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.Globalization;
  38 using System.IO;
  39 using System.Net;
  40 using System.Net.Cache;
  41 using System.Net.Sockets;
  42 using System.Runtime.Remoting.Messaging;
  43 using System.Runtime.Serialization;
  44 using System.Security.Cryptography.X509Certificates;
  45 using System.Text;
  46 using System.Threading;
  47
  48 namespace System.Net
  49 {
  50         [Serializable]
  51         public class HttpWebRequest : WebRequest, ISerializable {
  52                 Uri requestUri;
  53                 Uri actualUri;
  54                 bool hostChanged;
  55                 bool allowAutoRedirect = true;
  56                 bool allowBuffering = true;
  57                 X509CertificateCollection certificates;
  58                 string connectionGroup;
  59                 bool haveContentLength;
  60                 long contentLength = -1;
  61                 HttpContinueDelegate continueDelegate;
  62                 CookieContainer cookieContainer;
  63                 ICredentials credentials;
  64                 bool haveResponse;
  65                 bool haveRequest;
  66                 bool requestSent;
  67                 WebHeaderCollection webHeaders;
  68                 bool keepAlive = true;
  69                 int maxAutoRedirect = 50;
  70                 string mediaType = String.Empty;
  71                 string method = "GET";
  72                 string initialMethod = "GET";
  73                 bool pipelined = true;
  74                 bool preAuthenticate;
  75                 bool usedPreAuth;
  76                 Version version = HttpVersion.Version11;
  77                 bool force_version;
  78                 Version actualVersion;
  79                 IWebProxy proxy;
  80                 bool sendChunked;
  81                 ServicePoint servicePoint;
  82                 int timeout = 100000;
  83
  84                 WebConnectionStream writeStream;
  85                 HttpWebResponse webResponse;
  86                 WebAsyncResult asyncWrite;
  87                 WebAsyncResult asyncRead;
  88                 EventHandler abortHandler;
  89                 int aborted;
  90                 bool gotRequestStream;
  91                 int redirects;
  92                 bool expectContinue;
  93                 byte[] bodyBuffer;
  94                 int bodyBufferLength;
  95                 bool getResponseCalled;
  96                 Exception saved_exc;
  97                 object locker = new object ();
  98                 bool finished_reading;
  99                 internal WebConnection WebConnection;
 100                 DecompressionMethods auto_decomp;
 101                 int maxResponseHeadersLength;
 102                 static int defaultMaxResponseHeadersLength;
 103                 int readWriteTimeout = 300000; // ms
 104
 105                 enum NtlmAuthState {
 106                         None,
 107                         Challenge,
 108                         Response
 109                 }
 110                 AuthorizationState auth_state, proxy_auth_state;
 111                 string host;
 112
 113                 // Constructors
 114                 static HttpWebRequest ()
 115                 {
 116                         defaultMaxResponseHeadersLength = 64 * 1024;
 117 #if !NET_2_1
 118                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 119                         if (config != null) {
 120                                 int x = config.MaxResponseHeadersLength;
 121                                 if (x != -1)
 122                                         x *= 64;
 123
 124                                 defaultMaxResponseHeadersLength = x;
 125                         }
 126 #endif
 127                 }
 128
 129 #if NET_2_1
 130                 public
 131 #else
 132                 internal
 133 #endif
 134                 HttpWebRequest (Uri uri)
 135                 {
 136                         this.requestUri = uri;
 137                         this.actualUri = uri;
 138                         this.proxy = GlobalProxySelection.Select;
 139                         this.webHeaders = new WebHeaderCollection (WebHeaderCollection.HeaderInfo.Request);
 140                         ThrowOnError = true;
 141                         ResetAuthorization ();
 142                 }
 143
 144                 [Obsolete ("Serialization is obsoleted for this type", false)]
 145                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 146                 {
 147                         SerializationInfo info = serializationInfo;
 148
 149                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 150                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 151                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 152                         allowBuffering = info.GetBoolean ("allowBuffering");
 153                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 154                         connectionGroup = info.GetString ("connectionGroup");
 155                         contentLength = info.GetInt64 ("contentLength");
 156                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 157                         keepAlive = info.GetBoolean ("keepAlive");
 158                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 159                         mediaType = info.GetString ("mediaType");
 160                         method = info.GetString ("method");
 161                         initialMethod = info.GetString ("initialMethod");
 162                         pipelined = info.GetBoolean ("pipelined");
 163                         version = (Version) info.GetValue ("version", typeof (Version));
 164                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 165                         sendChunked = info.GetBoolean ("sendChunked");
 166                         timeout = info.GetInt32 ("timeout");
 167                         redirects = info.GetInt32 ("redirects");
 168                         host = info.GetString ("host");
 169                         ResetAuthorization ();
 170                 }
 171
 172                 void ResetAuthorization ()
 173                 {
 174                         auth_state = new AuthorizationState (this, false);
 175                         proxy_auth_state = new AuthorizationState (this, true);
 176                 }
 177
 178                 // Properties
 179
 180                 public string Accept {
 181                         get { return webHeaders ["Accept"]; }
 182                         set {
 183                                 CheckRequestStarted ();
 184                                 webHeaders.RemoveAndAdd ("Accept", value);
 185                         }
 186                 }
 187
 188                 public Uri Address {
 189                         get { return actualUri; }
 190                         internal set { actualUri = value; } // Used by Ftp+proxy
 191                 }
 192
 193                 public bool AllowAutoRedirect {
 194                         get { return allowAutoRedirect; }
 195                         set { this.allowAutoRedirect = value; }
 196                 }
 197
 198                 public bool AllowWriteStreamBuffering {
 199                         get { return allowBuffering; }
 200                         set { allowBuffering = value; }
 201                 }
 202
 203 #if NET_4_5
 204                 public virtual bool AllowReadStreamBuffering {
 205                         get { return false; }
 206                         set {
 207                                 if (value)
 208                                         throw new InvalidOperationException ();
 209                         }
 210                 }
 211 #endif
 212
 213                 static Exception GetMustImplement ()
 214                 {
 215                         return new NotImplementedException ();
 216                 }
 217
 218                 public DecompressionMethods AutomaticDecompression
 219                 {
 220                         get {
 221                                 return auto_decomp;
 222                         }
 223                         set {
 224                                 CheckRequestStarted ();
 225                                 auto_decomp = value;
 226                         }
 227                 }
 228
 229                 internal bool InternalAllowBuffering {
 230                         get {
