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                 bool getResponseCalled;
  93                 Exception saved_exc;
  94                 object locker = new object ();
  95 #if NET_1_1
  96                 int maxResponseHeadersLength;
  97                 static int defaultMaxResponseHeadersLength;
  98                 int readWriteTimeout = 300000; // ms
  99
 100                 // Constructors
 101                 static HttpWebRequest ()
 102                 {
 103                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 104                         defaultMaxResponseHeadersLength = 64 * 1024;
 105                         if (config != null) {
 106                                 int x = config.MaxResponseHeadersLength;
 107                                 if (x != -1)
 108                                         x *= 64;
 109
 110                                 defaultMaxResponseHeadersLength = x;
 111                         }
 112                 }
 113 #endif
 114
 115                 internal HttpWebRequest (Uri uri)
 116                 {
 117                         this.requestUri = uri;
 118                         this.actualUri = uri;
 119                         this.proxy = GlobalProxySelection.Select;
 120                 }
 121
 122                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 123                 {
 124                         SerializationInfo info = serializationInfo;
 125
 126                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 127                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 128                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 129                         allowBuffering = info.GetBoolean ("allowBuffering");
 130                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 131                         connectionGroup = info.GetString ("connectionGroup");
 132                         contentLength = info.GetInt64 ("contentLength");
 133                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 134                         keepAlive = info.GetBoolean ("keepAlive");
 135                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 136                         mediaType = info.GetString ("mediaType");
 137                         method = info.GetString ("method");
 138                         initialMethod = info.GetString ("initialMethod");
 139                         pipelined = info.GetBoolean ("pipelined");
 140                         version = (Version) info.GetValue ("version", typeof (Version));
 141                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 142                         sendChunked = info.GetBoolean ("sendChunked");
 143                         timeout = info.GetInt32 ("timeout");
 144                         redirects = info.GetInt32 ("redirects");
 145                 }
 146
 147                 // Properties
 148
 149                 public string Accept {
 150                         get { return webHeaders ["Accept"]; }
 151                         set {
 152                                 CheckRequestStarted ();
 153                                 webHeaders.RemoveAndAdd ("Accept", value);
 154                         }
 155                 }
 156
 157                 public Uri Address {
 158                         get { return actualUri; }
 159                 }
 160
 161                 public bool AllowAutoRedirect {
 162                         get { return allowAutoRedirect; }
 163                         set { this.allowAutoRedirect = value; }
 164                 }
 165
 166                 public bool AllowWriteStreamBuffering {
 167                         get { return allowBuffering; }
 168                         set { allowBuffering = value; }
 169                 }
 170
 171                 internal bool InternalAllowBuffering {
 172                         get {
 173                                 return (allowBuffering && (method == "PUT" || method == "POST"));
 174                         }
 175                 }
 176
 177                 public X509CertificateCollection ClientCertificates {
 178                         get {
 179                                 if (certificates == null)
 180                                         certificates = new X509CertificateCollection ();
 181
 182                                 return certificates;
 183                         }
 184                 }
 185
 186                 public string Connection {
 187                         get { return webHeaders ["Connection"]; }
 188                         set {
 189                                 CheckRequestStarted ();
 190                                 string val = value;
 191                                 if (val != null)
 192                                         val = val.Trim ().ToLower ();
 193
 194                                 if (val == null || val.Length == 0) {
 195                                         webHeaders.RemoveInternal ("Connection");
 196                                         return;
 197                                 }
 198
 199                                 if (val == "keep-alive" || val == "close")
 200                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 201
 202                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 203                                         value = value + ", Keep-Alive";
 204
 205                                 webHeaders.RemoveAndAdd ("Connection", value);
 206                         }
 207                 }
 208
 209                 public override string ConnectionGroupName {
 210                         get { return connectionGroup; }
 211                         set { connectionGroup = value; }
 212                 }
 213
 214                 public override long ContentLength {
 215                         get { return contentLength; }
 216                         set {
 217                                 CheckRequestStarted ();
 218                                 if (value < 0)
 219                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 220
 221                                 contentLength = value;
 222                         }
 223                 }
 224
 225                 internal long InternalContentLength {
 226                         set { contentLength = value; }
 227                 }
 228
 229                 public override string ContentType {
