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.Cache;
  40 using System.Net.Sockets;
  41 using System.Runtime.Remoting.Messaging;
  42 using System.Runtime.Serialization;
  43 using System.Security.Cryptography.X509Certificates;
  44 using System.Text;
  45 using System.Threading;
  46
  47 namespace System.Net
  48 {
  49         [Serializable]
  50         public class HttpWebRequest : WebRequest, ISerializable {
  51                 Uri requestUri;
  52                 Uri actualUri;
  53                 bool hostChanged;
  54                 bool allowAutoRedirect = true;
  55                 bool allowBuffering = true;
  56                 X509CertificateCollection certificates;
  57                 string connectionGroup;
  58                 long contentLength = -1;
  59                 HttpContinueDelegate continueDelegate;
  60                 CookieContainer cookieContainer;
  61                 ICredentials credentials;
  62                 bool haveResponse;
  63                 bool haveRequest;
  64                 bool requestSent;
  65                 WebHeaderCollection webHeaders;
  66                 bool keepAlive = true;
  67                 int maxAutoRedirect = 50;
  68                 string mediaType = String.Empty;
  69                 string method = "GET";
  70                 string initialMethod = "GET";
  71                 bool pipelined = true;
  72                 bool preAuthenticate;
  73                 bool usedPreAuth;
  74                 Version version = HttpVersion.Version11;
  75                 bool force_version;
  76                 Version actualVersion;
  77                 IWebProxy proxy;
  78                 bool sendChunked;
  79                 ServicePoint servicePoint;
  80                 int timeout = 100000;
  81
  82                 WebConnectionStream writeStream;
  83                 HttpWebResponse webResponse;
  84                 WebAsyncResult asyncWrite;
  85                 WebAsyncResult asyncRead;
  86                 EventHandler abortHandler;
  87                 int aborted;
  88                 bool gotRequestStream;
  89                 int redirects;
  90                 bool expectContinue;
  91                 bool authCompleted;
  92                 byte[] bodyBuffer;
  93                 int bodyBufferLength;
  94                 bool getResponseCalled;
  95                 Exception saved_exc;
  96                 object locker = new object ();
  97                 bool finished_reading;
  98                 internal WebConnection WebConnection;
  99                 DecompressionMethods auto_decomp;
 100                 int maxResponseHeadersLength;
 101                 static int defaultMaxResponseHeadersLength;
 102                 int readWriteTimeout = 300000; // ms
 103
 104                 enum NtlmAuthState {
 105                         None,
 106                         Challenge,
 107                         Response
 108                 }
 109                 NtlmAuthState ntlm_auth_state;
 110                 string host;
 111
 112                 // Constructors
 113                 static HttpWebRequest ()
 114                 {
 115                         defaultMaxResponseHeadersLength = 64 * 1024;
 116 #if !NET_2_1
 117                         NetConfig config = ConfigurationSettings.GetConfig ("system.net/settings") as NetConfig;
 118                         if (config != null) {
 119                                 int x = config.MaxResponseHeadersLength;
 120                                 if (x != -1)
 121                                         x *= 64;
 122
 123                                 defaultMaxResponseHeadersLength = x;
 124                         }
 125 #endif
 126                 }
 127
 128 #if NET_2_1
 129                 public
 130 #else
 131                 internal
 132 #endif
 133                 HttpWebRequest (Uri uri)
 134                 {
 135                         this.requestUri = uri;
 136                         this.actualUri = uri;
 137                         this.proxy = GlobalProxySelection.Select;
 138                         this.webHeaders = new WebHeaderCollection (WebHeaderCollection.HeaderInfo.Request);
 139                         ThrowOnError = true;
 140                 }
 141
 142                 [Obsolete ("Serialization is obsoleted for this type", false)]
 143                 protected HttpWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
 144                 {
 145                         SerializationInfo info = serializationInfo;
 146
 147                         requestUri = (Uri) info.GetValue ("requestUri", typeof (Uri));
 148                         actualUri = (Uri) info.GetValue ("actualUri", typeof (Uri));
 149                         allowAutoRedirect = info.GetBoolean ("allowAutoRedirect");
 150                         allowBuffering = info.GetBoolean ("allowBuffering");
 151                         certificates = (X509CertificateCollection) info.GetValue ("certificates", typeof (X509CertificateCollection));
 152                         connectionGroup = info.GetString ("connectionGroup");
 153                         contentLength = info.GetInt64 ("contentLength");
 154                         webHeaders = (WebHeaderCollection) info.GetValue ("webHeaders", typeof (WebHeaderCollection));
 155                         keepAlive = info.GetBoolean ("keepAlive");
 156                         maxAutoRedirect = info.GetInt32 ("maxAutoRedirect");
 157                         mediaType = info.GetString ("mediaType");
 158                         method = info.GetString ("method");
 159                         initialMethod = info.GetString ("initialMethod");
 160                         pipelined = info.GetBoolean ("pipelined");
 161                         version = (Version) info.GetValue ("version", typeof (Version));
 162                         proxy = (IWebProxy) info.GetValue ("proxy", typeof (IWebProxy));
 163                         sendChunked = info.GetBoolean ("sendChunked");
 164                         timeout = info.GetInt32 ("timeout");
 165                         redirects = info.GetInt32 ("redirects");
 166                         host = info.GetString ("host");
 167                 }
 168
 169                 // Properties
 170
 171                 public string Accept {
 172                         get { return webHeaders ["Accept"]; }
 173                         set {
 174                                 CheckRequestStarted ();
 175                                 webHeaders.RemoveAndAdd ("Accept", value);
 176                         }
 177                 }
 178
 179                 public Uri Address {
 180                         get { return actualUri; }
 181                         internal set { actualUri = value; } // Used by Ftp+proxy
 182                 }
 183
 184                 public bool AllowAutoRedirect {
 185                         get { return allowAutoRedirect; }
 186                         set { this.allowAutoRedirect = value; }
 187                 }
 188
 189                 public bool AllowWriteStreamBuffering {
 190                         get { return allowBuffering; }
 191                         set { allowBuffering = value; }
 192                 }
 193
 194 #if NET_4_5
 195                 public virtual bool AllowReadStreamBuffering {
 196                         get { return allowBuffering; }
 197                         set { allowBuffering = value; }
 198                 }
 199 #endif
 200
 201                 static Exception GetMustImplement ()
 202                 {
 203                         return new NotImplementedException ();
 204                 }
 205
 206                 public DecompressionMethods AutomaticDecompression
 207                 {
 208                         get {
 209                                 return auto_decomp;
 210                         }
 211                         set {
 212                                 CheckRequestStarted ();
 213                                 auto_decomp = value;
 214                         }
 215                 }
 216
 217                 internal bool InternalAllowBuffering {
 218                         get {
 219                                 return (allowBuffering && (method != "HEAD" && method != "GET" &&
 220                                                         method != "MKCOL" && method != "CONNECT" &&
 221                                                         method != "TRACE"));
 222                         }
 223                 }
 224
