731                 }
 732
 733                 void CheckIfForceWrite ()
 734                 {
 735                         if (writeStream == null || contentLength < 0 || !InternalAllowBuffering)
 736                                 return;
 737
 738                         // This will write the POST/PUT if the write stream already has the expected
 739                         // amount of bytes in it (ContentLength) (bug #77753).
 740                         if (writeStream.WriteBufferLength == contentLength)
 741                                 writeStream.WriteRequest ();
 742                 }
 743
 744                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 745                 {
 746                         bool send = (method == "PUT" || method == "POST");
 747                         if (send) {
 748                                 if ((!KeepAlive || (ContentLength == -1 && !SendChunked)) && !AllowWriteStreamBuffering)
 749                                         throw new ProtocolViolationException ("Content-Length not set");
 750                         }
 751
 752                         CommonChecks (send);
 753                         Monitor.Enter (this);
 754                         getResponseCalled = true;
 755                         if (asyncRead != null && !haveResponse) {
 756                                 Monitor.Exit (this);
 757                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 758                                                         "method while a previous call is still in progress.");
 759                         }
 760
 761                         CheckIfForceWrite ();
 762                         asyncRead = new WebAsyncResult (this, callback, state);
 763                         WebAsyncResult aread = asyncRead;
 764                         initialMethod = method;
 765                         if (haveResponse) {
 766                                 if (webResponse != null) {
 767                                         Exception saved = saved_exc;
 768                                         Monitor.Exit (this);
 769                                         if (saved == null) {
 770                                                 aread.SetCompleted (true, webResponse);
 771                                         } else {
 772                                                 aread.SetCompleted (true, saved);
 773                                         }
 774                                         aread.DoCallback ();
 775                                         return aread;
 776                                 }
 777                         }
 778
 779                         if (!requestSent) {
 780                                 requestSent = true;
 781                                 redirects = 0;
 782                                 servicePoint = GetServicePoint ();
 783                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 784                         }
 785
 786                         Monitor.Exit (this);
 787                         return aread;
 788                 }
 789
 790                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 791                 {
 792                         if (asyncResult == null)
 793                                 throw new ArgumentNullException ("asyncResult");
 794
 795                         WebAsyncResult result = asyncResult as WebAsyncResult;
 796                         if (result == null)
 797                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 798
 799                         if (!result.WaitUntilComplete (timeout, false)) {
 800                                 Abort ();
 801                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 802                         }
 803
 804                         if (result.GotException)
 805                                 throw result.Exception;
 806
 807                         return result.Response;
 808                 }
 809
 810                 public override WebResponse GetResponse()
 811                 {
 812                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 813                         return EndGetResponse (result);
 814                 }
 815
 816                 public override void Abort ()
 817                 {
 818                         haveResponse = true;
 819                         aborted = true;
 820                         if (asyncWrite != null) {
 821                                 WebAsyncResult r = asyncWrite;
 822                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 823                                 r.SetCompleted (false, wexc);
 824                                 r.DoCallback ();
 825                                 asyncWrite = null;
 826                         }
 827
 828                         if (asyncRead != null) {
 829                                 WebAsyncResult r = asyncRead;
 830                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 831                                 r.SetCompleted (false, wexc);
 832                                 r.DoCallback ();
 833                                 asyncRead = null;
 834                         }
 835
 836                         if (abortHandler != null) {
 837                                 try {
 838                                         abortHandler (this, EventArgs.Empty);
 839                                 } catch (Exception) {}
 840                                 abortHandler = null;
 841                         }
 842
 843                         if (writeStream != null) {
 844                                 try {
 845                                         writeStream.Close ();
 846                                         writeStream = null;
 847                                 } catch {}
 848                         }
 849
 850                         if (webResponse != null) {
 851                                 try {
 852                                         webResponse.Close ();
 853                                         webResponse = null;
 854                                 } catch {}
 855                         }
 856                 }
 857
 858                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 859                                                   StreamingContext streamingContext)