 230                         get { return webHeaders ["Content-Type"]; }
 231                         set {
 232                                 if (value == null || value.Trim().Length == 0) {
 233                                         webHeaders.RemoveInternal ("Content-Type");
 234                                         return;
 235                                 }
 236                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 237                         }
 238                 }
 239
 240                 public HttpContinueDelegate ContinueDelegate {
 241                         get { return continueDelegate; }
 242                         set { continueDelegate = value; }
 243                 }
 244
 245                 public CookieContainer CookieContainer {
 246                         get { return cookieContainer; }
 247                         set { cookieContainer = value; }
 248                 }
 249
 250                 public override ICredentials Credentials {
 251                         get { return credentials; }
 252                         set { credentials = value; }
 253                 }
 254
 255                 public string Expect {
 256                         get { return webHeaders ["Expect"]; }
 257                         set {
 258                                 CheckRequestStarted ();
 259                                 string val = value;
 260                                 if (val != null)
 261                                         val = val.Trim ().ToLower ();
 262
 263                                 if (val == null || val.Length == 0) {
 264                                         webHeaders.RemoveInternal ("Expect");
 265                                         return;
 266                                 }
 267
 268                                 if (val == "100-continue")
 269                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 270                                                                      "value");
 271                                 webHeaders.RemoveAndAdd ("Expect", value);
 272                         }
 273                 }
 274
 275                 public bool HaveResponse {
 276                         get { return haveResponse; }
 277                 }
 278
 279                 public override WebHeaderCollection Headers {
 280                         get { return webHeaders; }
 281                         set {
 282                                 CheckRequestStarted ();
 283                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 284                                 int count = value.Count;
 285                                 for (int i = 0; i < count; i++)
 286                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 287
 288                                 webHeaders = newHeaders;
 289                         }
 290                 }
 291
 292                 public DateTime IfModifiedSince {
 293                         get {
 294                                 string str = webHeaders ["If-Modified-Since"];
 295                                 if (str == null)
 296                                         return DateTime.Now;
 297                                 try {
 298                                         return MonoHttpDate.Parse (str);
 299                                 } catch (Exception) {
 300                                         return DateTime.Now;
 301                                 }
 302                         }
 303                         set {
 304                                 CheckRequestStarted ();
 305                                 // rfc-1123 pattern
 306                                 webHeaders.SetInternal ("If-Modified-Since",
 307                                         value.ToUniversalTime ().ToString ("r", null));
 308                                 // TODO: check last param when using different locale
 309                         }
 310                 }
 311
 312                 public bool KeepAlive {
 313                         get {
 314                                 return keepAlive;
 315                         }
 316                         set {
 317                                 keepAlive = value;
 318                         }
 319                 }
 320
 321                 public int MaximumAutomaticRedirections {
 322                         get { return maxAutoRedirect; }
 323                         set {
 324                                 if (value <= 0)
 325                                         throw new ArgumentException ("Must be > 0", "value");
 326
 327                                 maxAutoRedirect = value;
 328                         }
 329                 }
 330
 331 #if NET_1_1
 332                 [MonoTODO ("Use this")]
 333                 public int MaximumResponseHeadersLength {
 334                         get { return maxResponseHeadersLength; }
 335                         set { maxResponseHeadersLength = value; }
 336                 }
 337
 338                 [MonoTODO ("Use this")]
 339                 public static int DefaultMaximumResponseHeadersLength {
 340                         get { return defaultMaxResponseHeadersLength; }
 341                         set { defaultMaxResponseHeadersLength = value; }
 342                 }
 343
 344                 public
 345 #else
 346                 internal
 347 #endif
 348                 int ReadWriteTimeout {
 349                         get { return readWriteTimeout; }
 350                         set {
 351                                 if (requestSent)
 352                                         throw new InvalidOperationException ("The request has already been sent.");
 353
 354                                 if (value < -1)
 355                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 356
 357                                 readWriteTimeout = value;
 358                         }
 359                 }
 360
 361                 public string MediaType {
 362                         get { return mediaType; }
 363                         set {
 364                                 mediaType = value;
 365                         }
 366                 }
 367
 368                 public override string Method {
 369                         get { return this.method; }
 370                         set {
 371                                 if (value == null || value.Trim () == "")