 225                 public X509CertificateCollection ClientCertificates {
 226                         get {
 227                                 if (certificates == null)
 228                                         certificates = new X509CertificateCollection ();
 229
 230                                 return certificates;
 231                         }
 232                         [MonoTODO]
 233                         set {
 234                                 throw GetMustImplement ();
 235                         }
 236                 }
 237
 238                 public string Connection {
 239                         get { return webHeaders ["Connection"]; }
 240                         set {
 241                                 CheckRequestStarted ();
 242
 243                                 if (string.IsNullOrEmpty (value)) {
 244                                         webHeaders.RemoveInternal ("Connection");
 245                                         return;
 246                                 }
 247
 248                                 string val = value.ToLowerInvariant ();
 249                                 if (val.Contains ("keep-alive") || val.Contains ("close"))
 250                                         throw new ArgumentException ("Keep-Alive and Close may not be set with this property");
 251
 252                                 if (keepAlive)
 253                                         value = value + ", Keep-Alive";
 254
 255                                 webHeaders.RemoveAndAdd ("Connection", value);
 256                         }
 257                 }
 258
 259                 public override string ConnectionGroupName {
 260                         get { return connectionGroup; }
 261                         set { connectionGroup = value; }
 262                 }
 263
 264                 public override long ContentLength {
 265                         get { return contentLength; }
 266                         set {
 267                                 CheckRequestStarted ();
 268                                 if (value < 0)
 269                                         throw new ArgumentOutOfRangeException ("value", "Content-Length must be >= 0");
 270
 271                                 contentLength = value;
 272                         }
 273                 }
 274
 275                 internal long InternalContentLength {
 276                         set { contentLength = value; }
 277                 }
 278
 279                 internal bool ThrowOnError { get; set; }
 280
 281                 public override string ContentType {
 282                         get { return webHeaders ["Content-Type"]; }
 283                         set {
 284                                 if (value == null || value.Trim().Length == 0) {
 285                                         webHeaders.RemoveInternal ("Content-Type");
 286                                         return;
 287                                 }
 288                                 webHeaders.RemoveAndAdd ("Content-Type", value);
 289                         }
 290                 }
 291
 292                 public HttpContinueDelegate ContinueDelegate {
 293                         get { return continueDelegate; }
 294                         set { continueDelegate = value; }
 295                 }
 296
 297 #if NET_4_5
 298                 virtual
 299 #endif
 300                 public CookieContainer CookieContainer {
 301                         get { return cookieContainer; }
 302                         set { cookieContainer = value; }
 303                 }
 304
 305                 public override ICredentials Credentials {
 306                         get { return credentials; }
 307                         set { credentials = value; }
 308                 }
 309 #if NET_4_0
 310                 public DateTime Date {
 311                         get {
 312                                 string date = webHeaders ["Date"];
 313                                 if (date == null)
 314                                         return DateTime.MinValue;
 315                                 return DateTime.ParseExact (date, "r", CultureInfo.InvariantCulture).ToLocalTime ();
 316                         }
 317                         set {
 318                                 if (value.Equals (DateTime.MinValue))
 319                                         webHeaders.RemoveInternal ("Date");
 320                                 else
 321                                         webHeaders.RemoveAndAdd ("Date", value.ToUniversalTime ().ToString ("r", CultureInfo.InvariantCulture));
 322                         }
 323                 }
 324 #endif
 325
 326 #if !NET_2_1
 327                 [MonoTODO]
 328                 public static new RequestCachePolicy DefaultCachePolicy
 329                 {
 330                         get {
 331                                 throw GetMustImplement ();
 332                         }
 333                         set {
 334                                 throw GetMustImplement ();
 335                         }
 336                 }
 337 #endif
 338
 339                 [MonoTODO]
 340                 public static int DefaultMaximumErrorResponseLength
 341                 {
 342                         get {
 343                                 throw GetMustImplement ();
 344                         }
 345                         set {
 346                                 throw GetMustImplement ();
 347                         }
 348                 }
 349
 350                 public string Expect {
 351                         get { return webHeaders ["Expect"]; }
 352                         set {
 353                                 CheckRequestStarted ();
 354                                 string val = value;
 355                                 if (val != null)
 356                                         val = val.Trim ().ToLower ();
 357
 358                                 if (val == null || val.Length == 0) {
 359                                         webHeaders.RemoveInternal ("Expect");
 360                                         return;
 361                                 }
 362
 363                                 if (val == "100-continue")
 364                                         throw new ArgumentException ("100-Continue cannot be set with this property.",
 365                                                                      "value");
 366                                 webHeaders.RemoveAndAdd ("Expect", value);
 367                         }
 368                 }
 369
 370 #if NET_4_5
 371                 virtual
 372 #endif
 373                 public bool HaveResponse {
 374                         get { return haveResponse; }
 375                 }
 376
 377                 public override WebHeaderCollection Headers {
 378                         get { return webHeaders; }
 379                         set {
 380                                 CheckRequestStarted ();
 381                                 WebHeaderCollection newHeaders = new WebHeaderCollection (WebHeaderCollection.HeaderInfo.Request);
 382                                 int count = value.Count;
 383                                 for (int i = 0; i < count; i++)
 384                                         newHeaders.Add (value.GetKey (i), value.Get (i));
 385
 386                                 webHeaders = newHeaders;
 387                         }
 388                 }
 389
 390 #if NET_4_0
 391                 public
 392 #else
 393                 internal
 394 #endif
 395                 string Host {
 396                         get {
 397                                 if (host == null)
 398                                         return actualUri.Authority;
 399                                 return host;
 400                         }
 401                         set {
 402                                 if (value == null)
 403                                         throw new ArgumentNullException ("value");
 404
 405                                 if (!CheckValidHost (actualUri.Scheme, value))
 406                                         throw new ArgumentException ("Invalid host: " + value);
 407
 408                                 host = value;
 409                         }
 410                 }
 411
 412                 static bool CheckValidHost (string scheme, string val)
 413                 {
 414                         if (val.Length == 0)
 415                                 return false;
 416
 417                         if (val [0] == '.')
