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 //
  11
  12 using System;
  13 using System.Collections;
  14 using System.IO;
  15 using System.Net.Sockets;
  16 using System.Runtime.Remoting.Messaging;
  17 using System.Runtime.Serialization;
  18 using System.Security.Cryptography.X509Certificates;
  19 using System.Text;
  20 using System.Threading;
  21
  22 namespace System.Net
  23 {
  24         [Serializable]
  25         public class HttpWebRequest : WebRequest, ISerializable
  26         {
  27                 Uri requestUri;
  28                 Uri actualUri;
  29                 bool hostChanged;
  30                 bool allowAutoRedirect = true;
  31                 bool allowBuffering = true;
  32                 X509CertificateCollection certificates;
  33                 string connectionGroup;
  34                 long contentLength = -1;
  35                 HttpContinueDelegate continueDelegate;
  36                 CookieContainer cookieContainer;
  37                 ICredentials credentials;
  38                 bool haveResponse;
  39                 bool haveRequest;
  40                 bool requestSent;
  41                 WebHeaderCollection webHeaders = new WebHeaderCollection (true);
  42                 bool keepAlive = true;
  43                 int maxAutoRedirect = 50;
  44                 string mediaType = String.Empty;
  45                 string method = "GET";
  46                 string initialMethod = "GET";
  47                 bool pipelined = true;
  48                 bool preAuthenticate;
  49                 Version version = HttpVersion.Version11;
  50                 IWebProxy proxy;
  51                 bool sendChunked;
  52                 ServicePoint servicePoint;
  53                 int timeout = 100000;
  54
  55                 WebConnectionStream writeStream;
  56                 HttpWebResponse webResponse;
  57                 WebAsyncResult asyncWrite;
  58                 WebAsyncResult asyncRead;
  59                 EventHandler abortHandler;
  60                 bool aborted;
  61                 bool gotRequestStream;
  62                 int redirects;
  63                 bool expectContinue;
  64                 bool authCompleted;
  65                 byte[] bodyBuffer;
  66                 int bodyBufferLength;
  67
  68                 // Constructors
  69
  70                 internal HttpWebRequest (Uri uri)
  71                 {
  72                         this.requestUri = uri;
  73                         this.actualUri = uri;
  74                         this.proxy = GlobalProxySelection.Select;
  75                 }
  76
  77                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
  78                 {
  79                         SerializationInfo info = serializationInfo;
  80
  81                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
  82                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
  83                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
  84                         allowBuffering = info.GetBoolean ("allowBuffering");
  85                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
  86                         connectionGroup = info.GetString ("connectionGroup");
  87                         contentLength = info.GetInt64 ("contentLength");
  88                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
  89                         keepAlive = info.GetBoolean ("keepAlive");
  90                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
  91                         mediaType = info.GetString ("mediaType");
  92                         method = info.GetString ("method");
  93                         initialMethod = info.GetString ("initialMethod");
  94                         pipelined = info.GetBoolean ("pipelined");
  95                         version = (Version) info.GetValue ("version", typeof (Version));
  96                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
  97                         sendChunked = info.GetBoolean ("sendChunked");
  98                         timeout = info.GetInt32 ("timeout");
  99                         redirects = info.GetInt32 ("redirects");
 100                 }
 101
 102                 // Properties
 103
 104                 public string Accept {
 105                         get { return webHeaders ["Accept"]; }
 106                         set {
 107                                 CheckRequestStarted ();
 108                                 webHeaders.SetInternal ("Accept", value);
 109                         }
 110                 }
 111
 112                 public Uri Address {
 113                         get { return actualUri; }
 114                 }
 115
 116                 public bool AllowAutoRedirect {
 117                         get { return allowAutoRedirect; }
 118                         set { this.allowAutoRedirect = value; }
 119                 }
 120
 121                 public bool AllowWriteStreamBuffering {
 122                         get { return allowBuffering; }
 123                         set { allowBuffering = value; }
 124                 }
 125
 126                 internal bool InternalAllowBuffering {
 127                         get {
 128                                 return (allowBuffering && (method == "PUT" || method == "POST"));
 129                         }
 130                 }
 131
 132                 public X509CertificateCollection ClientCertificates {
 133                         get {
 134                                 if (certificates == null)
 135                                         certificates = new X509CertificateCollection ();
 136
 137                                 return certificates;
 138                         }
 139                 }
 140
 141                 public string Connection {