 372                                         throw new ArgumentException ("not a valid method");
 373
 374                                 method = value;
 375                         }
 376                 }
 377
 378                 public bool Pipelined {
 379                         get { return pipelined; }
 380                         set { pipelined = value; }
 381                 }
 382
 383                 public override bool PreAuthenticate {
 384                         get { return preAuthenticate; }
 385                         set { preAuthenticate = value; }
 386                 }
 387
 388                 public Version ProtocolVersion {
 389                         get { return version; }
 390                         set {
 391                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 392                                         throw new ArgumentException ("value");
 393
 394                                 version = value;
 395                         }
 396                 }
 397
 398                 public override IWebProxy Proxy {
 399                         get { return proxy; }
 400                         set {
 401                                 CheckRequestStarted ();
 402                                 if (value == null)
 403                                         throw new ArgumentNullException ("value");
 404
 405                                 proxy = value;
 406                                 servicePoint = null; // we may need a new one
 407                         }
 408                 }
 409
 410                 public string Referer {
 411                         get { return webHeaders ["Referer"]; }
 412                         set {
 413                                 CheckRequestStarted ();
 414                                 if (value == null || value.Trim().Length == 0) {
 415                                         webHeaders.RemoveInternal ("Referer");
 416                                         return;
 417                                 }
 418                                 webHeaders.SetInternal ("Referer", value);
 419                         }
 420                 }
 421
 422                 public override Uri RequestUri {
 423                         get { return requestUri; }
 424                 }
 425
 426                 public bool SendChunked {
 427                         get { return sendChunked; }
 428                         set {
 429                                 CheckRequestStarted ();
 430                                 sendChunked = value;
 431                         }
 432                 }
 433
 434                 public ServicePoint ServicePoint {
 435                         get { return GetServicePoint (); }
 436                 }
 437
 438                 public override int Timeout {
 439                         get { return timeout; }
 440                         set {
 441                                 if (value < -1)
 442                                         throw new ArgumentOutOfRangeException ("value");
 443
 444                                 timeout = value;
 445                         }
 446                 }
 447
 448                 public string TransferEncoding {
 449                         get { return webHeaders ["Transfer-Encoding"]; }
 450                         set {
 451                                 CheckRequestStarted ();
 452                                 string val = value;
 453                                 if (val != null)
 454                                         val = val.Trim ().ToLower ();
 455
 456                                 if (val == null || val.Length == 0) {
 457                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 458                                         return;
 459                                 }
 460
 461                                 if (val == "chunked")
 462                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 463
 464                                 if (!sendChunked)
 465                                         throw new ArgumentException ("SendChunked must be True", "value");
 466
 467                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 468                         }
 469                 }
 470
 471                 public string UserAgent {
 472                         get { return webHeaders ["User-Agent"]; }
 473                         set { webHeaders.SetInternal ("User-Agent", value); }
 474                 }
 475
 476 #if NET_1_1
 477                 bool unsafe_auth_blah;
 478                 [MonoTODO]
 479                 public bool UnsafeAuthenticatedConnectionSharing
 480                 {
 481                         get { return unsafe_auth_blah; }
 482                         set { unsafe_auth_blah = value; }
 483                 }
 484 #endif
 485
 486                 internal bool GotRequestStream {
 487                         get { return gotRequestStream; }
 488                 }
 489
 490                 internal bool ExpectContinue {
 491                         get { return expectContinue; }
 492                         set { expectContinue = value; }
 493                 }
 494
 495                 internal Uri AuthUri {
 496                         get { return actualUri; }
 497                 }
 498
 499                 internal bool ProxyQuery {
 500                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 501                 }
 502
 503                 // Methods
 504
 505                 internal ServicePoint GetServicePoint ()
 506                 {
 507                         lock (locker) {
 508                                 if (hostChanged || servicePoint == null) {
 509                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 510                                         hostChanged = false;
 511                                 }
 512                         }
 513
 514                         return servicePoint;
 515                 }
 516
 517                 public void AddRange (int range)
 518                 {
 519                         AddRange ("bytes", range);
 520                 }
 521
 522                 public void AddRange (int from, int to)
 523                 {
 524                         AddRange ("bytes", from, to);
 525                 }
 526
 527                 public void AddRange (string rangeSpecifier, int range)
 528                 {
 529                         if (rangeSpecifier == null)