 860                 {
 861                         GetObjectData (serializationInfo, streamingContext);
 862                 }
 863
 864 #if NET_2_0
 865                 protected override
 866 #endif
 867                 void GetObjectData (SerializationInfo serializationInfo,
 868                                     StreamingContext streamingContext)
 869                 {
 870                         SerializationInfo info = serializationInfo;
 871
 872                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 873                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 874                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 875                         info.AddValue ("allowBuffering", allowBuffering);
 876                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 877                         info.AddValue ("connectionGroup", connectionGroup);
 878                         info.AddValue ("contentLength", contentLength);
 879                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 880                         info.AddValue ("keepAlive", keepAlive);
 881                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 882                         info.AddValue ("mediaType", mediaType);
 883                         info.AddValue ("method", method);
 884                         info.AddValue ("initialMethod", initialMethod);
 885                         info.AddValue ("pipelined", pipelined);
 886                         info.AddValue ("version", version, typeof (Version));
 887                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 888                         info.AddValue ("sendChunked", sendChunked);
 889                         info.AddValue ("timeout", timeout);
 890                         info.AddValue ("redirects", redirects);
 891                 }
 892
 893                 void CheckRequestStarted ()
 894                 {
 895                         if (requestSent)
 896                                 throw new InvalidOperationException ("request started");
 897                 }
 898
 899                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 900                 {
 901                         if (continueDelegate != null)
 902                                 continueDelegate (statusCode, headers);
 903                 }
 904
 905                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 906                 {
 907                         redirects++;
 908                         Exception e = null;
 909                         string uriString = null;
 910
 911                         switch (code) {
 912                         case HttpStatusCode.Ambiguous: // 300
 913                                 e = new WebException ("Ambiguous redirect.");
 914                                 break;
 915                         case HttpStatusCode.MovedPermanently: // 301
 916                         case HttpStatusCode.Redirect: // 302
 917                         case HttpStatusCode.TemporaryRedirect: // 307
 918                                 /* MS follows the redirect for POST too
 919                                 if (method != "GET" && method != "HEAD") // 10.3
 920                                         return false;
 921                                 */
 922
 923                                 contentLength = 0;
 924                                 bodyBufferLength = 0;
 925                                 bodyBuffer = null;
 926                                 method = "GET";
 927                                 uriString = webResponse.Headers ["Location"];
 928                                 break;
 929                         case HttpStatusCode.SeeOther: //303
 930                                 method = "GET";
 931                                 uriString = webResponse.Headers ["Location"];
 932                                 break;
 933                         case HttpStatusCode.NotModified: // 304
 934                                 return false;
 935                         case HttpStatusCode.UseProxy: // 305
 936                                 e = new NotImplementedException ("Proxy support not available.");
 937                                 break;
 938                         case HttpStatusCode.Unused: // 306
 939                         default:
 940                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 941                                 break;
 942                         }
 943
 944                         if (e != null)
 945                                 throw e;
 946
 947                         if (uriString == null)
 948                                 throw new WebException ("No Location header found for " + (int) code,
 949                                                         WebExceptionStatus.ProtocolError);
 950
 951                         Uri prev = actualUri;
 952                         try {
 953                                 actualUri = new Uri (actualUri, uriString);
 954                         } catch (Exception) {
 955                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 956                                                                         uriString, (int) code),
 957                                                                         WebExceptionStatus.ProtocolError);
 958                         }
 959
 960                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 961                                         actualUri.Port != prev.Port);
 962                         return true;
 963                 }
 964
 965                 string GetHeaders ()
 966                 {
 967                         bool continue100 = false;
 968                         if (contentLength != -1) {
 969                                 if (contentLength > 0)
 970                                         continue100 = true;
 971                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 972                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 973                         } else if (sendChunked) {
 974                                 continue100 = true;
 975                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
 976                                 webHeaders.RemoveInternal ("Content-Length");