 231                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 232                                                         method != "MKCOL" && method != "CONNECT" &&
 233                                                         method != "TRACE"));
 234                         }
 235                 }
 236
 237                 public X509CertificateCollection ClientCertificates {
 238                         get {
 239                                 if (certificates == null)
 240                                         certificates = new X509CertificateCollection ();
 241
 242                                 return certificates;
 243                         }
 244                         [MonoTODO]
 245                         set {
 246                                 throw GetMustImplement ();
 247                         }
 248                 }
 249
 250                 public string Connection {
 251                         get { return webHeaders ["Connection"]; }
 252                         set {
 253                                 CheckRequestStarted ();
 254
 255                                 if (string.IsNullOrEmpty (value)) {
 256                                         webHeaders.RemoveInternal ("Connection");
 257                                         return;
 258                                 }
 259
 260                                 string val = value.ToLowerInvariant ();
 261                                 if (val.Contains ("keep-alive") || val.Contains ("close"))
 262                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 263
 264                                 if (keepAlive)
 265                                         value = value + ", Keep-Alive";
 266
 267                                 webHeaders.RemoveAndAdd ("Connection", value);
 268                         }
 269                 }
 270
 271                 public override string ConnectionGroupName {
 272                         get { return connectionGroup; }
 273                         set { connectionGroup = value; }
 274                 }
 275
 276                 public override long ContentLength {
 277                         get { return contentLength; }
 278                         set {
 279                                 CheckRequestStarted ();
 280                                 if (value < 0)
 281                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 282
 283                                 contentLength = value;
 284                                 haveContentLength = true;
 285                         }
 286                 }
 287
 288                 internal long InternalContentLength {
 289                         set { contentLength = value; }
 290                 }
 291
 292                 internal bool ThrowOnError { get; set; }
 293
 294                 public override string ContentType {
 295                         get { return webHeaders ["Content-Type"]; }
 296                         set {
 297                                 if (value == null || value.Trim().Length == 0) {
 298                                         webHeaders.RemoveInternal ("Content-Type");
 299                                         return;
 300                                 }
 301                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 302                         }
 303                 }
 304
 305                 public HttpContinueDelegate ContinueDelegate {
 306                         get { return continueDelegate; }
 307                         set { continueDelegate = value; }
 308                 }
 309
 310 #if NET_4_5
 311                 virtual
 312 #endif
 313                 public CookieContainer CookieContainer {
 314                         get { return cookieContainer; }
 315                         set { cookieContainer = value; }
 316                 }
 317
 318                 public override ICredentials Credentials {
 319                         get { return credentials; }
 320                         set { credentials = value; }
 321                 }
 322                 public DateTime Date {
 323                         get {
 324                                 string date = webHeaders ["Date"];
 325                                 if (date == null)
 326                                         return DateTime.MinValue;
 327                                 return DateTime.ParseExact (date, "r", CultureInfo.InvariantCulture).ToLocalTime ();
 328                         }
 329                         set {
 330                                 if (value.Equals (DateTime.MinValue))
 331                                         webHeaders.RemoveInternal ("Date");
 332                                 else
 333                                         webHeaders.RemoveAndAdd ("Date", value.ToUniversalTime ().ToString ("r", CultureInfo.InvariantCulture));
 334                         }
 335                 }
 336
 337 #if !NET_2_1
 338                 [MonoTODO]
 339                 public static new RequestCachePolicy DefaultCachePolicy
 340                 {
 341                         get {
 342                                 throw GetMustImplement ();
 343                         }
 344                         set {
 345                                 throw GetMustImplement ();
 346                         }
 347                 }
 348 #endif
 349
 350                 [MonoTODO]
 351                 public static int DefaultMaximumErrorResponseLength
 352                 {
 353                         get {
 354                                 throw GetMustImplement ();
 355                         }
 356                         set {
 357                                 throw GetMustImplement ();
 358                         }
 359                 }
 360
 361                 public string Expect {
 362                         get { return webHeaders ["Expect"]; }
 363                         set {
 364                                 CheckRequestStarted ();
 365                                 string val = value;
 366                                 if (val != null)
 367                                         val = val.Trim ().ToLower ();
 368
 369                                 if (val == null || val.Length == 0) {
 370                                         webHeaders.RemoveInternal ("Expect");
 371                                         return;
 372                                 }
 373
 374                                 if (val == "100-continue")
 375                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 376                                                                      "value");
 377                                 webHeaders.RemoveAndAdd ("Expect", value);
 378                         }
 379                 }
 380
 381 #if NET_4_5
 382                 virtual
 383 #endif
 384                 public bool HaveResponse {
 385                         get { return haveResponse; }
 386                 }
 387
 388                 public override WebHeaderCollection Headers {
 389                         get { return webHeaders; }
 390                         set {
 391                                 CheckRequestStarted ();
 392                                 WebHeaderCollection newHeaders = new WebHeaderCollection (WebHeaderCollection.HeaderInfo.Request);
 393                                 int count = value.Count;
 394                                 for (int i = 0; i < count; i++)
 395                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 396
 397                                 webHeaders = newHeaders;
 398                         }
 399                 }
 400
 401                 public
 402                 string Host {
 403                         get {
 404                                 if (host == null)
 405                                         return actualUri.Authority;
 406                                 return host;
 407                         }
 408                         set {
 409                                 if (value == null)
 410                                         throw new ArgumentNullException ("value");
 411
 412                                 if (!CheckValidHost (actualUri.Scheme, value))
 413                                         throw new ArgumentException ("Invalid host: " + value);
 414
 415                                 host = value;
 416                         }
 417                 }
 418
 419                 static bool CheckValidHost (string scheme, string val)
 420                 {
 421                         if (val.Length == 0)
 422                                 return false;
 423
 424                         if (val [0] == '.')