 530                                 throw new ArgumentNullException ("rangeSpecifier");
 531                         string value = webHeaders ["Range"];
 532                         if (value == null || value.Length == 0)
 533                                 value = rangeSpecifier + "=";
 534                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 535                                 value += ",";
 536                         else
 537                                 throw new InvalidOperationException ("rangeSpecifier");
 538                         webHeaders.RemoveAndAdd ("Range", value + range + "-");
 539                 }
 540
 541                 public void AddRange (string rangeSpecifier, int from, int to)
 542                 {
 543                         if (rangeSpecifier == null)
 544                                 throw new ArgumentNullException ("rangeSpecifier");
 545                         if (from < 0 || to < 0 || from > to)
 546                                 throw new ArgumentOutOfRangeException ();
 547                         string value = webHeaders ["Range"];
 548                         if (value == null || value.Length == 0)
 549                                 value = rangeSpecifier + "=";
 550                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 551                                 value += ",";
 552                         else
 553                                 throw new InvalidOperationException ("rangeSpecifier");
 554                         webHeaders.RemoveAndAdd ("Range", value + from + "-" + to);
 555                 }
 556 #if !NET_2_0
 557                 public override int GetHashCode ()
 558                 {
 559                         return base.GetHashCode ();
 560                 }
 561 #endif
 562
 563                 void CommonChecks (bool putpost)
 564                 {
 565                         if (method == null)
 566                                 throw new ProtocolViolationException ("Method is null.");
 567
 568                         if (putpost && ((!keepAlive || (contentLength == -1 && !sendChunked)) && !allowBuffering))
 569                                 throw new ProtocolViolationException ("Content-Length not set");
 570
 571                         string transferEncoding = TransferEncoding;
 572                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 573                                 throw new ProtocolViolationException ("SendChunked should be true.");
 574                 }
 575
 576                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 577                 {
 578                         if (aborted)
 579                                 throw new WebException ("The request was previosly aborted.");
 580
 581                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD");
 582                         if (method == null || !send)
 583                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 584
 585                         CommonChecks (send);
 586
 587                         lock (locker)
 588                         {
 589                                 if (asyncWrite != null) {
 590                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 591                                                                 "method while a previous call is still in progress.");
 592                                 }
 593
 594                                 asyncWrite = new WebAsyncResult (this, callback, state);
 595                                 initialMethod = method;
 596                                 if (haveRequest) {
 597                                         if (writeStream != null) {
 598                                                 asyncWrite.SetCompleted (true, writeStream);
 599                                                 asyncWrite.DoCallback ();
 600                                                 return asyncWrite;
 601                                         }
 602                                 }
 603
 604                                 gotRequestStream = true;
 605                                 WebAsyncResult result = asyncWrite;
 606                                 if (!requestSent) {
 607                                         requestSent = true;
 608                                         redirects = 0;
 609                                         servicePoint = GetServicePoint ();
 610                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 611                                 }
 612                                 return result;
 613                         }
 614                 }
 615
 616                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 617                 {
 618                         if (asyncResult == null)
 619                                 throw new ArgumentNullException ("asyncResult");
 620
 621                         WebAsyncResult result = asyncResult as WebAsyncResult;
 622                         if (result == null)
 623                                 throw new ArgumentException ("Invalid IAsyncResult");
 624
 625                         asyncWrite = result;
 626                         result.WaitUntilComplete ();
 627
 628                         Exception e = result.Exception;
 629                         if (e != null)
 630                                 throw e;
 631
 632                         return result.WriteStream;
 633                 }
 634
 635                 public override Stream GetRequestStream()
 636                 {
 637                         IAsyncResult asyncResult = BeginGetRequestStream (null, null);
 638                         asyncWrite = (WebAsyncResult) asyncResult;
 639                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 640                                 Abort ();
 641                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 642                         }
 643
 644                         return EndGetRequestStream (asyncResult);
 645                 }
 646
 647                 void CheckIfForceWrite ()
 648                 {
 649                         if (writeStream == null || contentLength < 0 || !InternalAllowBuffering)
 650                                 return;
 651
 652                         // This will write the POST/PUT if the write stream already has the expected
 653                         // amount of bytes in it (ContentLength) (bug #77753).