 418                                 return false;
 419
 420                         int idx = val.IndexOf ('/');
 421                         if (idx >= 0)
 422                                 return false;
 423
 424                         string u = scheme + "://" + val + "/";
 425                         return Uri.IsWellFormedUriString (u, UriKind.Absolute);
 426                 }
 427
 428                 public DateTime IfModifiedSince {
 429                         get {
 430                                 string str = webHeaders ["If-Modified-Since"];
 431                                 if (str == null)
 432                                         return DateTime.Now;
 433                                 try {
 434                                         return MonoHttpDate.Parse (str);
 435                                 } catch (Exception) {
 436                                         return DateTime.Now;
 437                                 }
 438                         }
 439                         set {
 440                                 CheckRequestStarted ();
 441                                 // rfc-1123 pattern
 442                                 webHeaders.SetInternal ("If-Modified-Since",
 443                                         value.ToUniversalTime ().ToString ("r", null));
 444                                 // TODO: check last param when using different locale
 445                         }
 446                 }
 447
 448                 public bool KeepAlive {
 449                         get {
 450                                 return keepAlive;
 451                         }
 452                         set {
 453                                 keepAlive = value;
 454                         }
 455                 }
 456
 457                 public int MaximumAutomaticRedirections {
 458                         get { return maxAutoRedirect; }
 459                         set {
 460                                 if (value <= 0)
 461                                         throw new ArgumentException ("Must be > 0", "value");
 462
 463                                 maxAutoRedirect = value;
 464                         }
 465                 }
 466
 467                 [MonoTODO ("Use this")]
 468                 public int MaximumResponseHeadersLength {
 469                         get { return maxResponseHeadersLength; }
 470                         set { maxResponseHeadersLength = value; }
 471                 }
 472
 473                 [MonoTODO ("Use this")]
 474                 public static int DefaultMaximumResponseHeadersLength {
 475                         get { return defaultMaxResponseHeadersLength; }
 476                         set { defaultMaxResponseHeadersLength = value; }
 477                 }
 478
 479                 public  int ReadWriteTimeout {
 480                         get { return readWriteTimeout; }
 481                         set {
 482                                 if (requestSent)
 483                                         throw new InvalidOperationException ("The request has already been sent.");
 484
 485                                 if (value < -1)
 486                                         throw new ArgumentOutOfRangeException ("value", "Must be >= -1");
 487
 488                                 readWriteTimeout = value;
 489                         }
 490                 }
 491
 492 #if NET_4_5
 493                 [MonoTODO]
 494                 public int ContinueTimeout {
 495                         get { throw new NotImplementedException (); }
 496                         set { throw new NotImplementedException (); }
 497                 }
 498 #endif
 499
 500                 public string MediaType {
 501                         get { return mediaType; }
 502                         set {
 503                                 mediaType = value;
 504                         }
 505                 }
 506
 507                 public override string Method {
 508                         get { return this.method; }
 509                         set {
 510                                 if (value == null || value.Trim () == "")
 511                                         throw new ArgumentException ("not a valid method");
 512
 513                                 method = value.ToUpperInvariant ();
 514                                 if (method != "HEAD" && method != "GET" && method != "POST" && method != "PUT" &&
 515                                         method != "DELETE" && method != "CONNECT" && method != "TRACE" &&
 516                                         method != "MKCOL") {
 517                                         method = value;
 518                                 }
 519                         }
 520                 }
 521
 522                 public bool Pipelined {
 523                         get { return pipelined; }
 524                         set { pipelined = value; }
 525                 }
 526
 527                 public override bool PreAuthenticate {
 528                         get { return preAuthenticate; }
 529                         set { preAuthenticate = value; }
 530                 }
 531
 532                 public Version ProtocolVersion {
 533                         get { return version; }
 534                         set {
 535                                 if (value != HttpVersion.Version10 && value != HttpVersion.Version11)
 536                                         throw new ArgumentException ("value");
 537
 538                                 force_version = true;
 539                                 version = value;
 540                         }
 541                 }
 542
 543                 public override IWebProxy Proxy {
 544                         get { return proxy; }
 545                         set {
 546                                 CheckRequestStarted ();
 547                                 proxy = value;
 548                                 servicePoint = null; // we may need a new one
 549                         }
 550                 }
 551
 552                 public string Referer {
 553                         get { return webHeaders ["Referer"]; }
 554                         set {
 555                                 CheckRequestStarted ();
 556                                 if (value == null || value.Trim().Length == 0) {
 557                                         webHeaders.RemoveInternal ("Referer");
 558                                         return;
 559                                 }
 560                                 webHeaders.SetInternal ("Referer", value);
 561                         }
 562                 }
 563
 564                 public override Uri RequestUri {
 565                         get { return requestUri; }
 566                 }
 567
 568                 public bool SendChunked {
 569                         get { return sendChunked; }
 570                         set {
 571                                 CheckRequestStarted ();
 572                                 sendChunked = value;
 573                         }
 574                 }
 575
 576                 public ServicePoint ServicePoint {
 577                         get { return GetServicePoint (); }
 578                 }
 579
 580                 internal ServicePoint ServicePointNoLock {
 581                         get { return servicePoint; }
 582                 }
 583 #if NET_4_0
 584                 [MonoTODO ("for portable library support")]
 585                 public virtual bool SupportsCookieContainer {
 586                         get {
 587                                 throw new NotImplementedException ();
 588                         }
 589                 }
 590 #endif
 591                 public override int Timeout {
 592                         get { return timeout; }
 593                         set {
 594                                 if (value < -1)
 595                                         throw new ArgumentOutOfRangeException ("value");
 596
 597                                 timeout = value;
 598                         }
 599                 }
 600
 601                 public string TransferEncoding {
 602                         get { return webHeaders ["Transfer-Encoding"]; }
 603                         set {
 604                                 CheckRequestStarted ();
 605                                 string val = value;
 606                                 if (val != null)
 607                                         val = val.Trim ().ToLower ();
 608
 609                                 if (val == null || val.Length == 0) {
 610                                         webHeaders.RemoveInternal ("Transfer-Encoding");
 611                                         return;
 612                                 }
 613
 614                                 if (val == "chunked")
 615                                         throw new ArgumentException ("Chunked encoding must be set with the SendChunked property");
 616
 617                                 if (!sendChunked)
 618                                         throw new ArgumentException ("SendChunked must be True", "value");
 619
 620                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", value);
 621                         }
 622                 }
 623
 624                 public override bool UseDefaultCredentials
 625                 {
 626                         get { return CredentialCache.DefaultCredentials == Credentials; }
 627                         set { Credentials = value ? CredentialCache.DefaultCredentials : null; }
 628                 }
 629
 630                 public string UserAgent {
 631                         get { return webHeaders ["User-Agent"]; }
 632                         set { webHeaders.SetInternal ("User-Agent", value); }
 633                 }
 634
 635                 bool unsafe_auth_blah;
 636                 public bool UnsafeAuthenticatedConnectionSharing
 637                 {
 638                         get { return unsafe_auth_blah; }
 639                         set { unsafe_auth_blah = value; }
 640                 }
 641
 642                 internal bool GotRequestStream {
 643                         get { return gotRequestStream; }
 644                 }
 645
 646                 internal bool ExpectContinue {
 647                         get { return expectContinue; }
 648                         set { expectContinue = value; }
 649                 }
 650
