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