 654                         if (writeStream.WriteBufferLength == contentLength)
 655                                 writeStream.WriteRequest ();
 656                 }
 657
 658                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 659                 {
 660                         bool send = (method == "PUT" || method == "POST");
 661                         if (send) {
 662                                 if ((!KeepAlive || (ContentLength == -1 && !SendChunked)) && !AllowWriteStreamBuffering)
 663                                         throw new ProtocolViolationException ("Content-Length not set");
 664                         }
 665
 666                         CommonChecks (send);
 667                         Monitor.Enter (this);
 668                         getResponseCalled = true;
 669                         if (asyncRead != null && !haveResponse) {
 670                                 Monitor.Exit (this);
 671                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 672                                                         "method while a previous call is still in progress.");
 673                         }
 674
 675                         CheckIfForceWrite ();
 676                         asyncRead = new WebAsyncResult (this, callback, state);
 677                         initialMethod = method;
 678                         if (haveResponse) {
 679                                 if (webResponse != null) {
 680                                         Exception saved = saved_exc;
 681                                         Monitor.Exit (this);
 682                                         if (saved == null) {
 683                                                 asyncRead.SetCompleted (true, webResponse);
 684                                         } else {
 685                                                 asyncRead.SetCompleted (true, saved);
 686                                         }
 687                                         asyncRead.DoCallback ();
 688                                         return asyncRead;
 689                                 }
 690                         }
 691
 692                         if (!requestSent) {
 693                                 requestSent = true;
 694                                 redirects = 0;
 695                                 servicePoint = GetServicePoint ();
 696                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 697                         }
 698
 699                         Monitor.Exit (this);
 700                         return asyncRead;
 701                 }
 702
 703                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 704                 {
 705                         if (asyncResult == null)
 706                                 throw new ArgumentNullException ("asyncResult");
 707
 708                         WebAsyncResult result = asyncResult as WebAsyncResult;
 709                         if (result == null)
 710                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 711
 712                         if (!result.WaitUntilComplete (timeout, false)) {
 713                                 Abort ();
 714                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 715                         }
 716
 717                         if (result.GotException)
 718                                 throw result.Exception;
 719
 720                         return result.Response;
 721                 }
 722
 723                 public override WebResponse GetResponse()
 724                 {
 725                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 726                         return EndGetResponse (result);
 727                 }
 728
 729                 public override void Abort ()
 730                 {
 731                         haveResponse = true;
 732                         aborted = true;
 733                         if (asyncWrite != null) {
 734                                 WebAsyncResult r = asyncWrite;
 735                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 736                                 r.SetCompleted (false, wexc);
 737                                 r.DoCallback ();
 738                                 asyncWrite = null;
 739                         }
 740
 741                         if (asyncRead != null) {
 742                                 WebAsyncResult r = asyncRead;
 743                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 744                                 r.SetCompleted (false, wexc);
 745                                 r.DoCallback ();
 746                                 asyncRead = null;
 747                         }
 748
 749                         if (abortHandler != null) {
 750                                 try {
 751                                         abortHandler (this, EventArgs.Empty);
 752                                 } catch (Exception) {}
 753                                 abortHandler = null;
 754                         }
 755
 756                         if (writeStream != null) {
 757                                 try {
 758                                         writeStream.Close ();
 759                                         writeStream = null;
 760                                 } catch {}
 761                         }
 762
 763                         if (webResponse != null) {
 764                                 try {
 765                                         webResponse.Close ();
 766                                         webResponse = null;
 767                                 } catch {}
 768                         }
 769                 }
 770
 771                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 772                                                   StreamingContext streamingContext)
 773                 {
 774                         SerializationInfo info = serializationInfo;
 775
 776                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 777                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 778                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 779                         info.AddValue ("allowBuffering", allowBuffering);
 780                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 781                         info.AddValue ("connectionGroup", connectionGroup);
 782                         info.AddValue ("contentLength", contentLength);
 783                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 784                         info.AddValue ("keepAlive", keepAlive);