 651                 internal Uri AuthUri {
 652                         get { return actualUri; }
 653                 }
 654
 655                 internal bool ProxyQuery {
 656                         get { return servicePoint.UsesProxy && !servicePoint.UseConnect; }
 657                 }
 658
 659                 // Methods
 660
 661                 internal ServicePoint GetServicePoint ()
 662                 {
 663                         lock (locker) {
 664                                 if (hostChanged || servicePoint == null) {
 665                                         servicePoint = ServicePointManager.FindServicePoint (actualUri, proxy);
 666                                         hostChanged = false;
 667                                 }
 668                         }
 669
 670                         return servicePoint;
 671                 }
 672
 673                 public void AddRange (int range)
 674                 {
 675                         AddRange ("bytes", (long) range);
 676                 }
 677
 678                 public void AddRange (int from, int to)
 679                 {
 680                         AddRange ("bytes", (long) from, (long) to);
 681                 }
 682
 683                 public void AddRange (string rangeSpecifier, int range)
 684                 {
 685                         AddRange (rangeSpecifier, (long) range);
 686                 }
 687
 688                 public void AddRange (string rangeSpecifier, int from, int to)
 689                 {
 690                         AddRange (rangeSpecifier, (long) from, (long) to);
 691                 }
 692 #if NET_4_0
 693                 public
 694 #else
 695                 internal
 696 #endif
 697                 void AddRange (long range)
 698                 {
 699                         AddRange ("bytes", (long) range);
 700                 }
 701
 702 #if NET_4_0
 703                 public
 704 #else
 705                 internal
 706 #endif
 707                 void AddRange (long from, long to)
 708                 {
 709                         AddRange ("bytes", from, to);
 710                 }
 711
 712 #if NET_4_0
 713                 public
 714 #else
 715                 internal
 716 #endif
 717                 void AddRange (string rangeSpecifier, long range)
 718                 {
 719                         if (rangeSpecifier == null)
 720                                 throw new ArgumentNullException ("rangeSpecifier");
 721                         if (!WebHeaderCollection.IsHeaderValue (rangeSpecifier))
 722                                 throw new ArgumentException ("Invalid range specifier", "rangeSpecifier");
 723
 724                         string r = webHeaders ["Range"];
 725                         if (r == null)
 726                                 r = rangeSpecifier + "=";
 727                         else {
 728                                 string old_specifier = r.Substring (0, r.IndexOf ('='));
 729                                 if (String.Compare (old_specifier, rangeSpecifier, StringComparison.OrdinalIgnoreCase) != 0)
 730                                         throw new InvalidOperationException ("A different range specifier is already in use");
 731                                 r += ",";
 732                         }
 733
 734                         string n = range.ToString (CultureInfo.InvariantCulture);
 735                         if (range < 0)
 736                                 r = r + "0" + n;
 737                         else
 738                                 r = r + n + "-";
 739                         webHeaders.RemoveAndAdd ("Range", r);
 740                 }
 741
 742 #if NET_4_0
 743                 public
 744 #else
 745                 internal
 746 #endif
 747                 void AddRange (string rangeSpecifier, long from, long to)
 748                 {
 749                         if (rangeSpecifier == null)
 750                                 throw new ArgumentNullException ("rangeSpecifier");
 751                         if (!WebHeaderCollection.IsHeaderValue (rangeSpecifier))
 752                                 throw new ArgumentException ("Invalid range specifier", "rangeSpecifier");
 753                         if (from > to || from < 0)
 754                                 throw new ArgumentOutOfRangeException ("from");
 755                         if (to < 0)
 756                                 throw new ArgumentOutOfRangeException ("to");
 757
 758                         string r = webHeaders ["Range"];
 759                         if (r == null)
 760                                 r = rangeSpecifier + "=";
 761                         else
 762                                 r += ",";
 763
 764                         r = String.Format ("{0}{1}-{2}", r, from, to);
 765                         webHeaders.RemoveAndAdd ("Range", r);
 766                 }
 767
 768
 769                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 770                 {
 771                         if (Aborted)
 772                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 773
 774                         bool send = !(method == "GET" || method == "CONNECT" || method == "HEAD" ||
 775                                         method == "TRACE");
 776                         if (method == null || !send)
 777                                 throw new ProtocolViolationException ("Cannot send data when method is: " + method);
 778
 779                         if (contentLength == -1 && !sendChunked && !allowBuffering && KeepAlive)
 780                                 throw new ProtocolViolationException ("Content-Length not set");
 781
 782                         string transferEncoding = TransferEncoding;
 783                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 784                                 throw new ProtocolViolationException ("SendChunked should be true.");
 785
 786                         lock (locker)
 787                         {
 788                                 if (getResponseCalled)
 789                                         throw new InvalidOperationException ("The operation cannot be performed once the request has been submitted.");
 790
 791                                 if (asyncWrite != null) {
 792                                         throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 793                                                                 "method while a previous call is still in progress.");
 794                                 }
 795
 796                                 asyncWrite = new WebAsyncResult (this, callback, state);
 797                                 initialMethod = method;
 798                                 if (haveRequest) {
 799                                         if (writeStream != null) {
 800                                                 asyncWrite.SetCompleted (true, writeStream);
 801                                                 asyncWrite.DoCallback ();
 802                                                 return asyncWrite;
 803                                         }
 804                                 }
 805
 806                                 gotRequestStream = true;
 807                                 WebAsyncResult result = asyncWrite;
 808                                 if (!requestSent) {
 809                                         requestSent = true;
 810                                         redirects = 0;
 811                                         servicePoint = GetServicePoint ();
 812                                         abortHandler = servicePoint.SendRequest (this, connectionGroup);
 813                                 }
 814                                 return result;
 815                         }
 816                 }
 817
 818                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 819                 {
 820                         if (asyncResult == null)
 821                                 throw new ArgumentNullException ("asyncResult");
 822
 823                         WebAsyncResult result = asyncResult as WebAsyncResult;
 824                         if (result == null)
 825                                 throw new ArgumentException ("Invalid IAsyncResult");
 826
 827                         asyncWrite = result;
 828                         result.WaitUntilComplete ();
 829
 830                         Exception e = result.Exception;
 831                         if (e != null)
 832                                 throw e;
 833
 834                         return result.WriteStream;
 835                 }
 836
 837                 public override Stream GetRequestStream()
 838                 {
 839                         IAsyncResult asyncResult = asyncWrite;
 840                         if (asyncResult == null) {
 841                                 asyncResult = BeginGetRequestStream (null, null);
 842                                 asyncWrite = (WebAsyncResult) asyncResult;
 843                         }
 844
 845                         if (!asyncResult.IsCompleted && !asyncResult.AsyncWaitHandle.WaitOne (timeout, false)) {
 846                                 Abort ();
 847                                 throw new WebException ("The request timed out", WebExceptionStatus.Timeout);
 848                         }
 849
 850                         return EndGetRequestStream (asyncResult);
 851                 }
 852
 853                 void CheckIfForceWrite ()
 854                 {
 855                         if (writeStream == null || writeStream.RequestWritten || !InternalAllowBuffering)
 856                                 return;
 857 #if NET_4_0
 858                         if (contentLength < 0 && writeStream.CanWrite == true && writeStream.WriteBufferLength < 0)
 859                                 return;
 860
 861                         if (contentLength < 0 && writeStream.WriteBufferLength >= 0)
 862                                 InternalContentLength = writeStream.WriteBufferLength;
 863 #else
 864                         if (contentLength < 0 && writeStream.CanWrite == true)
 865                                 return;
 866 #endif
 867
 868                         // This will write the POST/PUT if the write stream already has the expected
 869                         // amount of bytes in it (ContentLength) (bug #77753) or if the write stream
 870                         // contains data and it has been closed already (xamarin bug #1512).