 142                         get { return webHeaders ["Connection"]; }
 143                         set {
 144                                 CheckRequestStarted ();
 145                                 string val = value;
 146                                 if (val != null)
 147                                         val = val.Trim ().ToLower ();
 148
 149                                 if (val == null || val.Length == 0) {
 150                                         webHeaders.RemoveInternal ("Connection");
 151                                         return;
 152                                 }
 153
 154                                 if (val == "keep-alive" || val == "close")
 155                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 156
 157                                 if (keepAlive && val.IndexOf ("keep-alive") == -1)
 158                                         value = value + ", Keep-Alive";
 159
 160                                 webHeaders.SetInternal ("Connection", value);
 161                         }
 162                 }
 163
 164                 public override string ConnectionGroupName {
 165                         get { return connectionGroup; }
 166                         set { connectionGroup = value; }
 167                 }
 168
 169                 public override long ContentLength {
 170                         get { return contentLength; }
 171                         set {
 172                                 CheckRequestStarted ();
 173                                 if (value < 0)
 174                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 175
 176                                 contentLength = value;
 177                         }
 178                 }
 179
 180                 internal long InternalContentLength {
 181                         set { contentLength = value; }
 182                 }
 183
 184                 public override string ContentType {
 185                         get { return webHeaders ["Content-Type"]; }
 186                         set {
 187                                 CheckRequestStarted ();
 188                                 if (value == null || value.Trim().Length == 0) {
 189                                         webHeaders.RemoveInternal ("Content-Type");
 190                                         return;
 191                                 }
 192                                 webHeaders.SetInternal ("Content-Type", value);
 193                         }
 194                 }
 195
 196                 public HttpContinueDelegate ContinueDelegate {
 197                         get { return continueDelegate; }
 198                         set { continueDelegate = value; }
 199                 }
 200
 201                 public CookieContainer CookieContainer {
 202                         get { return cookieContainer; }
 203                         set { cookieContainer = value; }
 204                 }
 205
 206                 public override ICredentials Credentials {
 207                         get { return credentials; }
 208                         set { credentials = value; }
 209                 }
 210
 211                 public string Expect {
 212                         get { return webHeaders ["Expect"]; }
 213                         set {
 214                                 CheckRequestStarted ();
 215                                 string val = value;
 216                                 if (val != null)
 217                                         val = val.Trim ().ToLower ();
 218
 219                                 if (val == null || val.Length == 0) {
 220                                         webHeaders.RemoveInternal ("Expect");
 221                                         return;
 222                                 }
 223
 224                                 if (val == "100-continue")
 225                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 226                                                                      "value");
 227                                 webHeaders.SetInternal ("Expect", value);
 228                         }
 229                 }
 230
 231                 public bool HaveResponse {
 232                         get { return haveResponse; }
 233                 }
 234
 235                 public override WebHeaderCollection Headers {
 236                         get { return webHeaders; }
 237                         set {
 238                                 CheckRequestStarted ();
 239                                 WebHeaderCollection newHeaders = new WebHeaderCollection (true);
 240                                 int count = value.Count;
 241                                 for (int i = 0; i < count; i++)
 242                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 243
 244                                 webHeaders = newHeaders;
 245                         }
 246                 }
 247
 248                 public DateTime IfModifiedSince {
 249                         get {
 250                                 string str = webHeaders ["If-Modified-Since"];
 251                                 if (str == null)
 252                                         return DateTime.Now;
 253                                 try {
 254                                         return MonoHttpDate.Parse (str);
 255                                 } catch (Exception) {
 256                                         return DateTime.Now;
 257                                 }
 258                         }
 259                         set {
 260                                 CheckRequestStarted ();
 261                                 // rfc-1123 pattern
 262                                 webHeaders.SetInternal ("If-Modified-Since",
 263                                         value.ToUniversalTime ().ToString ("r", null));