 785                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 786                         info.AddValue ("mediaType", mediaType);
 787                         info.AddValue ("method", method);
 788                         info.AddValue ("initialMethod", initialMethod);
 789                         info.AddValue ("pipelined", pipelined);
 790                         info.AddValue ("version", version, typeof (Version));
 791                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 792                         info.AddValue ("sendChunked", sendChunked);
 793                         info.AddValue ("timeout", timeout);
 794                         info.AddValue ("redirects", redirects);
 795                 }
 796
 797                 void CheckRequestStarted ()
 798                 {
 799                         if (requestSent)
 800                                 throw new InvalidOperationException ("request started");
 801                 }
 802
 803                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 804                 {
 805                         if (continueDelegate != null)
 806                                 continueDelegate (statusCode, headers);
 807                 }
 808
 809                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 810                 {
 811                         redirects++;
 812                         Exception e = null;
 813                         string uriString = null;
 814
 815                         switch (code) {
 816                         case HttpStatusCode.Ambiguous: // 300
 817                                 e = new WebException ("Ambiguous redirect.");
 818                                 break;
 819                         case HttpStatusCode.MovedPermanently: // 301
 820                         case HttpStatusCode.Redirect: // 302
 821                         case HttpStatusCode.TemporaryRedirect: // 307
 822                                 /* MS follows the redirect for POST too
 823                                 if (method != "GET" && method != "HEAD") // 10.3
 824                                         return false;
 825                                 */
 826
 827                                 uriString = webResponse.Headers ["Location"];
 828                                 break;
 829                         case HttpStatusCode.SeeOther: //303
 830                                 method = "GET";
 831                                 uriString = webResponse.Headers ["Location"];
 832                                 break;
 833                         case HttpStatusCode.NotModified: // 304
 834                                 return false;
 835                         case HttpStatusCode.UseProxy: // 305
 836                                 e = new NotImplementedException ("Proxy support not available.");
 837                                 break;
 838                         case HttpStatusCode.Unused: // 306
 839                         default:
 840                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 841                                 break;
 842                         }
 843
 844                         if (e != null)
 845                                 throw e;
 846
 847                         if (uriString == null)
 848                                 throw new WebException ("No Location header found for " + (int) code,
 849                                                         WebExceptionStatus.ProtocolError);
 850
 851                         Uri prev = actualUri;
 852                         try {
 853                                 actualUri = new Uri (actualUri, uriString);
 854                         } catch (Exception) {
 855                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
 856                                                                         uriString, (int) code),
 857                                                                         WebExceptionStatus.ProtocolError);
 858                         }
 859
 860                         hostChanged = (actualUri.Scheme != prev.Scheme || actualUri.Host != prev.Host ||
 861                                         actualUri.Port != prev.Port);
 862                         return true;
 863                 }
 864
 865                 string GetHeaders ()
 866                 {
 867                         bool continue100 = false;
 868                         if (contentLength != -1) {
 869                                 if (contentLength > 0)
 870                                         continue100 = true;
 871                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 872                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 873                         } else if (sendChunked) {
 874                                 continue100 = true;
 875                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
 876                                 webHeaders.RemoveInternal ("Content-Length");
 877                         }
 878
 879                         if (actualVersion == HttpVersion.Version11 && continue100 &&
 880                             servicePoint.SendContinue) { // RFC2616 8.2.3
 881                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
 882                                 expectContinue = true;
 883                         } else {
 884                                 webHeaders.RemoveInternal ("Expect");
 885                                 expectContinue = false;
 886                         }
 887
 888                         string connectionHeader = (ProxyQuery) ? "Proxy-Connection" : "Connection";
 889                         webHeaders.RemoveInternal ((!ProxyQuery) ? "Proxy-Connection" : "Connection");
 890                         bool spoint10 = (servicePoint.ProtocolVersion == null ||
 891                                          servicePoint.ProtocolVersion == HttpVersion.Version10);
 892
 893                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
 894                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
 895                         } else if (!keepAlive && version == HttpVersion.Version11) {
 896                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
 897                         }
 898
 899                         webHeaders.SetInternal ("Host", actualUri.Authority);
 900                         if (cookieContainer != null) {
 901                                 string cookieHeader = cookieContainer.GetCookieHeader (requestUri);
 902                                 if (cookieHeader != "")
 903                                         webHeaders.SetInternal ("Cookie", cookieHeader);
 904                         }
 905
 906                         if (!usedPreAuth && preAuthenticate)
