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