 264                                 // TODO: check last param when using different locale
 265                         }
 266                 }
 267
 268                 public bool KeepAlive {
 269                         get {
 270                                 return keepAlive;
 271                         }
 272                         set {
 273                                 keepAlive = value;
 274                         }
 275                 }
 276
 277                 public int MaximumAutomaticRedirections {
 278                         get { return maxAutoRedirect; }
 279                         set {
 280                                 if (value <= 0)
 281                                         throw new ArgumentException ("Must be > 0", "value");
 282
 283                                 maxAutoRedirect = value;
 284                         }
 285                 }
 286
 287                 public string MediaType {
 288                         get { return mediaType; }
 289                         set {
 290                                 mediaType = value;
 291                         }
 292                 }
 293
 294                 public override string Method {
 295                         get { return this.method; }
 296                         set {
 297                                 if (value == null || value.Trim () == "")
 298                                         throw new ArgumentException ("not a valid method");
 299
 300                                 method = value;
 301                         }
 302                 }
 303
 304                 public bool Pipelined {
 305                         get { return pipelined; }
 306                         set { pipelined = value; }
 307                 }
 308
 309                 public override bool PreAuthenticate {
 310                         get { return preAuthenticate; } //TODO: support preauthentication
 311                         set { preAuthenticate = value; }
 312                 }
 313
 314                 public Version ProtocolVersion {
 315                         get { return version; }
 316                         set {
 317                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 318                                         throw new ArgumentException ("value");
 319
 320                                 version = value;
 321                         }
 322                 }
 323
 324                 public override IWebProxy Proxy {
 325                         get { return proxy; }
 326                         set {
 327                                 CheckRequestStarted ();
 328                                 if (value == null)
 329                                         throw new ArgumentNullException ("value");
 330
 331                                 proxy = value;
 332                                 servicePoint = null; // we may need a new one
 333                         }
 334                 }
 335
 336                 public string Referer {
 337                         get { return webHeaders ["Referer"]; }
 338                         set {
 339                                 CheckRequestStarted ();
 340                                 if (value == null || value.Trim().Length == 0) {
 341                                         webHeaders.RemoveInternal ("Referer");
 342                                         return;
 343                                 }
 344                                 webHeaders.SetInternal ("Referer", value);
 345                         }
 346                 }
 347
 348                 public override Uri RequestUri {
 349                         get { return requestUri; }
 350                 }
 351
 352                 public bool SendChunked {
 353                         get { return sendChunked; }
 354                         set {
 355                                 CheckRequestStarted ();
 356                                 sendChunked = value;
 357                         }
 358                 }
 359
 360                 public ServicePoint ServicePoint {
 361                         get { return GetServicePoint (); }
 362                 }
 363
 364                 public override int Timeout {
 365                         get { return timeout; }
 366                         set {
 367                                 if (value < -1)
 368                                         throw new ArgumentOutOfRangeException ("value");
 369
 370                                 timeout = value;
 371                         }
 372                 }
 373
 374                 public string TransferEncoding {
 375                         get { return webHeaders ["Transfer-Encoding"]; }
 376                         set {
 377                                 CheckRequestStarted ();
 378                                 string val = value;
 379                                 if (val != null)
 380                                         val = val.Trim ().ToLower ();
 381
 382                                 if (val == null || val.Length == 0) {
 383                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 384                                         return;
 385                                 }
 386
 387                                 if (val == "chunked")
 388                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 389
 390                                 if (!sendChunked)
 391                                         throw new ArgumentException ("SendChunked must be True", "value");
 392
 393                                 webHeaders.SetInternal ("Transfer-Encoding", value);
 394                         }
 395                 }
 396
 397                 public string UserAgent {
 398                         get { return webHeaders ["User-Agent"]; }