 425                                 return false;
 426
 427                         int idx = val.IndexOf ('/');
 428                         if (idx >= 0)
 429                                 return false;
 430
 431                         IPAddress ipaddr;
 432                         if (IPAddress.TryParse (val, out ipaddr))
 433                                 return true;
 434
 435                         string u = scheme + "://" + val + "/";
 436                         return Uri.IsWellFormedUriString (u, UriKind.Absolute);
 437                 }
 438
 439                 public DateTime IfModifiedSince {
 440                         get {
 441                                 string str = webHeaders ["If-Modified-Since"];
 442                                 if (str == null)
 443                                         return DateTime.Now;
 444                                 try {
 445                                         return MonoHttpDate.Parse (str);
 446                                 } catch (Exception) {
 447                                         return DateTime.Now;
 448                                 }
 449                         }
 450                         set {
 451                                 CheckRequestStarted ();
 452                                 // rfc-1123 pattern
 453                                 webHeaders.SetInternal ("If-Modified-Since",
 454                                         value.ToUniversalTime ().ToString ("r", null));
 455                                 // TODO: check last param when using different locale
 456                         }
 457                 }
 458
 459                 public bool KeepAlive {
 460                         get {
 461                                 return keepAlive;
 462                         }
 463                         set {
 464                                 keepAlive = value;
 465                         }
 466                 }
 467
 468                 public int MaximumAutomaticRedirections {
 469                         get { return maxAutoRedirect; }
 470                         set {
 471                                 if (value <= 0)
 472                                         throw new ArgumentException ("Must be > 0", "value");
 473
 474                                 maxAutoRedirect = value;
 475                         }
 476                 }
 477
 478                 [MonoTODO ("Use this")]
 479                 public int MaximumResponseHeadersLength {
 480                         get { return maxResponseHeadersLength; }
 481                         set { maxResponseHeadersLength = value; }
 482                 }
 483
 484                 [MonoTODO ("Use this")]
 485                 public static int DefaultMaximumResponseHeadersLength {
 486                         get { return defaultMaxResponseHeadersLength; }
 487                         set { defaultMaxResponseHeadersLength = value; }
 488                 }
 489
 490                 public  int ReadWriteTimeout {
 491                         get { return readWriteTimeout; }
 492                         set {
 493                                 if (requestSent)
 494                                         throw new InvalidOperationException ("The request has already been sent.");
 495
 496                                 if (value < -1)
 497                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 498
 499                                 readWriteTimeout = value;
 500                         }
 501                 }
 502
 503 #if NET_4_5
 504                 [MonoTODO]
 505                 public int ContinueTimeout {
 506                         get { throw new NotImplementedException (); }
 507                         set { throw new NotImplementedException (); }
 508                 }
 509 #endif
 510
 511                 public string MediaType {
 512                         get { return mediaType; }
 513                         set {
 514                                 mediaType = value;
 515                         }
 516                 }
 517
 518                 public override string Method {
 519                         get { return this.method; }
 520                         set {
 521                                 if (value == null || value.Trim () == "")
 522                                         throw new ArgumentException ("not a valid method");
 523
 524                                 method = value.ToUpperInvariant ();
 525                                 if (method != "HEAD" && method != "GET" && method != "POST" && method != "PUT" &&
 526                                         method != "DELETE" && method != "CONNECT" && method != "TRACE" &&
 527                                         method != "MKCOL") {
 528                                         method = value;
 529                                 }
 530                         }
 531                 }
 532
 533                 public bool Pipelined {
 534                         get { return pipelined; }
 535                         set { pipelined = value; }
 536                 }
 537
 538                 public override bool PreAuthenticate {
 539                         get { return preAuthenticate; }
 540                         set { preAuthenticate = value; }
 541                 }
 542
 543                 public Version ProtocolVersion {
 544                         get { return version; }
 545                         set {
 546                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 547                                         throw new ArgumentException ("value");
 548
 549                                 force_version = true;
 550                                 version = value;
 551                         }
 552                 }
 553
 554                 public override IWebProxy Proxy {
 555                         get { return proxy; }
 556                         set {
 557                                 CheckRequestStarted ();
 558                                 proxy = value;
 559                                 servicePoint = null; // we may need a new one
 560                         }
 561                 }
 562
 563                 public string Referer {
 564                         get { return webHeaders ["Referer"]; }
 565                         set {
 566                                 CheckRequestStarted ();
 567                                 if (value == null || value.Trim().Length == 0) {
 568                                         webHeaders.RemoveInternal ("Referer");
 569                                         return;
 570                                 }
 571                                 webHeaders.SetInternal ("Referer", value);
 572                         }
 573                 }
 574
 575                 public override Uri RequestUri {
 576                         get { return requestUri; }
 577                 }
 578
 579                 public bool SendChunked {
 580                         get { return sendChunked; }
 581                         set {
 582                                 CheckRequestStarted ();
 583                                 sendChunked = value;
 584                         }
 585                 }
 586
 587                 public ServicePoint ServicePoint {
 588                         get { return GetServicePoint (); }
 589                 }
 590
 591                 internal ServicePoint ServicePointNoLock {
 592                         get { return servicePoint; }
 593                 }
 594                 public virtual bool SupportsCookieContainer {
 595                         get {
 596                                 // The managed implementation supports the cookie container
 597                                 // it is only Silverlight that returns false here
 598                                 return true;
 599                         }
 600                 }
 601                 public override int Timeout {
 602                         get { return timeout; }
 603                         set {
 604                                 if (value < -1)
 605                                         throw new ArgumentOutOfRangeException ("value");
 606
 607                                 timeout = value;
 608                         }
 609                 }
 610
 611                 public string TransferEncoding {
 612                         get { return webHeaders ["Transfer-Encoding"]; }
 613                         set {
 614                                 CheckRequestStarted ();
 615                                 string val = value;
 616                                 if (val != null)
 617                                         val = val.Trim ().ToLower ();
 618
 619                                 if (val == null || val.Length == 0) {
 620                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 621                                         return;
 622                                 }
 623
 624                                 if (val == "chunked")
 625                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 626
 627                                 if (!sendChunked)
 628                                         throw new ArgumentException ("SendChunked must be True", "value");
 629
 630                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 631                         }
 632                 }
 633
 634                 public override bool UseDefaultCredentials
 635                 {
 636                         get { return CredentialCache.DefaultCredentials == Credentials; }
 637                         set { Credentials = value ? CredentialCache.DefaultCredentials : null; }
 638                 }
 639
 640                 public string UserAgent {
 641                         get { return webHeaders ["User-Agent"]; }
 642                         set { webHeaders.SetInternal ("User-Agent", value); }
 643                 }
 644
 645                 bool unsafe_auth_blah;
 646                 public bool UnsafeAuthenticatedConnectionSharing
 647                 {
 648                         get { return unsafe_auth_blah; }
 649                         set { unsafe_auth_blah = value; }
 650                 }