 977                         }
 978
 979                         if (actualVersion == HttpVersion.Version11 && continue100 &&
 980                             servicePoint.SendContinue) { // RFC2616 8.2.3
 981                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
 982                                 expectContinue = true;
 983                         } else {
 984                                 webHeaders.RemoveInternal ("Expect");
 985                                 expectContinue = false;
 986                         }
 987
 988                         bool proxy_query = ProxyQuery;
 989                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
 990                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
 991                         Version proto_version = servicePoint.ProtocolVersion;
 992                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
 993
 994                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
 995                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
 996                         } else if (!keepAlive && version == HttpVersion.Version11) {
 997                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
 998                         }
 999
1000                         webHeaders.SetInternal ("Host", actualUri.Authority);
1001                         if (cookieContainer != null) {
1002                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
1003                                 if (cookieHeader != "")
1004                                         webHeaders.SetInternal ("Cookie", cookieHeader);
1005                         }
1006
1007                         if (!usedPreAuth && preAuthenticate)
1008                                 DoPreAuthenticate ();
1009
1010                         return webHeaders.ToString ();
1011                 }
1012
1013                 void DoPreAuthenticate ()
1014                 {
1015                         webHeaders.RemoveInternal ("Proxy-Authorization");
1016                         webHeaders.RemoveInternal ("Authorization");
1017                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1018                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1019                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1020                         if (auth == null)
1021                                 return;
1022
1023                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1024                         webHeaders [authHeader] = auth.Message;
1025                         usedPreAuth = true;
1026                 }
1027
1028                 internal void SetWriteStreamError (WebExceptionStatus status)
1029                 {
1030                         if (aborted)
1031                                 return;
1032
1033                         WebAsyncResult r = asyncWrite;
1034                         if (r == null)
1035                                 r = asyncRead;
1036
1037                         if (r != null) {
1038                                 r.SetCompleted (false, new WebException ("Error: " + status, status));
1039                                 r.DoCallback ();
1040                         }
1041                 }
1042
1043                 internal void SendRequestHeaders ()
1044                 {
1045                         StringBuilder req = new StringBuilder ();
1046                         string query;
1047                         if (!ProxyQuery) {
1048                                 query = actualUri.PathAndQuery;
1049                         } else if (actualUri.IsDefaultPort) {
1050                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1051                                                                         actualUri.Host,
1052                                                                         actualUri.PathAndQuery);
1053                         } else {
1054                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
1055                                                                            actualUri.Host,
1056                                                                            actualUri.Port,
1057                                                                            actualUri.PathAndQuery);
1058                         }
1059
1060                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1061                                 actualVersion = servicePoint.ProtocolVersion;
1062                         } else {
1063                                 actualVersion = version;
1064                         }
1065
1066                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1067                                                                 actualVersion.Major, actualVersion.Minor);
1068                         req.Append (GetHeaders ());
1069                         string reqstr = req.ToString ();
1070                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
1071                         try {
1072                                 writeStream.SetHeaders (bytes, 0, bytes.Length);
1073                         } catch (WebException wexc) {
1074                                 SetWriteStreamError (wexc.Status);
1075                         } catch (Exception) {
1076                                 SetWriteStreamError (WebExceptionStatus.SendFailure);
1077                         }
1078                 }
1079
1080                 internal void SetWriteStream (WebConnectionStream stream)
1081                 {
1082                         if (aborted)
1083                                 return;
1084
1085                         writeStream = stream;
1086                         if (bodyBuffer != null) {
1087                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1088                                 contentLength = bodyBufferLength;
1089                                 writeStream.SendChunked = false;
1090                         }
1091
1092                         SendRequestHeaders ();
1093
1094                         haveRequest = true;
1095
1096                         if (bodyBuffer != null) {
1097                                 // The body has been written and buffered. The request "user"
1098                                 // won't write it again, so we must do it.