 399                         set { webHeaders.SetInternal ("User-Agent", value); }
 400                 }
 401
 402 #if NET_1_1
 403                 [MonoTODO]
 404                 public bool UnsafeAuthenticatedConnectionSharing
 405                 {
 406                         get { throw new NotImplementedException (); }
 407                         set { throw new NotImplementedException (); }
 408                 }
 409 #endif
 410
 411                 internal bool GotRequestStream {
 412                         get { return gotRequestStream; }
 413                 }
 414
 415                 internal bool ExpectContinue {
 416                         get { return expectContinue; }
 417                         set { expectContinue = value; }
 418                 }
 419
 420                 internal Uri AuthUri {
 421                         get { return actualUri; }
 422                 }
 423
 424                 internal bool ProxyQuery {
 425                         get { return servicePoint.UsesProxy; }
 426                 }
 427
 428                 // Methods
 429
 430                 internal ServicePoint GetServicePoint ()
 431                 {
 432                         if (!hostChanged && servicePoint != null)
 433                                 return servicePoint;
 434
 435                         lock (this) {
 436                                 if (hostChanged || servicePoint == null) {
 437                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 438                                         hostChanged = false;
 439                                 }
 440                         }
 441
 442                         return servicePoint;
 443                 }
 444
 445                 public void AddRange (int range)
 446                 {
 447                         AddRange ("bytes", range);
 448                 }
 449
 450                 public void AddRange (int from, int to)
 451                 {
 452                         AddRange ("bytes", from, to);
 453                 }
 454
 455                 public void AddRange (string rangeSpecifier, int range)
 456                 {
 457                         if (rangeSpecifier == null)
 458                                 throw new ArgumentNullException ("rangeSpecifier");
 459                         string value = webHeaders ["Range"];
 460                         if (value == null || value.Length == 0)
 461                                 value = rangeSpecifier + "=";
 462                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 463                                 value += ",";
 464                         else
 465                                 throw new InvalidOperationException ("rangeSpecifier");
 466                         webHeaders.SetInternal ("Range", value + range + "-");
 467                 }
 468
 469                 public void AddRange (string rangeSpecifier, int from, int to)
 470                 {
 471                         if (rangeSpecifier == null)
 472                                 throw new ArgumentNullException ("rangeSpecifier");
 473                         if (from < 0 || to < 0 || from > to)
 474                                 throw new ArgumentOutOfRangeException ();
 475                         string value = webHeaders ["Range"];
 476                         if (value == null || value.Length == 0)
 477                                 value = rangeSpecifier + "=";
 478                         else if (value.ToLower ().StartsWith (rangeSpecifier.ToLower () + "="))
 479                                 value += ",";
 480                         else
 481                                 throw new InvalidOperationException ("rangeSpecifier");
 482                         webHeaders.SetInternal ("Range", value + from + "-" + to);
 483                 }
 484
 485                 public override int GetHashCode ()
 486                 {
 487                         return base.GetHashCode ();
 488                 }
 489
 490                 void CommonChecks (bool putpost)
 491                 {
 492                         if (method == null)
 493                                 throw new ProtocolViolationException ("Method is null.");
 494
 495                         if (putpost && ((!keepAlive || (contentLength == -1 && !sendChunked)) && !allowBuffering))
 496                                 throw new ProtocolViolationException ("Content-Length not set");
 497
 498                         string transferEncoding = TransferEncoding;
 499                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 500                                 throw new ProtocolViolationException ("SendChunked should be true.");
 501                 }
 502
 503                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 504                 {
 505                         if (aborted)
 506                                 throw new WebException ("The request was previosly aborted.");
 507
 508                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD");
 509                         if (method == null || !send)
 510                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 511
 512                         CommonChecks (send);
 513                         Monitor.Enter (this);
 514                         if (asyncWrite != null) {
 515                                 Monitor.Exit (this);
 516                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 517                                                         "method while a previous call is still in progress.");
 518                         }
 519
 520                         asyncWrite = new WebAsyncResult (this, callback, state);
 521                         initialMethod = method;
 522                         if (haveRequest) {
 523                                 if (writeStream != null) {