 871
 872                         if (writeStream.WriteBufferLength == contentLength || (contentLength == -1 && writeStream.CanWrite == false))
 873                                 writeStream.WriteRequest ();
 874                 }
 875
 876                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 877                 {
 878                         if (Aborted)
 879                                 throw new WebException ("The request was canceled.", WebExceptionStatus.RequestCanceled);
 880
 881                         if (method == null)
 882                                 throw new ProtocolViolationException ("Method is null.");
 883
 884                         string transferEncoding = TransferEncoding;
 885                         if (!sendChunked && transferEncoding != null && transferEncoding.Trim () != "")
 886                                 throw new ProtocolViolationException ("SendChunked should be true.");
 887
 888                         Monitor.Enter (locker);
 889                         getResponseCalled = true;
 890                         if (asyncRead != null && !haveResponse) {
 891                                 Monitor.Exit (locker);
 892                                 throw new InvalidOperationException ("Cannot re-call start of asynchronous " +
 893                                                         "method while a previous call is still in progress.");
 894                         }
 895
 896                         CheckIfForceWrite ();
 897                         asyncRead = new WebAsyncResult (this, callback, state);
 898                         WebAsyncResult aread = asyncRead;
 899                         initialMethod = method;
 900                         if (haveResponse) {
 901                                 Exception saved = saved_exc;
 902                                 if (webResponse != null) {
 903                                         Monitor.Exit (locker);
 904                                         if (saved == null) {
 905                                                 aread.SetCompleted (true, webResponse);
 906                                         } else {
 907                                                 aread.SetCompleted (true, saved);
 908                                         }
 909                                         aread.DoCallback ();
 910                                         return aread;
 911                                 } else if (saved != null) {
 912                                         Monitor.Exit (locker);
 913                                         aread.SetCompleted (true, saved);
 914                                         aread.DoCallback ();
 915                                         return aread;
 916                                 }
 917                         }
 918
 919                         if (!requestSent) {
 920                                 requestSent = true;
 921                                 redirects = 0;
 922                                 servicePoint = GetServicePoint ();
 923                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
 924                         }
 925
 926                         Monitor.Exit (locker);
 927                         return aread;
 928                 }
 929
 930                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 931                 {
 932                         if (asyncResult == null)
 933                                 throw new ArgumentNullException ("asyncResult");
 934
 935                         WebAsyncResult result = asyncResult as WebAsyncResult;
 936                         if (result == null)
 937                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
 938
 939                         if (!result.WaitUntilComplete (timeout, false)) {
 940                                 Abort ();
 941                                 throw new WebException("The request timed out", WebExceptionStatus.Timeout);
 942                         }
 943
 944                         if (result.GotException)
 945                                 throw result.Exception;
 946
 947                         return result.Response;
 948                 }
 949
 950                 public override WebResponse GetResponse()
 951                 {
 952                         WebAsyncResult result = (WebAsyncResult) BeginGetResponse (null, null);
 953                         return EndGetResponse (result);
 954                 }
 955
 956                 internal bool FinishedReading {
 957                         get { return finished_reading; }
 958                         set { finished_reading = value; }
 959                 }
 960
 961                 internal bool Aborted {
 962                         get { return Interlocked.CompareExchange (ref aborted, 0, 0) == 1; }
 963                 }
 964
 965                 public override void Abort ()
 966                 {
 967                         if (Interlocked.CompareExchange (ref aborted, 1, 0) == 1)
 968                                 return;
 969
 970                         if (haveResponse && finished_reading)
 971                                 return;
 972
 973                         haveResponse = true;
 974                         if (abortHandler != null) {
 975                                 try {
 976                                         abortHandler (this, EventArgs.Empty);
 977                                 } catch (Exception) {}
 978                                 abortHandler = null;
 979                         }
 980
 981                         if (asyncWrite != null) {
 982                                 WebAsyncResult r = asyncWrite;
 983                                 if (!r.IsCompleted) {
 984                                         try {
 985                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 986                                                 r.SetCompleted (false, wexc);
 987                                                 r.DoCallback ();
 988                                         } catch {}
 989                                 }
 990                                 asyncWrite = null;
 991                         }
 992
 993                         if (asyncRead != null) {
 994                                 WebAsyncResult r = asyncRead;
 995                                 if (!r.IsCompleted) {
 996                                         try {
 997                                                 WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled);
 998                                                 r.SetCompleted (false, wexc);
 999                                                 r.DoCallback ();
1000                                         } catch {}
1001                                 }
1002                                 asyncRead = null;
1003                         }
1004
1005                         if (writeStream != null) {
1006                                 try {
1007                                         writeStream.Close ();
1008                                         writeStream = null;
1009                                 } catch {}
1010                         }
1011
1012                         if (webResponse != null) {
1013                                 try {
1014                                         webResponse.Close ();
1015                                         webResponse = null;
1016                                 } catch {}
1017                         }
1018                 }
1019
1020                 void ISerializable.GetObjectData (SerializationInfo serializationInfo,
1021                                                   StreamingContext streamingContext)
1022                 {
1023                         GetObjectData (serializationInfo, streamingContext);
1024                 }
1025
1026                 protected override void GetObjectData (SerializationInfo serializationInfo,
1027                         StreamingContext streamingContext)
1028                 {
1029                         SerializationInfo info = serializationInfo;
1030
1031                         info.AddValue ("requestUri", requestUri, typeof (Uri));
1032                         info.AddValue ("actualUri", actualUri, typeof (Uri));
1033                         info.AddValue ("allowAutoRedirect", allowAutoRedirect);
1034                         info.AddValue ("allowBuffering", allowBuffering);
1035                         info.AddValue ("certificates", certificates, typeof (X509CertificateCollection));
1036                         info.AddValue ("connectionGroup", connectionGroup);
1037                         info.AddValue ("contentLength", contentLength);
1038                         info.AddValue ("webHeaders", webHeaders, typeof (WebHeaderCollection));
1039                         info.AddValue ("keepAlive", keepAlive);
1040                         info.AddValue ("maxAutoRedirect", maxAutoRedirect);
1041                         info.AddValue ("mediaType", mediaType);
1042                         info.AddValue ("method", method);
1043                         info.AddValue ("initialMethod", initialMethod);
1044                         info.AddValue ("pipelined", pipelined);
1045                         info.AddValue ("version", version, typeof (Version));
1046                         info.AddValue ("proxy", proxy, typeof (IWebProxy));
1047                         info.AddValue ("sendChunked", sendChunked);
1048                         info.AddValue ("timeout", timeout);
1049                         info.AddValue ("redirects", redirects);
1050                         info.AddValue ("host", host);
1051                 }
1052
1053                 void CheckRequestStarted ()
1054                 {
1055                         if (requestSent)
1056                                 throw new InvalidOperationException ("request started");
1057                 }
1058
1059                 internal void DoContinueDelegate (int statusCode, WebHeaderCollection headers)
1060                 {
1061                         if (continueDelegate != null)
1062                                 continueDelegate (statusCode, headers);
1063                 }
1064
1065                 bool Redirect (WebAsyncResult result, HttpStatusCode code)
1066                 {
1067                         redirects++;
1068                         Exception e = null;
1069                         string uriString = null;
1070
1071                         switch (code) {
1072                         case HttpStatusCode.Ambiguous: // 300
1073                                 e = new WebException ("Ambiguous redirect.");
1074                                 break;
1075                         case HttpStatusCode.MovedPermanently: // 301
1076                         case HttpStatusCode.Redirect: // 302
1077                         case HttpStatusCode.TemporaryRedirect: // 307
1078                                 /* MS follows the redirect for POST too
1079                                 if (method != "GET" && method != "HEAD") // 10.3
1080                                         return false;
1081                                 */
1082
1083                                 contentLength = -1;
1084                                 bodyBufferLength = 0;