 651
 652                 internal bool GotRequestStream {
 653                         get { return gotRequestStream; }
 654                 }
 655
 656                 internal bool ExpectContinue {
 657                         get { return expectContinue; }
 658                         set { expectContinue = value; }
 659                 }
 660
 661                 internal Uri AuthUri {
 662                         get { return actualUri; }
 663                 }
 664
 665                 internal bool ProxyQuery {
 666                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 667                 }
 668
 669                 // Methods
 670
 671                 internal ServicePoint GetServicePoint ()
 672                 {
 673                         lock (locker) {
 674                                 if (hostChanged || servicePoint == null) {
 675                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 676                                         hostChanged = false;
 677                                 }
 678                         }
 679
 680                         return servicePoint;
 681                 }
 682
 683                 public void AddRange (int range)
 684                 {
 685                         AddRange ("bytes", (long) range);
 686                 }
 687
 688                 public void AddRange (int from, int to)
 689                 {
 690                         AddRange ("bytes", (long) from, (long) to);
 691                 }
 692
 693                 public void AddRange (string rangeSpecifier, int range)
 694                 {
 695                         AddRange (rangeSpecifier, (long) range);
 696                 }
 697
 698                 public void AddRange (string rangeSpecifier, int from, int to)
 699                 {
 700                         AddRange (rangeSpecifier, (long) from, (long) to);
 701                 }
 702                 public
 703                 void AddRange (long range)
 704                 {
 705                         AddRange ("bytes", (long) range);
 706                 }
 707
 708                 public
 709                 void AddRange (long from, long to)
 710                 {
 711                         AddRange ("bytes", from, to);
 712                 }
 713
 714                 public
 715                 void AddRange (string rangeSpecifier, long range)
 716                 {
 717                         if (rangeSpecifier == null)
 718                                 throw new ArgumentNullException ("rangeSpecifier");
 719                         if (!WebHeaderCollection.IsHeaderValue (rangeSpecifier))
 720                                 throw new ArgumentException ("Invalid range specifier", "rangeSpecifier");
 721
 722                         string r = webHeaders ["Range"];
 723                         if (r == null)
 724                                 r = rangeSpecifier + "=";
 725                         else {
 726                                 string old_specifier = r.Substring (0, r.IndexOf ('='));
 727                                 if (String.Compare (old_specifier, rangeSpecifier, StringComparison.OrdinalIgnoreCase) != 0)
 728                                         throw new InvalidOperationException ("A different range specifier is already in use");
 729                                 r += ",";
 730                         }
 731
 732                         string n = range.ToString (CultureInfo.InvariantCulture);
 733                         if (range < 0)
 734                                 r = r + "0" + n;
 735                         else
 736                                 r = r + n + "-";
 737                         webHeaders.RemoveAndAdd ("Range", r);
 738                 }
 739
 740                 public
 741                 void AddRange (string rangeSpecifier, long from, long to)
 742                 {
 743                         if (rangeSpecifier == null)
 744                                 throw new ArgumentNullException ("rangeSpecifier");
 745                         if (!WebHeaderCollection.IsHeaderValue (rangeSpecifier))
 746                                 throw new ArgumentException ("Invalid range specifier", "rangeSpecifier");
 747                         if (from > to || from < 0)
 748                                 throw new ArgumentOutOfRangeException ("from");
 749                         if (to < 0)
 750                                 throw new ArgumentOutOfRangeException ("to");
 751
 752                         string r = webHeaders ["Range"];
 753                         if (r == null)
 754                                 r = rangeSpecifier + "=";
 755                         else
 756                                 r += ",";
 757
 758                         r = String.Format ("{0}{1}-{2}", r, from, to);
 759                         webHeaders.RemoveAndAdd ("Range", r);
 760                 }
 761
 762
 763                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 764                 {
 765                         if (Aborted)
 766                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 767
 768                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 769                                         method == "TRACE");
 770                         if (method == null || !send)
 771                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 772
 773                         if (contentLength == -1 && !sendChunked && !allowBuffering && KeepAlive)
 774                                 throw new ProtocolViolationException ("Content-Length not set");
 775
 776                         string transferEncoding = TransferEncoding;
 777                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 778                                 throw new ProtocolViolationException ("SendChunked should be true.");
 779
 780                         lock (locker)
 781                         {
 782                                 if (getResponseCalled)
 783                                         throw new InvalidOperationException ("The operation cannot be performed once the request has been submitted.");
 784
 785                                 if (asyncWrite != null) {
 786                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 787                                                                 "method while a previous call is still in progress.");
 788                                 }
 789
 790                                 asyncWrite = new WebAsyncResult (this, callback, state);
 791                                 initialMethod = method;
 792                                 if (haveRequest) {
 793                                         if (writeStream != null) {
 794                                                 asyncWrite.SetCompleted (true, writeStream);
 795                                                 asyncWrite.DoCallback ();
 796                                                 return asyncWrite;
 797                                         }
 798                                 }
 799
 800                                 gotRequestStream = true;
 801                                 WebAsyncResult result = asyncWrite;
 802                                 if (!requestSent) {
 803                                         requestSent = true;
 804                                         redirects = 0;
 805                                         servicePoint = GetServicePoint ();
 806                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 807                                 }
 808                                 return result;
 809                         }
 810                 }
 811
 812                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 813                 {
 814                         if (asyncResult == null)
 815                                 throw new ArgumentNullException ("asyncResult");
 816
 817                         WebAsyncResult result = asyncResult as WebAsyncResult;
 818                         if (result == null)
 819                                 throw new ArgumentException ("Invalid IAsyncResult");
 820
 821                         asyncWrite = result;
 822                         result.WaitUntilComplete ();
 823
 824                         Exception e = result.Exception;
 825                         if (e != null)
 826                                 throw e;
 827
 828                         return result.WriteStream;
 829                 }
 830
 831                 public override Stream GetRequestStream()
 832                 {
 833                         IAsyncResult asyncResult = asyncWrite;
 834                         if (asyncResult == null) {
 835                                 asyncResult = BeginGetRequestStream (null, null);
 836                                 asyncWrite = (WebAsyncResult) asyncResult;
 837                         }
 838
 839                         if (!asyncResult.IsCompleted && !asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 840                                 Abort ();
 841                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 842                         }
 843
 844                         return EndGetRequestStream (asyncResult);
 845                 }
 846
 847                 bool CheckIfForceWrite (SimpleAsyncResult result)
 848                 {
 849                         if (writeStream == null || writeStream.RequestWritten || !InternalAllowBuffering)
 850                                 return false;
 851                         if (contentLength < 0 && writeStream.CanWrite == true && writeStream.WriteBufferLength < 0)
 852                                 return false;
 853
 854                         if (contentLength < 0 && writeStream.WriteBufferLength >= 0)
 855                                 InternalContentLength = writeStream.WriteBufferLength;
 856
 857                         // This will write the POST/PUT if the write stream already has the expected
 858                         // amount of bytes in it (ContentLength) (bug #77753) or if the write stream
 859                         // contains data and it has been closed already (xamarin bug #1512).