 907                                 DoPreAuthenticate ();
 908
 909                         return webHeaders.ToString ();
 910                 }
 911
 912                 void DoPreAuthenticate ()
 913                 {
 914                         webHeaders.RemoveInternal ("Proxy-Authorization");
 915                         webHeaders.RemoveInternal ("Authorization");
 916                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
 917                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
 918                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
 919                         if (auth == null)
 920                                 return;
 921
 922                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
 923                         webHeaders [authHeader] = auth.Message;
 924                         usedPreAuth = true;
 925                 }
 926
 927                 internal void SetWriteStreamError (WebExceptionStatus status)
 928                 {
 929                         if (aborted)
 930                                 return;
 931
 932                         WebAsyncResult r = asyncWrite;
 933                         if (r == null)
 934                                 r = asyncRead;
 935
 936                         if (r != null) {
 937                                 r.SetCompleted (false, new WebException ("Error: " + status, status));
 938                                 r.DoCallback ();
 939                         }
 940                 }
 941
 942                 internal void SendRequestHeaders ()
 943                 {
 944                         StringBuilder req = new StringBuilder ();
 945                         string query;
 946                         if (!ProxyQuery) {
 947                                 query = actualUri.PathAndQuery;
 948                         } else if (actualUri.IsDefaultPort) {
 949                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
 950                                                                         actualUri.Host,
 951                                                                         actualUri.PathAndQuery);
 952                         } else {
 953                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
 954                                                                            actualUri.Host,
 955                                                                            actualUri.Port,
 956                                                                            actualUri.PathAndQuery);
 957                         }
 958
 959                         if (servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
 960                                 actualVersion = servicePoint.ProtocolVersion;
 961                         } else {
 962                                 actualVersion = version;
 963                         }
 964
 965                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
 966                                                                 actualVersion.Major, actualVersion.Minor);
 967                         req.Append (GetHeaders ());
 968                         string reqstr = req.ToString ();
 969                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
 970                         writeStream.SetHeaders (bytes, 0, bytes.Length);
 971                 }
 972
 973                 internal void SetWriteStream (WebConnectionStream stream)
 974                 {
 975                         if (aborted)
 976                                 return;
 977
 978                         writeStream = stream;
 979                         if (bodyBuffer != null) {
 980                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 981                                 contentLength = bodyBufferLength;
 982                                 writeStream.SendChunked = false;
 983                         }
 984
 985                         SendRequestHeaders ();
 986
 987                         haveRequest = true;
 988
 989                         if (bodyBuffer != null) {
 990                                 // The body has been written and buffered. The request "user"
 991                                 // won't write it again, so we must do it.
 992                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
 993                                 bodyBuffer = null;
 994                                 writeStream.Close ();
 995                         } else if (method == "PUT" || method == "POST") {
 996                                 if (getResponseCalled && !writeStream.RequestWritten)
 997                                         writeStream.WriteRequest ();
 998                         }
 999
1000                         if (asyncWrite != null) {
1001                                 asyncWrite.SetCompleted (false, stream);
1002                                 asyncWrite.DoCallback ();
1003                                 asyncWrite = null;
1004                         }
1005                 }
1006
1007                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1008                 {
1009                         if (aborted)
1010                                 return;
1011                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1012                         WebAsyncResult r = asyncRead;
1013                         if (r == null)
1014                                 r = asyncWrite;
1015
1016                         if (r != null) {
1017                                 WebException wexc;
1018                                 if (e is WebException) {
1019                                         wexc = (WebException) e;
1020                                 } else {
1021                                         wexc = new WebException (msg, e, status, null);
1022                                 }
1023                                 r.SetCompleted (false, wexc);
1024                                 r.DoCallback ();
1025                                 asyncRead = null;
1026                                 asyncWrite = null;
1027                         }
1028                 }
1029
1030                 void CheckSendError (WebConnectionData data)
1031                 {
1032                         // Got here, but no one called GetResponse
1033                         int status = data.StatusCode;
1034                         if (status < 400 || status == 401 || status == 407)
1035                                 return;
1036
1037                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1038                                 // The request has not been completely sent and we got here!