1085                                 bodyBuffer = null;
1086                                 if (code != HttpStatusCode.TemporaryRedirect)
1087                                         method = "GET";
1088                                 uriString = webResponse.Headers ["Location"];
1089                                 break;
1090                         case HttpStatusCode.SeeOther: //303
1091                                 method = "GET";
1092                                 uriString = webResponse.Headers ["Location"];
1093                                 break;
1094                         case HttpStatusCode.NotModified: // 304
1095                                 return false;
1096                         case HttpStatusCode.UseProxy: // 305
1097                                 e = new NotImplementedException ("Proxy support not available.");
1098                                 break;
1099                         case HttpStatusCode.Unused: // 306
1100                         default:
1101                                 e = new ProtocolViolationException ("Invalid status code: " + (int) code);
1102                                 break;
1103                         }
1104
1105                         if (e != null)
1106                                 throw e;
1107
1108                         if (uriString == null)
1109                                 throw new WebException ("No Location header found for " + (int) code,
1110                                                         WebExceptionStatus.ProtocolError);
1111
1112                         Uri prev = actualUri;
1113                         try {
1114                                 actualUri = new Uri (actualUri, uriString);
1115                         } catch (Exception) {
1116                                 throw new WebException (String.Format ("Invalid URL ({0}) for {1}",
1117                                                                         uriString, (int) code),
1118                                                                         WebExceptionStatus.ProtocolError);
1119                         }
1120
1121                         hostChanged = (actualUri.Scheme != prev.Scheme || Host != prev.Authority);
1122                         return true;
1123                 }
1124
1125                 string GetHeaders ()
1126                 {
1127                         bool continue100 = false;
1128                         if (sendChunked) {
1129                                 continue100 = true;
1130                                 webHeaders.RemoveAndAdd ("Transfer-Encoding", "chunked");
1131                                 webHeaders.RemoveInternal ("Content-Length");
1132                         } else if (contentLength != -1) {
1133                                 if (ntlm_auth_state != NtlmAuthState.Challenge) {
1134                                         if (contentLength > 0)
1135                                                 continue100 = true;
1136
1137                                         webHeaders.SetInternal ("Content-Length", contentLength.ToString ());
1138                                 } else {
1139                                         webHeaders.SetInternal ("Content-Length", "0");
1140                                 }
1141                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1142                         } else {
1143                                 webHeaders.RemoveInternal ("Content-Length");
1144                         }
1145
1146                         if (actualVersion == HttpVersion.Version11 && continue100 &&
1147                             servicePoint.SendContinue) { // RFC2616 8.2.3
1148                                 webHeaders.RemoveAndAdd ("Expect" , "100-continue");
1149                                 expectContinue = true;
1150                         } else {
1151                                 webHeaders.RemoveInternal ("Expect");
1152                                 expectContinue = false;
1153                         }
1154
1155                         bool proxy_query = ProxyQuery;
1156                         string connectionHeader = (proxy_query) ? "Proxy-Connection" : "Connection";
1157                         webHeaders.RemoveInternal ((!proxy_query) ? "Proxy-Connection" : "Connection");
1158                         Version proto_version = servicePoint.ProtocolVersion;
1159                         bool spoint10 = (proto_version == null || proto_version == HttpVersion.Version10);
1160
1161                         if (keepAlive && (version == HttpVersion.Version10 || spoint10)) {
1162                                 webHeaders.RemoveAndAdd (connectionHeader, "keep-alive");
1163                         } else if (!keepAlive && version == HttpVersion.Version11) {
1164                                 webHeaders.RemoveAndAdd (connectionHeader, "close");
1165                         }
1166
1167                         webHeaders.SetInternal ("Host", Host);
1168                         if (cookieContainer != null) {
1169                                 string cookieHeader = cookieContainer.GetCookieHeader (actualUri);
1170                                 if (cookieHeader != "")
1171                                         webHeaders.RemoveAndAdd ("Cookie", cookieHeader);
1172                                 else
1173                                         webHeaders.RemoveInternal ("Cookie");
1174                         }
1175
1176                         string accept_encoding = null;
1177                         if ((auto_decomp & DecompressionMethods.GZip) != 0)
1178                                 accept_encoding = "gzip";
1179                         if ((auto_decomp & DecompressionMethods.Deflate) != 0)
1180                                 accept_encoding = accept_encoding != null ? "gzip, deflate" : "deflate";
1181                         if (accept_encoding != null)
1182                                 webHeaders.RemoveAndAdd ("Accept-Encoding", accept_encoding);
1183
1184                         if (!usedPreAuth && preAuthenticate)
1185                                 DoPreAuthenticate ();
1186
1187                         return webHeaders.ToString ();
1188                 }
1189
1190                 void DoPreAuthenticate ()
1191                 {
1192                         bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1193                         ICredentials creds = (!isProxy || credentials != null) ? credentials : proxy.Credentials;
1194                         Authorization auth = AuthenticationManager.PreAuthenticate (this, creds);
1195                         if (auth == null)
1196                                 return;
1197
1198                         webHeaders.RemoveInternal ("Proxy-Authorization");
1199                         webHeaders.RemoveInternal ("Authorization");
1200                         string authHeader = (isProxy && credentials == null) ? "Proxy-Authorization" : "Authorization";
1201                         webHeaders [authHeader] = auth.Message;
1202                         usedPreAuth = true;
1203                 }
1204
1205                 internal void SetWriteStreamError (WebExceptionStatus status, Exception exc)
1206                 {
1207                         if (Aborted)
1208                                 return;
1209
1210                         WebAsyncResult r = asyncWrite;
1211                         if (r == null)
1212                                 r = asyncRead;
1213
1214                         if (r != null) {
1215                                 string msg;
1216                                 WebException wex;
1217                                 if (exc == null) {
1218                                         msg = "Error: " + status;
1219                                         wex = new WebException (msg, status);
1220                                 } else {
1221                                         msg = String.Format ("Error: {0} ({1})", status, exc.Message);
1222                                         wex = new WebException (msg, exc, status);
1223                                 }
1224                                 r.SetCompleted (false, wex);
1225                                 r.DoCallback ();
1226                         }
1227                 }
1228
1229                 internal void SendRequestHeaders (bool propagate_error)
1230                 {
1231                         StringBuilder req = new StringBuilder ();
1232                         string query;
1233                         if (!ProxyQuery) {
1234                                 query = actualUri.PathAndQuery;
1235                         } else {
1236                                 query = String.Format ("{0}://{1}{2}",  actualUri.Scheme,
1237                                                                         Host,
1238                                                                         actualUri.PathAndQuery);
1239                         }
1240
1241                         if (!force_version && servicePoint.ProtocolVersion != null && servicePoint.ProtocolVersion < version) {
1242                                 actualVersion = servicePoint.ProtocolVersion;
1243                         } else {
1244                                 actualVersion = version;
1245                         }
1246
1247                         req.AppendFormat ("{0} {1} HTTP/{2}.{3}\r\n", method, query,
1248                                                                 actualVersion.Major, actualVersion.Minor);
1249                         req.Append (GetHeaders ());
1250                         string reqstr = req.ToString ();
1251                         byte [] bytes = Encoding.UTF8.GetBytes (reqstr);
1252                         try {
1253                                 writeStream.SetHeaders (bytes);
1254                         } catch (WebException wexc) {
1255                                 SetWriteStreamError (wexc.Status, wexc);
1256                                 if (propagate_error)
1257                                         throw;
1258                         } catch (Exception exc) {
1259                                 SetWriteStreamError (WebExceptionStatus.SendFailure, exc);
1260                                 if (propagate_error)
1261                                         throw;
1262                         }
1263                 }
1264
1265                 internal void SetWriteStream (WebConnectionStream stream)
1266                 {
1267                         if (Aborted)
1268                                 return;
1269
1270                         writeStream = stream;
1271                         if (bodyBuffer != null) {
1272                                 webHeaders.RemoveInternal ("Transfer-Encoding");
1273                                 contentLength = bodyBufferLength;
1274                                 writeStream.SendChunked = false;
1275                         }
1276
1277                         SendRequestHeaders (false);
1278
1279                         haveRequest = true;
1280
1281                         if (bodyBuffer != null) {
1282                                 // The body has been written and buffered. The request "user"
1283                                 // won't write it again, so we must do it.