 860
 861                         if (writeStream.WriteBufferLength == contentLength || (contentLength == -1 && writeStream.CanWrite == false))
 862                                 return writeStream.WriteRequestAsync (result);
 863
 864                         return false;
 865                 }
 866
 867                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 868                 {
 869                         if (Aborted)
 870                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 871
 872                         if (method == null)
 873                                 throw new ProtocolViolationException ("Method is null.");
 874
 875                         string transferEncoding = TransferEncoding;
 876                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 877                                 throw new ProtocolViolationException ("SendChunked should be true.");
 878
 879                         Monitor.Enter (locker);
 880                         getResponseCalled = true;
 881                         if (asyncRead != null && !haveResponse) {
 882                                 Monitor.Exit (locker);
 883                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 884                                                         "method while a previous call is still in progress.");
 885                         }
 886
 887                         asyncRead = new WebAsyncResult (this, callback, state);
 888                         WebAsyncResult aread = asyncRead;
 889                         initialMethod = method;
 890
 891                         SimpleAsyncResult.RunWithLock (locker, CheckIfForceWrite, inner => {
 892                                 var synch = inner.CompletedSynchronously;
 893
 894                                 if (inner.GotException) {
 895                                         aread.SetCompleted (synch, inner.Exception);
 896                                         aread.DoCallback ();
 897                                         return;
 898                                 }
 899
 900                                 if (haveResponse) {
 901                                         Exception saved = saved_exc;
 902                                         if (webResponse != null) {
 903                                                 if (saved == null) {
 904                                                         aread.SetCompleted (synch, webResponse);
 905                                                 } else {
 906                                                         aread.SetCompleted (synch, saved);
 907                                                 }
 908                                                 aread.DoCallback ();
 909                                                 return;
 910                                         } else if (saved != null) {
 911                                                 aread.SetCompleted (synch, saved);
 912                                                 aread.DoCallback ();
 913                                                 return;
 914                                         }
 915                                 }
 916
 917                                 if (!requestSent) {
 918                                         requestSent = true;
 919                                         redirects = 0;
 920                                         servicePoint = GetServicePoint ();
 921                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 922                                 }
 923                         });
 924
 925                         return aread;
 926                 }
 927
 928                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 929                 {
 930                         if (asyncResult == null)
 931                                 throw new ArgumentNullException ("asyncResult");
 932
 933                         WebAsyncResult result = asyncResult as WebAsyncResult;
 934                         if (result == null)
 935                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 936
 937                         if (!result.WaitUntilComplete (timeout, false)) {
 938                                 Abort ();
 939                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 940                         }
 941
 942                         if (result.GotException)
 943                                 throw result.Exception;
 944
 945                         return result.Response;
 946                 }
 947
 948 #if NET_3_5
 949                 public Stream EndGetRequestStream (IAsyncResult asyncResult, out TransportContext transportContext)
 950                 {
 951                         transportContext = null;
 952                         return EndGetRequestStream (asyncResult);
 953                 }
 954 #endif
 955
 956                 public override WebResponse GetResponse()
 957                 {
 958                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 959                         return EndGetResponse (result);
 960                 }
 961
 962                 internal bool FinishedReading {
 963                         get { return finished_reading; }
 964                         set { finished_reading = value; }
 965                 }
 966
 967                 internal bool Aborted {
 968                         get { return Interlocked.CompareExchange (ref aborted, 0, 0) == 1; }
 969                 }
 970
 971                 public override void Abort ()
 972                 {
 973                         if (Interlocked.CompareExchange (ref aborted, 1, 0) == 1)
 974                                 return;
 975
 976                         if (haveResponse && finished_reading)
 977                                 return;
 978
 979                         haveResponse = true;
 980                         if (abortHandler != null) {
 981                                 try {
 982                                         abortHandler (this, EventArgs.Empty);
 983                                 } catch (Exception) {}
 984                                 abortHandler = null;
 985                         }
 986
 987                         if (asyncWrite != null) {
 988                                 WebAsyncResult r = asyncWrite;
 989                                 if (!r.IsCompleted) {
 990                                         try {
 991                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 992                                                 r.SetCompleted (false, wexc);
 993                                                 r.DoCallback ();
 994                                         } catch {}
 995                                 }
 996                                 asyncWrite = null;
 997                         }
 998
 999                         if (asyncRead != null) {
1000                                 WebAsyncResult r = asyncRead;
1001                                 if (!r.IsCompleted) {
1002                                         try {
1003                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
1004                                                 r.SetCompleted (false, wexc);
1005                                                 r.DoCallback ();
1006                                         } catch {}
1007                                 }
1008                                 asyncRead = null;
1009                         }
1010
1011                         if (writeStream != null) {
1012                                 try {
1013                                         writeStream.Close ();
1014                                         writeStream = null;
1015                                 } catch {}
1016                         }
1017
1018                         if (webResponse != null) {
1019                                 try {
1020                                         webResponse.Close ();
1021                                         webResponse = null;
1022                                 } catch {}
1023                         }
1024                 }
1025
1026                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
1027                                                   StreamingContext streamingContext)
1028                 {
1029                         GetObjectData (serializationInfo, streamingContext);
1030                 }
1031
1032                 protected override void GetObjectData (SerializationInfo serializationInfo,
1033                         StreamingContext streamingContext)
1034                 {
1035                         SerializationInfo info = serializationInfo;
1036
1037                         info.AddValue ("requestUri", requestUri, typeof (Uri));
1038                         info.AddValue ("actualUri", actualUri, typeof (Uri));
1039                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
1040                         info.AddValue ("allowBuffering", allowBuffering);
1041                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
1042                         info.AddValue ("connectionGroup", connectionGroup);
1043                         info.AddValue ("contentLength", contentLength);
1044                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
1045                         info.AddValue ("keepAlive", keepAlive);
1046                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
1047                         info.AddValue ("mediaType", mediaType);
1048                         info.AddValue ("method", method);
1049                         info.AddValue ("initialMethod", initialMethod);
1050                         info.AddValue ("pipelined", pipelined);
1051                         info.AddValue ("version", version, typeof (Version));
1052                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
1053                         info.AddValue ("sendChunked", sendChunked);
1054                         info.AddValue ("timeout", timeout);
1055                         info.AddValue ("redirects", redirects);
1056                         info.AddValue ("host", host);
1057                 }
1058
1059                 void CheckRequestStarted ()
1060                 {
1061                         if (requestSent)
1062                                 throw new InvalidOperationException ("request started");
1063                 }
1064
1065                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
1066                 {
1067                         if (continueDelegate != null)
1068                                 continueDelegate (statusCode, headers);
1069                 }
1070
1071                 void RewriteRedirectToGet ()
1072                 {
1073                         method = "GET";
1074                         webHeaders.RemoveInternal ("Transfer-Encoding");
1075                         sendChunked = false;
1076                 }
1077
1078                 bool Redirect (WebAsyncResult result, HttpStatusCode code, WebResponse response)
1079                 {
1080                         redirects++;
1081                         Exception e = null;
1082                         string uriString = null;
1083                         switch (code) {
1084                         case HttpStatusCode.Ambiguous: // 300
1085                                 e = new WebException ("Ambiguous redirect.");
1086                                 break;
1087                         case HttpStatusCode.MovedPermanently: // 301
1088                         case HttpStatusCode.Redirect: // 302
1089                                 if (method == "POST")
1090                                         RewriteRedirectToGet ();
1091                                 break;
1092                         case HttpStatusCode.TemporaryRedirect: // 307
1093                                 break;
1094                         case HttpStatusCode.SeeOther: //303
1095                                 RewriteRedirectToGet ();
1096                                 break;
1097                         case HttpStatusCode.NotModified: // 304
1098                                 return false;
1099                         case HttpStatusCode.UseProxy: // 305
1100                                 e = new NotImplementedException ("Proxy support not available.");
1101                                 break;
1102                         case HttpStatusCode.Unused: // 306
1103                         default:
1104                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
1105                                 break;
1106                         }
1107
1108                         if (method != "GET" && !InternalAllowBuffering)
1109                                 e = new WebException ("The request requires buffering data to succeed.", null, WebExceptionStatus.ProtocolError, webResponse);
1110
1111                         if (e != null)
1112                                 throw e;
1113
1114                         contentLength = -1;
1115                         uriString = webResponse.Headers ["Location"];
1116
1117                         if (uriString == null)
1118                                 throw new WebException ("No Location header found for " + (int) code,
1119                                                         WebExceptionStatus.ProtocolError);
1120
1121                         Uri prev = actualUri;
1122                         try {
1123                                 actualUri = new Uri (actualUri, uriString);
1124                         } catch (Exception) {
1125                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
1126                                                                         uriString, (int) code),
1127                                                                         WebExceptionStatus.ProtocolError);
1128                         }
1129
1130                         hostChanged = (actualUri.Scheme != prev.Scheme || Host != prev.Authority);
1131                         return true;
1132                 }
1133
1134                 string GetHeaders ()
1135                 {
1136                         bool continue100 = false;
1137                         if (sendChunked) {
1138                                 continue100 = true;
1139                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
1140                                 webHeaders.RemoveInternal ("Content-Length");
1141                         } else if (contentLength != -1) {
1142                                 if (auth_state.NtlmAuthState == NtlmAuthState.Challenge || proxy_auth_state.NtlmAuthState == NtlmAuthState.Challenge) {
1143                                         // We don't send any body with the NTLM Challenge request.