1039                                 // We should probably just close and cause an error in any case,
1040                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1041                                 webResponse.ReadAll ();
1042                         }
1043                 }
1044
1045                 internal void SetResponseData (WebConnectionData data)
1046                 {
1047                         if (aborted) {
1048                                 if (data.stream != null)
1049                                         data.stream.Close ();
1050                                 return;
1051                         }
1052
1053                         WebException wexc = null;
1054                         try {
1055                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1056                                 haveResponse = true;
1057                         } catch (Exception e) {
1058                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1059                                 if (data.stream != null)
1060                                         data.stream.Close ();
1061                         }
1062
1063                         if (wexc == null && (method == "POST" || method == "PUT")) {
1064                                 lock (locker) {
1065                                         CheckSendError (data);
1066                                         if (saved_exc != null)
1067                                                 wexc = (WebException) saved_exc;
1068                                 }
1069                         }
1070
1071                         WebAsyncResult r = asyncRead;
1072                         if (r != null) {
1073                                 if (wexc != null) {
1074                                         r.SetCompleted (false, wexc);
1075                                         r.DoCallback ();
1076                                         return;
1077                                 }
1078
1079                                 bool redirected;
1080                                 try {
1081                                         redirected = CheckFinalStatus (r);
1082                                         if (!redirected) {
1083                                                 r.SetCompleted (false, webResponse);
1084                                                 r.DoCallback ();
1085                                         } else {
1086                                                 if (webResponse != null) {
1087                                                         webResponse.Close ();
1088                                                         webResponse = null;
1089                                                 }
1090                                                 haveResponse = false;
1091                                                 webResponse = null;
1092                                                 r.Reset ();
1093                                                 servicePoint = GetServicePoint ();
1094                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1095                                         }
1096                                 } catch (WebException wexc2) {
1097                                         r.SetCompleted (false, wexc2);
1098                                         r.DoCallback ();
1099                                         return;
1100                                 } catch (Exception ex) {
1101                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1102                                         r.SetCompleted (false, wexc);
1103                                         r.DoCallback ();
1104                                         return;
1105                                 }
1106                         }
1107                 }
1108
1109                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1110                 {
1111                         authCompleted = false;
1112                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1113                                 return false;
1114
1115                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1116                         if (isProxy && (proxy == null || proxy.Credentials == null))
1117                                 return false;
1118
1119                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
1120                         if (authHeader == null)
1121                                 return false;
1122
1123                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1124                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1125                         if (auth == null)
1126                                 return false;
1127
1128                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1129                         authCompleted = auth.Complete;
1130                         return true;
1131                 }
1132
1133                 // Returns true if redirected
1134                 bool CheckFinalStatus (WebAsyncResult result)
1135                 {
1136                         if (result.GotException)
1137                                 throw result.Exception;
1138
1139                         Exception throwMe = result.Exception;
1140                         bodyBuffer = null;
1141
1142                         HttpWebResponse resp = result.Response;
1143                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1144                         HttpStatusCode code = 0;
1145                         if (throwMe == null && webResponse != null) {
1146                                 code = webResponse.StatusCode;
1147                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1148                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1149                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1150                                                 // Keep the written body, so it can be rewritten in the retry
1151                                                 if (InternalAllowBuffering) {
1152                                                         bodyBuffer = writeStream.WriteBuffer;
1153                                                         bodyBufferLength = writeStream.WriteBufferLength;
1154                                                         webResponse.Close ();
1155                                                         return true;
1156                                                 } else if (method != "PUT" && method != "POST") {
1157                                                         webResponse.Close ();
1158                                                         return true;
1159                                                 }
1160
1161                                                 writeStream.InternalClose ();
1162                                                 writeStream = null;
1163                                                 webResponse.Close ();
1164                                                 webResponse = null;
1165
1166                                                 throw new WebException ("This request requires buffering " +
1167                                                                         "of data for authentication or " +
1168                                                                         "redirection to be sucessful.");
1169                                         }
1170                                 }
1171
1172                                 if ((int) code >= 400) {
1173                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1174                                                                     (int) code, webResponse.StatusDescription);
1175                                         throwMe = new WebException (err, null, protoError, webResponse);
1176                                         webResponse.ReadAll ();
1177                                 } else if ((int) code == 304 && allowAutoRedirect) {
1178                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1179                                                                     (int) code, webResponse.StatusDescription);
1180                                         throwMe = new WebException (err, null, protoError, webResponse);
1181                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects > maxAutoRedirect) {
1182                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1183                                                                     protoError, webResponse);
1184                                         webResponse.ReadAll ();
1185                                 }
1186                         }
1187
1188                         if (throwMe == null) {
1189                                 bool b = false;
1190                                 int c = (int) code;
1191                                 if (allowAutoRedirect && c >= 300) {
1192                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1193                                                 bodyBuffer = writeStream.WriteBuffer;
1194                                                 bodyBufferLength = writeStream.WriteBufferLength;
1195                                         }
1196                                         b = Redirect (result, code);
1197                                 }
1198
1199                                 if (resp != null && c >= 300 && c != 304)
1200                                         resp.ReadAll ();
1201
1202                                 return b;
1203                         }
1204
1205                         if (writeStream != null) {
1206                                 writeStream.InternalClose ();
1207                                 writeStream = null;
1208                         }
1209
1210                         webResponse = null;
1211
1212                         throw throwMe;
1213                 }
1214         }
1215 }
1216