1284                                 if (ntlm_auth_state != NtlmAuthState.Challenge) {
1285                                         writeStream.Write (bodyBuffer, 0, bodyBufferLength);
1286                                         bodyBuffer = null;
1287                                         writeStream.Close ();
1288                                 }
1289                         } else if (method != "HEAD" && method != "GET" && method != "MKCOL" && method != "CONNECT" &&
1290                                         method != "TRACE") {
1291                                 if (getResponseCalled && !writeStream.RequestWritten)
1292                                         writeStream.WriteRequest ();
1293                         }
1294
1295                         if (asyncWrite != null) {
1296                                 asyncWrite.SetCompleted (false, stream);
1297                                 asyncWrite.DoCallback ();
1298                                 asyncWrite = null;
1299                         }
1300                 }
1301
1302                 internal void SetResponseError (WebExceptionStatus status, Exception e, string where)
1303                 {
1304                         if (Aborted)
1305                                 return;
1306                         lock (locker) {
1307                         string msg = String.Format ("Error getting response stream ({0}): {1}", where, status);
1308                         WebAsyncResult r = asyncRead;
1309                         if (r == null)
1310                                 r = asyncWrite;
1311
1312                         WebException wexc;
1313                         if (e is WebException) {
1314                                 wexc = (WebException) e;
1315                         } else {
1316                                 wexc = new WebException (msg, e, status, null);
1317                         }
1318                         if (r != null) {
1319                                 if (!r.IsCompleted) {
1320                                         r.SetCompleted (false, wexc);
1321                                         r.DoCallback ();
1322                                 } else if (r == asyncWrite) {
1323                                         saved_exc = wexc;
1324                                 }
1325                                 haveResponse = true;
1326                                 asyncRead = null;
1327                                 asyncWrite = null;
1328                         } else {
1329                                 haveResponse = true;
1330                                 saved_exc = wexc;
1331                         }
1332                         }
1333                 }
1334
1335                 void CheckSendError (WebConnectionData data)
1336                 {
1337                         // Got here, but no one called GetResponse
1338                         int status = data.StatusCode;
1339                         if (status < 400 || status == 401 || status == 407)
1340                                 return;
1341
1342                         if (writeStream != null && asyncRead == null && !writeStream.CompleteRequestWritten) {
1343                                 // The request has not been completely sent and we got here!
1344                                 // We should probably just close and cause an error in any case,
1345                                 saved_exc = new WebException (data.StatusDescription, null, WebExceptionStatus.ProtocolError, webResponse);
1346                                 if (allowBuffering || sendChunked || writeStream.totalWritten >= contentLength) {
1347                                         webResponse.ReadAll ();
1348                                 } else {
1349                                         writeStream.IgnoreIOErrors = true;
1350                                 }
1351                         }
1352                 }
1353
1354                 void HandleNtlmAuth (WebAsyncResult r)
1355                 {
1356                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1357                         if (wce != null) {
1358                                 WebConnection cnc = wce.Connection;
1359                                 cnc.PriorityRequest = this;
1360                                 bool isProxy = (proxy != null && !proxy.IsBypassed (actualUri));
1361                                 ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1362                                 if (creds != null) {
1363                                         cnc.NtlmCredential = creds.GetCredential (requestUri, "NTLM");
1364                                         cnc.UnsafeAuthenticatedConnectionSharing = unsafe_auth_blah;
1365                                 }
1366                         }
1367                         r.Reset ();
1368                         finished_reading = false;
1369                         haveResponse = false;
1370                         webResponse.ReadAll ();
1371                         webResponse = null;
1372                 }
1373
1374                 internal void SetResponseData (WebConnectionData data)
1375                 {
1376                         lock (locker) {
1377                         if (Aborted) {
1378                                 if (data.stream != null)
1379                                         data.stream.Close ();
1380                                 return;
1381                         }
1382
1383                         WebException wexc = null;
1384                         try {
1385                                 webResponse = new HttpWebResponse (actualUri, method, data, cookieContainer);
1386                         } catch (Exception e) {
1387                                 wexc = new WebException (e.Message, e, WebExceptionStatus.ProtocolError, null);
1388                                 if (data.stream != null)
1389                                         data.stream.Close ();
1390                         }
1391
1392                         if (wexc == null && (method == "POST" || method == "PUT")) {
1393                                 CheckSendError (data);
1394                                 if (saved_exc != null)
1395                                         wexc = (WebException) saved_exc;
1396                         }
1397
1398                         WebAsyncResult r = asyncRead;
1399
1400                         bool forced = false;
1401                         if (r == null && webResponse != null) {
1402                                 // This is a forced completion (302, 204)...