1099                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1100                                 bodyBuffer = null;
1101                                 writeStream.Close ();
1102                         } else if (method == "PUT" || method == "POST" || method == "OPTIONS") {
1103                                 if (getResponseCalled && !writeStream.RequestWritten)
1104                                         writeStream.WriteRequest ();
1105                         }
1106
1107                         if (asyncWrite != null) {
1108                                 asyncWrite.SetCompleted (false, stream);
1109                                 asyncWrite.DoCallback ();
1110                                 asyncWrite = null;
1111                         }
1112                 }
1113
1114                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1115                 {
1116                         if (aborted)
1117                                 return;
1118                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1119                         WebAsyncResult r = asyncRead;
1120                         if (r == null)
1121                                 r = asyncWrite;
1122
1123                         if (r != null) {
1124                                 WebException wexc;
1125                                 if (e is WebException) {
1126                                         wexc = (WebException) e;
1127                                 } else {
1128                                         wexc = new WebException (msg, e, status, null);
1129                                 }
1130                                 r.SetCompleted (false, wexc);
1131                                 r.DoCallback ();
1132                                 asyncRead = null;
1133                                 asyncWrite = null;
1134                         }
1135                 }
1136
1137                 void CheckSendError (WebConnectionData data)
1138                 {
1139                         // Got here, but no one called GetResponse
1140                         int status = data.StatusCode;
1141                         if (status < 400 || status == 401 || status == 407)
1142                                 return;
1143
1144                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1145                                 // The request has not been completely sent and we got here!
1146                                 // We should probably just close and cause an error in any case,
1147                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1148                                 webResponse.ReadAll ();
1149                         }
1150                 }
1151
1152                 void HandleNtlmAuth (WebAsyncResult r)
1153                 {
1154                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1155                         if (wce != null) {
1156                                 WebConnection cnc = wce.Connection;
1157                                 cnc.PriorityRequest = this;
1158                                 bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1159                                 ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1160                                 if (creds != null) {
1161                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1162 #if NET_1_1
1163                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1164 #endif
1165                                 }
1166                         }
1167                         r.Reset ();
1168                         haveResponse = false;
1169                         webResponse.ReadAll ();
1170                         webResponse = null;
1171                 }
1172
1173                 internal void SetResponseData (WebConnectionData data)
1174                 {
1175                         if (aborted) {
1176                                 if (data.stream != null)
1177                                         data.stream.Close ();
1178                                 return;
1179                         }
1180
1181                         WebException wexc = null;
1182                         try {
1183                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1184                                 haveResponse = true;
1185                         } catch (Exception e) {
1186                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1187                                 if (data.stream != null)
1188                                         data.stream.Close ();
1189                         }
1190
1191                         if (wexc == null && (method == "POST" || method == "PUT")) {
1192                                 lock (locker) {
1193                                         CheckSendError (data);
1194                                         if (saved_exc != null)
1195                                                 wexc = (WebException) saved_exc;
1196                                 }
1197                         }
1198
1199                         WebAsyncResult r = asyncRead;
1200                         if (r != null) {
1201                                 if (wexc != null) {
1202                                         r.SetCompleted (false, wexc);
1203                                         r.DoCallback ();
1204                                         return;
1205                                 }
1206
1207                                 bool redirected;
1208                                 try {
1209                                         redirected = CheckFinalStatus (r);
1210                                         if (!redirected) {
1211                                                 if (is_ntlm_auth && authCompleted && webResponse != null
1212                                                         && (int)webResponse.StatusCode < 400) {
1213                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1214                                                         if (wce != null) {
1215                                                                 WebConnection cnc = wce.Connection;
1216                                                                 cnc.NtlmAuthenticated = true;
1217                                                         }
1218                                                 }
1219
1220                                                 // clear internal buffer so that it does not
1221                                                 // hold possible big buffer (bug #397627)
1222                                                 if (writeStream != null)
1223                                                         writeStream.KillBuffer ();
1224
1225                                                 r.SetCompleted (false, webResponse);
1226                                                 r.DoCallback ();
1227                                         } else {
1228                                                 if (webResponse != null) {
1229                                                         if (is_ntlm_auth) {
1230                                                                 HandleNtlmAuth (r);
1231                                                                 return;