1144                                         if (haveContentLength || gotRequestStream || contentLength > 0)
1145                                                 webHeaders.SetInternal ("Content-Length", "0");
1146                                         else
1147                                                 webHeaders.RemoveInternal ("Content-Length");
1148                                 } else {
1149                                         if (contentLength > 0)
1150                                                 continue100 = true;
1151
1152                                         if (haveContentLength || gotRequestStream || contentLength > 0)
1153                                                 webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
1154                                 }
1155                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1156                         } else {
1157                                 webHeaders.RemoveInternal ("Content-Length");
1158                         }
1159
1160                         if (actualVersion == HttpVersion.Version11 && continue100 &&
1161                             servicePoint.SendContinue) { // RFC2616 8.2.3
1162                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
1163                                 expectContinue = true;
1164                         } else {
1165                                 webHeaders.RemoveInternal ("Expect");
1166                                 expectContinue = false;
1167                         }
1168
1169                         bool proxy_query = ProxyQuery;
1170                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
1171                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
1172                         Version proto_version = servicePoint.ProtocolVersion;
1173                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
1174
1175                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
1176                                 if (webHeaders[connectionHeader] == null
1177                                     || webHeaders[connectionHeader].IndexOf ("keep-alive", StringComparison.OrdinalIgnoreCase) == -1)
1178                                         webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
1179                         } else if (!keepAlive && version == HttpVersion.Version11) {
1180                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
1181                         }
1182
1183                         webHeaders.SetInternal ("Host", Host);
1184                         if (cookieContainer != null) {
1185                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
1186                                 if (cookieHeader != "")
1187                                         webHeaders.RemoveAndAdd ("Cookie", cookieHeader);
1188                                 else
1189                                         webHeaders.RemoveInternal ("Cookie");
1190                         }
1191
1192                         string accept_encoding = null;
1193                         if ((auto_decomp & DecompressionMethods.GZip) != 0)
1194                                 accept_encoding = "gzip";
1195                         if ((auto_decomp & DecompressionMethods.Deflate) != 0)
1196                                 accept_encoding = accept_encoding != null ? "gzip, deflate" : "deflate";
1197                         if (accept_encoding != null)
1198                                 webHeaders.RemoveAndAdd ("Accept-Encoding", accept_encoding);
1199
1200                         if (!usedPreAuth && preAuthenticate)
1201                                 DoPreAuthenticate ();
1202
1203                         return webHeaders.ToString ();
1204                 }
1205
1206                 void DoPreAuthenticate ()
1207                 {
1208                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1209                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1210                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1211                         if (auth == null)
1212                                 return;
1213
1214                         webHeaders.RemoveInternal ("Proxy-Authorization");
1215                         webHeaders.RemoveInternal ("Authorization");
1216                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1217                         webHeaders [authHeader] = auth.Message;
1218                         usedPreAuth = true;
1219                 }
1220
1221                 internal void SetWriteStreamError (WebExceptionStatus status, Exception exc)
1222                 {
1223                         if (Aborted)
1224                                 return;
1225
1226                         WebAsyncResult r = asyncWrite;
1227                         if (r == null)
1228                                 r = asyncRead;
1229
1230                         if (r != null) {
1231                                 string msg;
1232                                 WebException wex;
1233                                 if (exc == null) {
1234                                         msg = "Error: " + status;
1235                                         wex = new WebException (msg, status);
1236                                 } else {
1237                                         msg = String.Format ("Error: {0} ({1})", status, exc.Message);
1238                                         wex = new WebException (msg, exc, status);
1239                                 }
1240                                 r.SetCompleted (false, wex);
1241                                 r.DoCallback ();
1242                         }
1243                 }
1244
1245                 internal byte[] GetRequestHeaders ()
1246                 {
1247                         StringBuilder req = new StringBuilder ();
1248                         string query;
1249                         if (!ProxyQuery) {
1250                                 query = actualUri.PathAndQuery;
1251                         } else {
1252                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1253                                                                         Host,
1254                                                                         actualUri.PathAndQuery);
1255                         }
1256
1257                         if (!force_version && servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1258                                 actualVersion = servicePoint.ProtocolVersion;
1259                         } else {
1260                                 actualVersion = version;
1261                         }
1262
1263                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1264                                                                 actualVersion.Major, actualVersion.Minor);
1265                         req.Append (GetHeaders ());
1266                         string reqstr = req.ToString ();
1267                         return Encoding.UTF8.GetBytes (reqstr);
1268                 }
1269
1270                 internal void SetWriteStream (WebConnectionStream stream)
1271                 {
1272                         if (Aborted)
1273                                 return;
1274
1275                         writeStream = stream;
1276                         if (bodyBuffer != null) {
1277                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1278                                 contentLength = bodyBufferLength;
1279                                 writeStream.SendChunked = false;
1280                         }
1281
1282                         writeStream.SetHeadersAsync (false, result => {
1283                                 if (result.GotException) {
1284                                         SetWriteStreamError (result.Exception);
1285                                         return;
1286                                 }
1287
1288                                 haveRequest = true;
1289
1290                                 SetWriteStreamInner (inner => {
1291                                         if (inner.GotException) {
1292                                                 SetWriteStreamError (inner.Exception);
1293                                                 return;
1294                                         }
1295
1296                                         if (asyncWrite != null) {
1297                                                 asyncWrite.SetCompleted (inner.CompletedSynchronously, writeStream);
1298                                                 asyncWrite.DoCallback ();
1299                                                 asyncWrite = null;
1300                                         }
1301                                 });
1302                         });
1303                 }
1304
1305                 void SetWriteStreamInner (SimpleAsyncCallback callback)
1306                 {
1307                         SimpleAsyncResult.Run (result => {
1308                                 if (bodyBuffer != null) {
1309                                         // The body has been written and buffered. The request "user"
1310                                         // won't write it again, so we must do it.