 524                                         Monitor.Exit (this);
 525                                         asyncWrite.SetCompleted (true, writeStream);
 526                                         asyncWrite.DoCallback ();
 527                                         return asyncWrite;
 528                                 }
 529                         }
 530
 531                         gotRequestStream = true;
 532                         WebAsyncResult result = asyncWrite;
 533                         if (!requestSent) {
 534                                 requestSent = true;
 535                                 servicePoint = GetServicePoint ();
 536                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 537                         }
 538                         Monitor.Exit (this);
 539                         return result;
 540                 }
 541
 542                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 543                 {
 544                         if (asyncResult == null)
 545                                 throw new ArgumentNullException ("asyncResult");
 546
 547                         WebAsyncResult result = asyncResult as WebAsyncResult;
 548                         if (result == null)
 549                                 throw new ArgumentException ("Invalid IAsyncResult");
 550
 551                         asyncWrite = result;
 552                         result.WaitUntilComplete ();
 553
 554                         Exception e = result.Exception;
 555                         if (e != null)
 556                                 throw e;
 557
 558                         return result.WriteStream;
 559                 }
 560
 561                 public override Stream GetRequestStream()
 562                 {
 563                         IAsyncResult asyncResult = BeginGetRequestStream (null, null);
 564                         asyncWrite = (WebAsyncResult) asyncResult;
 565                         if (!asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 566                                 Abort ();
 567                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 568                         }
 569
 570                         return EndGetRequestStream (asyncResult);
 571                 }
 572
 573                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 574                 {
 575                         bool send = (method == "PUT" || method == "POST");
 576                         if (send) {
 577                                 if ((!KeepAlive || (ContentLength == -1 && !SendChunked)) && !AllowWriteStreamBuffering)
 578                                         throw new ProtocolViolationException ("Content-Length not set");
 579                         }
 580
 581                         CommonChecks (send);
 582                         Monitor.Enter (this);
 583                         if (asyncRead != null && !haveResponse) {
 584                                 Monitor.Exit (this);
 585                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 586                                                         "method while a previous call is still in progress.");
 587                         }
 588
 589                         asyncRead = new WebAsyncResult (this, callback, state);
 590                         initialMethod = method;
 591                         if (haveResponse) {
 592                                 if (webResponse != null) {
 593                                         Monitor.Exit (this);
 594                                         asyncRead.SetCompleted (true, webResponse);
 595                                         asyncRead.DoCallback ();
 596                                         return asyncRead;
 597                                 }
 598                         }
 599
 600                         if (!requestSent) {
 601                                 requestSent = true;
 602                                 servicePoint = GetServicePoint ();
 603                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 604                         }
 605
 606                         Monitor.Exit (this);
 607                         return asyncRead;
 608                 }
 609
 610                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 611                 {
 612                         if (asyncResult == null)
 613                                 throw new ArgumentNullException ("asyncResult");
 614
 615                         WebAsyncResult result = asyncResult as WebAsyncResult;
 616                         if (result == null)
 617                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 618
 619                         redirects = 0;
 620                         bool redirected = false;
 621                         asyncRead = result;
 622                         do {
 623                                 if (redirected) {
 624                                         haveResponse = false;
 625                                         result.Reset ();
 626                                         servicePoint = GetServicePoint ();
 627                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 628                                 }
 629
 630                                 if (!result.WaitUntilComplete (timeout, false)) {
 631                                         Abort ();
 632                                         throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 633                                 }
 634
 635                                 redirected = CheckFinalStatus (result);
 636                         } while (redirected);
 637
 638                         return result.Response;
 639                 }
 640
 641                 public override WebResponse GetResponse()
 642                 {
 643                         if (haveResponse && webResponse != null)