1232                                                         }
1233                                                         webResponse.Close ();
1234                                                 }
1235                                                 haveResponse = false;
1236                                                 webResponse = null;
1237                                                 r.Reset ();
1238                                                 servicePoint = GetServicePoint ();
1239                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1240                                         }
1241                                 } catch (WebException wexc2) {
1242                                         r.SetCompleted (false, wexc2);
1243                                         r.DoCallback ();
1244                                         return;
1245                                 } catch (Exception ex) {
1246                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1247                                         r.SetCompleted (false, wexc);
1248                                         r.DoCallback ();
1249                                         return;
1250                                 }
1251                         }
1252                 }
1253
1254                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1255                 {
1256                         authCompleted = false;
1257                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1258                                 return false;
1259
1260                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1261                         if (isProxy && (proxy == null || proxy.Credentials == null))
1262                                 return false;
1263
1264                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
1265                         if (authHeader == null)
1266                                 return false;
1267
1268                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1269                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1270                         if (auth == null)
1271                                 return false;
1272
1273                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1274                         authCompleted = auth.Complete;
1275                         is_ntlm_auth = (auth.Module.AuthenticationType == "NTLM");
1276                         return true;
1277                 }
1278
1279                 // Returns true if redirected
1280                 bool CheckFinalStatus (WebAsyncResult result)
1281                 {
1282                         if (result.GotException)
1283                                 throw result.Exception;
1284
1285                         Exception throwMe = result.Exception;
1286                         bodyBuffer = null;
1287
1288                         HttpWebResponse resp = result.Response;
1289                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1290                         HttpStatusCode code = 0;
1291                         if (throwMe == null && webResponse != null) {
1292                                 code = webResponse.StatusCode;
1293                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1294                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1295                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1296                                                 // Keep the written body, so it can be rewritten in the retry
1297                                                 if (InternalAllowBuffering) {
1298                                                         bodyBuffer = writeStream.WriteBuffer;
1299                                                         bodyBufferLength = writeStream.WriteBufferLength;
1300                                                         return true;
1301                                                 } else if (method != "PUT" && method != "POST") {
1302                                                         return true;
1303                                                 }
1304
1305                                                 writeStream.InternalClose ();
1306                                                 writeStream = null;
1307                                                 webResponse.Close ();
1308                                                 webResponse = null;
1309
1310                                                 throw new WebException ("This request requires buffering " +
1311                                                                         "of data for authentication or " +
1312                                                                         "redirection to be sucessful.");
1313                                         }
1314                                 }
1315
1316                                 if ((int) code >= 400) {
1317                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1318                                                                     (int) code, webResponse.StatusDescription);
1319                                         throwMe = new WebException (err, null, protoError, webResponse);
1320                                         webResponse.ReadAll ();
1321                                 } else if ((int) code == 304 && allowAutoRedirect) {
1322                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1323                                                                     (int) code, webResponse.StatusDescription);
1324                                         throwMe = new WebException (err, null, protoError, webResponse);
1325                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1326                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1327                                                                     protoError, webResponse);
1328                                         webResponse.ReadAll ();
1329                                 }
1330                         }
1331
1332                         if (throwMe == null) {
1333                                 bool b = false;
1334                                 int c = (int) code;
1335                                 if (allowAutoRedirect && c >= 300) {
1336                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1337                                                 bodyBuffer = writeStream.WriteBuffer;
1338                                                 bodyBufferLength = writeStream.WriteBufferLength;
1339                                         }
1340                                         b = Redirect (result, code);
1341                                 }
1342
1343                                 if (resp != null && c >= 300 && c != 304)
1344                                         resp.ReadAll ();
1345
1346                                 return b;
1347                         }
1348
1349                         if (writeStream != null) {
1350                                 writeStream.InternalClose ();
1351                                 writeStream = null;
1352                         }
1353
1354                         webResponse = null;
1355
1356                         throw throwMe;
1357                 }
1358         }
1359 }
1360