1311                                         if (auth_state.NtlmAuthState != NtlmAuthState.Challenge && proxy_auth_state.NtlmAuthState != NtlmAuthState.Challenge) {
1312                                                 // FIXME: this is a blocking call on the thread pool that could lead to thread pool exhaustion
1313                                                 writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1314                                                 bodyBuffer = null;
1315                                                 writeStream.Close ();
1316                                         }
1317                                 } else if (method != "HEAD" && method != "GET" && method != "MKCOL" && method != "CONNECT" &&
1318                                           method != "TRACE") {
1319                                         if (getResponseCalled && !writeStream.RequestWritten)
1320                                                 return writeStream.WriteRequestAsync (result);
1321                                 }
1322
1323                                 return false;
1324                         }, callback);
1325                 }
1326
1327                 void SetWriteStreamError (Exception exc)
1328                 {
1329                         WebException wexc = exc as WebException;
1330                         if (wexc != null)
1331                                 SetWriteStreamError (wexc.Status, wexc);
1332                         else
1333                                 SetWriteStreamError (WebExceptionStatus.SendFailure, exc);
1334                 }
1335
1336                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1337                 {
1338                         if (Aborted)
1339                                 return;
1340                         lock (locker) {
1341                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1342                         WebAsyncResult r = asyncRead;
1343                         if (r == null)
1344                                 r = asyncWrite;
1345
1346                         WebException wexc;
1347                         if (e is WebException) {
1348                                 wexc = (WebException) e;
1349                         } else {
1350                                 wexc = new WebException (msg, e, status, null);
1351                         }
1352                         if (r != null) {
1353                                 if (!r.IsCompleted) {
1354                                         r.SetCompleted (false, wexc);
1355                                         r.DoCallback ();
1356                                 } else if (r == asyncWrite) {
1357                                         saved_exc = wexc;
1358                                 }
1359                                 haveResponse = true;
1360                                 asyncRead = null;
1361                                 asyncWrite = null;
1362                         } else {
1363                                 haveResponse = true;
1364                                 saved_exc = wexc;
1365                         }
1366                         }
1367                 }
1368
1369                 void CheckSendError (WebConnectionData data)
1370                 {
1371                         // Got here, but no one called GetResponse
1372                         int status = data.StatusCode;
1373                         if (status < 400 || status == 401 || status == 407)
1374                                 return;
1375
1376                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1377                                 // The request has not been completely sent and we got here!
1378                                 // We should probably just close and cause an error in any case,
1379                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1380                                 if (allowBuffering || sendChunked || writeStream.totalWritten >= contentLength) {
1381                                         webResponse.ReadAll ();
1382                                 } else {
1383                                         writeStream.IgnoreIOErrors = true;
1384                                 }
1385                         }
1386                 }
1387
1388                 bool HandleNtlmAuth (WebAsyncResult r)
1389                 {
1390                         bool isProxy = webResponse.StatusCode == HttpStatusCode.ProxyAuthenticationRequired;
1391                         if ((isProxy ? proxy_auth_state.NtlmAuthState : auth_state.NtlmAuthState) == NtlmAuthState.None)
1392                                 return false;
1393
1394                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1395                         if (wce != null) {
1396                                 WebConnection cnc = wce.Connection;
1397                                 cnc.PriorityRequest = this;
1398                                 ICredentials creds = !isProxy ? credentials : proxy.Credentials;
1399                                 if (creds != null) {
1400                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1401                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1402                                 }
1403                         }
1404                         r.Reset ();
1405                         finished_reading = false;
1406                         haveResponse = false;
1407                         webResponse.ReadAll ();
1408                         webResponse = null;
1409                         return true;
1410                 }
1411
1412                 internal void SetResponseData (WebConnectionData data)
1413                 {
1414                         lock (locker) {
1415                         if (Aborted) {
1416                                 if (data.stream != null)
1417                                         data.stream.Close ();
1418                                 return;
1419                         }
1420
1421                         WebException wexc = null;
1422                         try {
1423                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1424                         } catch (Exception e) {
1425                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1426                                 if (data.stream != null)
1427                                         data.stream.Close ();
1428                         }
1429
1430                         if (wexc == null && (method == "POST" || method == "PUT")) {
1431                                 CheckSendError (data);
1432                                 if (saved_exc != null)
1433                                         wexc = (WebException) saved_exc;
1434                         }
1435
1436                         WebAsyncResult r = asyncRead;
1437
1438                         bool forced = false;
1439                         if (r == null && webResponse != null) {
1440                                 // This is a forced completion (302, 204)...
1441                                 forced = true;
1442                                 r = new WebAsyncResult (null, null);
1443                                 r.SetCompleted (false, webResponse);
1444                         }
1445
1446                         if (r != null) {
1447                                 if (wexc != null) {
1448                                         haveResponse = true;
1449                                         if (!r.IsCompleted)
1450                                                 r.SetCompleted (false, wexc);
1451                                         r.DoCallback ();
1452                                         return;
1453                                 }
1454
1455                                 bool isProxy = ProxyQuery && !proxy.IsBypassed (actualUri);
1456
1457                                 bool redirected;
1458                                 try {
1459                                         redirected = CheckFinalStatus (r);
1460                                         if (!redirected) {
1461                                                 if ((isProxy ? proxy_auth_state.IsNtlmAuthenticated : auth_state.IsNtlmAuthenticated) &&
1462                                                                 webResponse != null && (int)webResponse.StatusCode < 400) {
1463                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1464                                                         if (wce != null) {
1465                                                                 WebConnection cnc = wce.Connection;
1466                                                                 cnc.NtlmAuthenticated = true;
1467                                                         }
1468                                                 }
1469
1470                                                 // clear internal buffer so that it does not
1471                                                 // hold possible big buffer (bug #397627)
1472                                                 if (writeStream != null)
1473                                                         writeStream.KillBuffer ();
1474
1475                                                 haveResponse = true;
1476                                                 r.SetCompleted (false, webResponse);
1477                                                 r.DoCallback ();
1478                                         } else {
1479                                                 if (sendChunked) {
1480                                                         sendChunked = false;
1481                                                         webHeaders.RemoveInternal ("Transfer-Encoding");
1482                                                 }
1483
1484                                                 if (webResponse != null) {
1485                                                         if (HandleNtlmAuth (r))
1486                                                                 return;
1487                                                         webResponse.Close ();
1488                                                 }
1489                                                 finished_reading = false;
1490                                                 haveResponse = false;
1491                                                 webResponse = null;
1492                                                 r.Reset ();
1493                                                 servicePoint = GetServicePoint ();
1494                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1495                                         }
1496                                 } catch (WebException wexc2) {
1497                                         if (forced) {
1498                                                 saved_exc = wexc2;
1499                                                 haveResponse = true;
1500                                         }
1501                                         r.SetCompleted (false, wexc2);
1502                                         r.DoCallback ();
1503                                         return;
1504                                 } catch (Exception ex) {
1505                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1506                                         if (forced) {
1507                                                 saved_exc = wexc;
1508                                                 haveResponse = true;
1509                                         }
1510                                         r.SetCompleted (false, wexc);
1511                                         r.DoCallback ();
1512                                         return;
1513                                 }
1514                         }
1515                         }
1516                 }
1517
1518                 struct AuthorizationState
1519                 {
1520                         readonly HttpWebRequest request;
1521                         readonly bool isProxy;
1522                         bool isCompleted;
1523                         NtlmAuthState ntlm_auth_state;
1524
1525                         public bool IsCompleted {
1526                                 get { return isCompleted; }
1527                         }
1528
1529                         public NtlmAuthState NtlmAuthState {
1530                                 get { return ntlm_auth_state; }
1531                         }
1532
1533                         public bool IsNtlmAuthenticated {
1534                                 get { return isCompleted && ntlm_auth_state != NtlmAuthState.None; }
1535                         }
1536
1537                         public AuthorizationState (HttpWebRequest request, bool isProxy)
1538                         {
1539                                 this.request = request;
1540                                 this.isProxy = isProxy;
1541                                 isCompleted = false;
1542                                 ntlm_auth_state = NtlmAuthState.None;
1543                         }
1544
1545                         public bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1546                         {
1547                                 isCompleted = false;
1548                                 if (code == HttpStatusCode.Unauthorized && request.credentials == null)
1549                                         return false;
1550
1551                                 // FIXME: This should never happen!