 644                                 return webResponse;
 645
 646                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 647                         return EndGetResponse (result);
 648                 }
 649
 650                 public override void Abort ()
 651                 {
 652                         haveResponse = true;
 653                         aborted = true;
 654                         if (asyncWrite != null) {
 655                                 WebAsyncResult r = asyncWrite;
 656                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 657                                 r.SetCompleted (false, wexc);
 658                                 r.DoCallback ();
 659                                 asyncWrite = null;
 660                         }
 661
 662                         if (asyncRead != null) {
 663                                 WebAsyncResult r = asyncRead;
 664                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 665                                 r.SetCompleted (false, wexc);
 666                                 r.DoCallback ();
 667                                 asyncRead = null;
 668                         }
 669
 670                         if (abortHandler != null) {
 671                                 try {
 672                                         abortHandler (this, EventArgs.Empty);
 673                                 } catch {}
 674                                 abortHandler = null;
 675                         }
 676
 677                         if (writeStream != null) {
 678                                 try {
 679                                         writeStream.Close ();
 680                                         writeStream = null;
 681                                 } catch {}
 682                         }
 683
 684                         if (webResponse != null) {
 685                                 try {
 686                                         webResponse.Close ();
 687                                         webResponse = null;
 688                                 } catch {}
 689                         }
 690                 }
 691
 692                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
 693                                                   StreamingContext streamingContext)
 694                 {
 695                         SerializationInfo info = serializationInfo;
 696
 697                         info.AddValue ("requestUri", requestUri, typeof (Uri));
 698                         info.AddValue ("actualUri", actualUri, typeof (Uri));
 699                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
 700                         info.AddValue ("allowBuffering", allowBuffering);
 701                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
 702                         info.AddValue ("connectionGroup", connectionGroup);
 703                         info.AddValue ("contentLength", contentLength);
 704                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
 705                         info.AddValue ("keepAlive", keepAlive);
 706                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
 707                         info.AddValue ("mediaType", mediaType);
 708                         info.AddValue ("method", method);
 709                         info.AddValue ("initialMethod", initialMethod);
 710                         info.AddValue ("pipelined", pipelined);
 711                         info.AddValue ("version", version, typeof (Version));
 712                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
 713                         info.AddValue ("sendChunked", sendChunked);
 714                         info.AddValue ("timeout", timeout);
 715                         info.AddValue ("redirects", redirects);
 716                 }
 717
 718                 void CheckRequestStarted ()
 719                 {
 720                         if (requestSent)
 721                                 throw new InvalidOperationException ("request started");
 722                 }
 723
 724                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
 725                 {
 726                         if (continueDelegate != null)
 727                                 continueDelegate (statusCode, headers);
 728                 }
 729
 730                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
 731                 {
 732                         redirects++;
 733                         Exception e = null;
 734                         string uriString = null;
 735
 736                         switch (code) {
 737                         case HttpStatusCode.Ambiguous: // 300
 738                                 e = new WebException ("Ambiguous redirect.");
 739                                 break;
 740                         case HttpStatusCode.MovedPermanently: // 301
 741                         case HttpStatusCode.Redirect: // 302
 742                         case HttpStatusCode.TemporaryRedirect: // 307
 743                                 if (method != "GET" && method != "HEAD") // 10.3
 744                                         return false;
 745
 746                                 uriString = webResponse.Headers ["Location"];
 747                                 break;
 748                         case HttpStatusCode.SeeOther: //303
 749                                 method = "GET";
 750                                 uriString = webResponse.Headers ["Location"];
 751                                 break;
 752                         case HttpStatusCode.NotModified: // 304
 753                                 return false;
 754                         case HttpStatusCode.UseProxy: // 305
 755                                 e = new NotImplementedException ("Proxy support not available.");
 756                                 break;
 757                         case HttpStatusCode.Unused: // 306
 758                         default:
 759                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
 760                                 break;
 761                         }
 762
 763                         if (e != null)
 764                                 throw e;
 765
 766                         string host = actualUri.Host;
 767                         actualUri = new Uri (actualUri, uriString);
 768                         hostChanged = (actualUri.Host != host);
 769                         return true;
 770                 }
 771
 772                 string GetHeaders ()
 773                 {
 774                         bool continue100 = false;
 775                         if (gotRequestStream && contentLength != -1) {
 776                                 continue100 = true;
 777                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
 778                         } else if (sendChunked) {
 779                                 continue100 = true;
 780                                 webHeaders.SetInternal ("Transfer-Encoding", "chunked");
 781                         }
 782
 783                         if (version == HttpVersion.Version11 && continue100 &&
 784                             servicePoint.SendContinue) { // RFC2616 8.2.3
 785                                 webHeaders.SetInternal ("Expect" , "100-continue");
 786                                 expectContinue = true;
 787                         } else {
 788                                 expectContinue = false;
 789                         }
 790
 791                         string connectionHeader = (ProxyQuery) ? "Proxy-Connection" : "Connection";
 792                         webHeaders.RemoveInternal ((!ProxyQuery) ? "Proxy-Connection" : "Connection");
 793
 794                         if (keepAlive && version == HttpVersion.Version10) {
 795                                 webHeaders.SetInternal (connectionHeader, "keep-alive");
 796                         } else if (!keepAlive && version == HttpVersion.Version11) {
 797                                 webHeaders.SetInternal (connectionHeader, "close");
 798                         }
 799
 800                         webHeaders.SetInternal ("Host", actualUri.Host);
 801                         if (cookieContainer != null) {
 802                                 string cookieHeader = cookieContainer.GetCookieHeader (requestUri);
 803                                 if (cookieHeader != "")
 804                                         webHeaders.SetInternal ("Cookie", cookieHeader);
 805                         }
 806
 807                         return webHeaders.ToString ();
 808                 }
 809
 810                 internal void SetWriteStreamError (WebExceptionStatus status)
 811                 {
 812                         if (aborted)
 813                                 return;
 814
 815                         WebAsyncResult r = asyncWrite;
 816                         if (r == null)
 817                                 r = asyncRead;
 818
 819                         if (r != null) {
 820                                 r.SetCompleted (false, new WebException ("Error: " + status, status));
 821                                 r.DoCallback ();
 822                         }
 823                 }
 824
 825                 internal void SendRequestHeaders ()
 826                 {
 827                         StringBuilder req = new StringBuilder ();
 828                         string query;
 829                         if (!ProxyQuery) {
 830                                 query = actualUri.PathAndQuery;
 831                         } else if (actualUri.IsDefaultPort) {
 832                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
 833                                                                         actualUri.Host,
 834                                                                         actualUri.PathAndQuery);
 835                         } else {
 836                                 query = String.Format ("{0}://{1}:{2}{3}", actualUri.Scheme,
 837                                                                            actualUri.Host,
 838                                                                            actualUri.Port,
 839                                                                            actualUri.PathAndQuery);
 840                         }
 841
 842                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query, version.Major, version.Minor);
 843                         req.Append (GetHeaders ());
 844                         string reqstr = req.ToString ();
 845                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
 846                         writeStream.SetHeaders (bytes, 0, bytes.Length);
 847                 }
 848
 849                 internal void SetWriteStream (WebConnectionStream stream)
 850                 {
 851                         if (aborted)
 852                                 return;
 853
 854                         writeStream = stream;
 855                         if (bodyBuffer != null) {
 856                                 webHeaders.RemoveInternal ("Transfer-Encoding");
 857                                 contentLength = bodyBufferLength;
 858                                 writeStream.SendChunked = false;
 859                         }
 860
 861                         SendRequestHeaders ();
 862
 863                         haveRequest = true;
 864
 865                         if (bodyBuffer != null) {
 866                                 // The body has been written and buffered. The request "user"
 867                                 // won't write it again, so we must do it.