1552                                 if (isProxy != (code == HttpStatusCode.ProxyAuthenticationRequired))
1553                                         return false;
1554
1555                                 if (isProxy && (request.proxy == null || request.proxy.Credentials == null))
1556                                         return false;
1557
1558                                 string [] authHeaders = response.Headers.GetValues_internal (isProxy ? "Proxy-Authenticate" : "WWW-Authenticate", false);
1559                                 if (authHeaders == null || authHeaders.Length == 0)
1560                                         return false;
1561
1562                                 ICredentials creds = (!isProxy) ? request.credentials : request.proxy.Credentials;
1563                                 Authorization auth = null;
1564                                 foreach (string authHeader in authHeaders) {
1565                                         auth = AuthenticationManager.Authenticate (authHeader, request, creds);
1566                                         if (auth != null)
1567                                                 break;
1568                                 }
1569                                 if (auth == null)
1570                                         return false;
1571                                 request.webHeaders [isProxy ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1572                                 isCompleted = auth.Complete;
1573                                 bool is_ntlm = (auth.Module.AuthenticationType == "NTLM");
1574                                 if (is_ntlm)
1575                                         ntlm_auth_state = (NtlmAuthState)((int) ntlm_auth_state + 1);
1576                                 return true;
1577                         }
1578
1579                         public void Reset ()
1580                         {
1581                                 isCompleted = false;
1582                                 ntlm_auth_state = NtlmAuthState.None;
1583                                 request.webHeaders.RemoveInternal (isProxy ? "Proxy-Authorization" : "Authorization");
1584                         }
1585
1586                         public override string ToString ()
1587                         {
1588                                 return string.Format ("{0}AuthState [{1}:{2}]", isProxy ? "Proxy" : "", isCompleted, ntlm_auth_state);
1589                         }
1590                 }
1591
1592                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1593                 {
1594                         bool isProxy = code == HttpStatusCode.ProxyAuthenticationRequired;
1595                         return isProxy ? proxy_auth_state.CheckAuthorization (response, code) : auth_state.CheckAuthorization (response, code);
1596                 }
1597
1598                 // Returns true if redirected
1599                 bool CheckFinalStatus (WebAsyncResult result)
1600                 {
1601                         if (result.GotException) {
1602                                 bodyBuffer = null;
1603                                 throw result.Exception;
1604                         }
1605
1606                         Exception throwMe = result.Exception;
1607
1608                         HttpWebResponse resp = result.Response;
1609                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1610                         HttpStatusCode code = 0;
1611                         if (throwMe == null && webResponse != null) {
1612                                 code = webResponse.StatusCode;
1613                                 if ((!auth_state.IsCompleted && code == HttpStatusCode.Unauthorized && credentials != null) ||
1614                                         (ProxyQuery && !proxy_auth_state.IsCompleted && code == HttpStatusCode.ProxyAuthenticationRequired)) {
1615                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1616                                                 // Keep the written body, so it can be rewritten in the retry
1617                                                 if (InternalAllowBuffering) {
1618                                                         if (writeStream.WriteBufferLength > 0) {
1619                                                                 bodyBuffer = writeStream.WriteBuffer;
1620                                                                 bodyBufferLength = writeStream.WriteBufferLength;
1621                                                         }
1622                                                         return true;
1623                                                 } else if (method != "PUT" && method != "POST") {
1624                                                         bodyBuffer = null;
1625                                                         return true;
1626                                                 }
1627
1628                                                 if (!ThrowOnError)
1629                                                         return false;
1630
1631                                                 writeStream.InternalClose ();
1632                                                 writeStream = null;
1633                                                 webResponse.Close ();
1634                                                 webResponse = null;
1635                                                 bodyBuffer = null;
1636
1637                                                 throw new WebException ("This request requires buffering " +
1638                                                                         "of data for authentication or " +
1639                                                                         "redirection to be sucessful.");
1640                                         }
1641                                 }
1642
1643                                 bodyBuffer = null;
1644                                 if ((int) code >= 400) {
1645                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1646                                                                     (int) code, webResponse.StatusDescription);
1647                                         throwMe = new WebException (err, null, protoError, webResponse);
1648                                         webResponse.ReadAll ();
1649                                 } else if ((int) code == 304 && allowAutoRedirect) {
1650                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1651                                                                     (int) code, webResponse.StatusDescription);
1652                                         throwMe = new WebException (err, null, protoError, webResponse);
1653                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1654                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1655                                                                     protoError, webResponse);
1656                                         webResponse.ReadAll ();
1657                                 }
1658                         }
1659
1660                         bodyBuffer = null;
1661                         if (throwMe == null) {
1662                                 bool b = false;
1663                                 int c = (int) code;
1664                                 if (allowAutoRedirect && c >= 300) {
1665                                         b = Redirect (result, code, webResponse);
1666                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1667                                                 bodyBuffer = writeStream.WriteBuffer;
1668                                                 bodyBufferLength = writeStream.WriteBufferLength;
1669                                         }
1670                                         if (b && !unsafe_auth_blah) {
1671                                                 auth_state.Reset ();
1672                                                 proxy_auth_state.Reset ();
1673                                         }
1674                                 }
1675
1676                                 if (resp != null && c >= 300 && c != 304)
1677                                         resp.ReadAll ();
1678
1679                                 return b;
1680                         }
1681
1682                         if (!ThrowOnError)
1683                                 return false;
1684
1685                         if (writeStream != null) {
1686                                 writeStream.InternalClose ();
1687                                 writeStream = null;
1688                         }
1689
1690                         webResponse = null;
1691
1692                         throw throwMe;
1693                 }
1694
1695                 internal bool ReuseConnection {
1696                         get;
1697                         set;
1698                 }
1699
1700                 internal WebConnection StoredConnection;
1701         }
1702 }
1703