 868                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
 869                                 bodyBuffer = null;
 870                                 writeStream.Close ();
 871                         }
 872
 873                         if (asyncWrite != null) {
 874                                 asyncWrite.SetCompleted (false, stream);
 875                                 asyncWrite.DoCallback ();
 876                                 asyncWrite = null;
 877                         }
 878                 }
 879
 880                 internal void SetResponseError (WebExceptionStatus status, Exception e)
 881                 {
 882                         WebAsyncResult r = asyncRead;
 883                         if (r == null)
 884                                 r = asyncWrite;
 885
 886                         if (r != null) {
 887                                 WebException wexc = new WebException ("Error getting response stream", e, status, null);
 888                                 r.SetCompleted (false, wexc);
 889                                 r.DoCallback ();
 890                                 asyncRead = null;
 891                                 asyncWrite = null;
 892                         }
 893                 }
 894
 895                 internal void SetResponseData (WebConnectionData data)
 896                 {
 897                         if (aborted) {
 898                                 if (data.stream != null)
 899                                         data.stream.Close ();
 900                                 return;
 901                         }
 902
 903                         webResponse = new HttpWebResponse (actualUri, method, data, (cookieContainer != null));
 904                         haveResponse = true;
 905
 906                         WebAsyncResult r = asyncRead;
 907                         if (r != null) {
 908                                 r.SetCompleted (false, webResponse);
 909                                 r.DoCallback ();
 910                         }
 911                 }
 912
 913                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
 914                 {
 915                         authCompleted = false;
 916                         if (code == HttpStatusCode.Unauthorized && credentials == null)
 917                                 return false;
 918
 919                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
 920                         if (isProxy && (proxy == null || proxy.Credentials == null))
 921                                 return false;
 922
 923                         string authHeader = response.Headers [(isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate"];
 924                         if (authHeader == null)
 925                                 return false;
 926
 927                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
 928                         Authorization auth = AuthenticationManager.Authenticate (authHeader, this, creds);
 929                         if (auth == null)
 930                                 return false;
 931
 932                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
 933                         authCompleted = auth.Complete;
 934                         return true;
 935                 }
 936
 937                 // Returns true if redirected
 938                 bool CheckFinalStatus (WebAsyncResult result)
 939                 {
 940                         if (result.GotException)
 941                                 throw result.Exception;
 942
 943                         Exception throwMe = result.Exception;
 944                         bodyBuffer = null;
 945
 946                         HttpWebResponse resp = result.Response;
 947                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
 948                         HttpStatusCode code = 0;
 949                         if (throwMe == null && webResponse != null) {
 950                                 code  = webResponse.StatusCode;
 951                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
 952                                                         code == HttpStatusCode.ProxyAuthenticationRequired)) {
 953                                         if (CheckAuthorization (webResponse, code)) {
 954                                                 // Keep the written body, so it can be rewritten in the retry
 955                                                 if (allowBuffering) {
 956                                                         bodyBuffer = writeStream.WriteBuffer;
 957                                                         bodyBufferLength = writeStream.WriteBufferLength;
 958                                                         return true;
 959                                                 }
 960
 961                                                 writeStream.InternalClose ();
 962                                                 writeStream = null;
 963                                                 webResponse = null;
 964                                                 throw new WebException ("This request requires buffering " +
 965                                                                         "of data for authentication or " +
 966                                                                         "redirection to be sucessful.");
 967                                         }
 968                                 }
 969
 970                                 if ((int) code >= 400) {
 971                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
 972                                                                     (int) code, webResponse.StatusDescription);
 973                                         throwMe = new WebException (err, null, protoError, webResponse);
 974                                 } else if ((int) code == 304 && allowAutoRedirect) {
 975                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
 976                                                                     (int) code, webResponse.StatusDescription);
 977                                         throwMe = new WebException (err, null, protoError, webResponse);
 978                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects > maxAutoRedirect) {
 979                                         throwMe = new WebException ("Max. redirections exceeded.", null,
 980                                                                     protoError, webResponse);
 981                                 }
 982                         }
 983
 984                         if (throwMe == null) {
 985                                 bool b = false;
 986                                 if (allowAutoRedirect && (int) code >= 300)
 987                                         b = Redirect (result, code);
 988
 989                                 return b;
 990                         }
 991
 992                         if (writeStream != null) {
 993                                 writeStream.InternalClose ();
 994                                 writeStream = null;
 995                         }
 996
 997                         if (webResponse != null)
 998                                 webResponse = null;
 999
1000                         throw throwMe;
1001                 }
1002         }
1003 }
1004