1403                                 forced = true;
1404                                 r = new WebAsyncResult (null, null);
1405                                 r.SetCompleted (false, webResponse);
1406                         }
1407
1408                         if (r != null) {
1409                                 if (wexc != null) {
1410                                         haveResponse = true;
1411                                         if (!r.IsCompleted)
1412                                                 r.SetCompleted (false, wexc);
1413                                         r.DoCallback ();
1414                                         return;
1415                                 }
1416
1417                                 bool redirected;
1418                                 try {
1419                                         redirected = CheckFinalStatus (r);
1420                                         if (!redirected) {
1421                                                 if (ntlm_auth_state != NtlmAuthState.None && authCompleted && webResponse != null
1422                                                         && (int)webResponse.StatusCode < 400) {
1423                                                         WebConnectionStream wce = webResponse.GetResponseStream () as WebConnectionStream;
1424                                                         if (wce != null) {
1425                                                                 WebConnection cnc = wce.Connection;
1426                                                                 cnc.NtlmAuthenticated = true;
1427                                                         }
1428                                                 }
1429
1430                                                 // clear internal buffer so that it does not
1431                                                 // hold possible big buffer (bug #397627)
1432                                                 if (writeStream != null)
1433                                                         writeStream.KillBuffer ();
1434
1435                                                 haveResponse = true;
1436                                                 r.SetCompleted (false, webResponse);
1437                                                 r.DoCallback ();
1438                                         } else {
1439                                                 if (webResponse != null) {
1440                                                         if (ntlm_auth_state != NtlmAuthState.None) {
1441                                                                 HandleNtlmAuth (r);
1442                                                                 return;
1443                                                         }
1444                                                         webResponse.Close ();
1445                                                 }
1446                                                 finished_reading = false;
1447                                                 haveResponse = false;
1448                                                 webResponse = null;
1449                                                 r.Reset ();
1450                                                 servicePoint = GetServicePoint ();
1451                                                 abortHandler = servicePoint.SendRequest (this, connectionGroup);
1452                                         }
1453                                 } catch (WebException wexc2) {
1454                                         if (forced) {
1455                                                 saved_exc = wexc2;
1456                                                 haveResponse = true;
1457                                         }
1458                                         r.SetCompleted (false, wexc2);
1459                                         r.DoCallback ();
1460                                         return;
1461                                 } catch (Exception ex) {
1462                                         wexc = new WebException (ex.Message, ex, WebExceptionStatus.ProtocolError, null);
1463                                         if (forced) {
1464                                                 saved_exc = wexc;
1465                                                 haveResponse = true;
1466                                         }
1467                                         r.SetCompleted (false, wexc);
1468                                         r.DoCallback ();
1469                                         return;
1470                                 }
1471                         }
1472                         }
1473                 }
1474
1475                 bool CheckAuthorization (WebResponse response, HttpStatusCode code)
1476                 {
1477                         authCompleted = false;
1478                         if (code == HttpStatusCode.Unauthorized && credentials == null)
1479                                 return false;
1480
1481                         bool isProxy = (code == HttpStatusCode.ProxyAuthenticationRequired);
1482                         if (isProxy && (proxy == null || proxy.Credentials == null))
1483                                 return false;
1484
1485                         string [] authHeaders = response.Headers.GetValues_internal ( (isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate", false);
1486                         if (authHeaders == null || authHeaders.Length == 0)
1487                                 return false;
1488
1489                         ICredentials creds = (!isProxy) ? credentials : proxy.Credentials;
1490                         Authorization auth = null;
1491                         foreach (string authHeader in authHeaders) {
1492                                 auth = AuthenticationManager.Authenticate (authHeader, this, creds);
1493                                 if (auth != null)
1494                                         break;
1495                         }
1496                         if (auth == null)
1497                                 return false;
1498                         webHeaders [(isProxy) ? "Proxy-Authorization" : "Authorization"] = auth.Message;
1499                         authCompleted = auth.Complete;
1500                         bool is_ntlm = (auth.Module.AuthenticationType == "NTLM");
1501                         if (is_ntlm)
1502                                 ntlm_auth_state = (NtlmAuthState)((int) ntlm_auth_state + 1);
1503                         return true;
1504                 }
1505
1506                 // Returns true if redirected
1507                 bool CheckFinalStatus (WebAsyncResult result)
1508                 {
1509                         if (result.GotException) {
1510                                 bodyBuffer = null;
1511                                 throw result.Exception;
1512                         }
1513
1514                         Exception throwMe = result.Exception;
1515
1516                         HttpWebResponse resp = result.Response;
1517                         WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
1518                         HttpStatusCode code = 0;
1519                         if (throwMe == null && webResponse != null) {
1520                                 code = webResponse.StatusCode;
1521                                 if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
1522                                      (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
1523                                         if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
1524                                                 // Keep the written body, so it can be rewritten in the retry
1525                                                 if (InternalAllowBuffering) {
1526                                                         // NTLM: This is to avoid sending data in the 'challenge' request
1527                                                         // We save it in the first request (first 401), don't send anything
1528                                                         // in the challenge request and send it in the response request along
1529                                                         // with the buffers kept form the first request.
1530                                                         if (ntlm_auth_state != NtlmAuthState.Response) {
1531                                                                 bodyBuffer = writeStream.WriteBuffer;
1532                                                                 bodyBufferLength = writeStream.WriteBufferLength;
1533                                                         }
1534                                                         return true;
1535                                                 } else if (method != "PUT" && method != "POST") {
1536                                                         bodyBuffer = null;
1537                                                         return true;
1538                                                 }
1539
1540                                                 if (!ThrowOnError)
1541                                                         return false;
1542
1543                                                 writeStream.InternalClose ();
1544                                                 writeStream = null;
1545                                                 webResponse.Close ();
1546                                                 webResponse = null;
1547                                                 bodyBuffer = null;
1548
1549                                                 throw new WebException ("This request requires buffering " +
1550                                                                         "of data for authentication or " +
1551                                                                         "redirection to be sucessful.");
1552                                         }
1553                                 }
1554
1555                                 bodyBuffer = null;
1556                                 if ((int) code >= 400) {
1557                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1558                                                                     (int) code, webResponse.StatusDescription);
1559                                         throwMe = new WebException (err, null, protoError, webResponse);
1560                                         webResponse.ReadAll ();
1561                                 } else if ((int) code == 304 && allowAutoRedirect) {
1562                                         string err = String.Format ("The remote server returned an error: ({0}) {1}.",
1563                                                                     (int) code, webResponse.StatusDescription);
1564                                         throwMe = new WebException (err, null, protoError, webResponse);
1565                                 } else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
1566                                         throwMe = new WebException ("Max. redirections exceeded.", null,
1567                                                                     protoError, webResponse);
1568                                         webResponse.ReadAll ();
1569                                 }
1570                         }
1571
1572                         bodyBuffer = null;
1573                         if (throwMe == null) {
1574                                 bool b = false;
1575                                 int c = (int) code;
1576                                 if (allowAutoRedirect && c >= 300) {
1577                                         if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
1578                                                 bodyBuffer = writeStream.WriteBuffer;
1579                                                 bodyBufferLength = writeStream.WriteBufferLength;
1580                                         }
1581                                         b = Redirect (result, code);
1582                                         if (b && ntlm_auth_state != 0)
1583                                                 ntlm_auth_state = 0;
1584                                 }
1585
1586                                 if (resp != null && c >= 300 && c != 304)
1587                                         resp.ReadAll ();
1588
1589                                 return b;
1590                         }
1591
1592                         if (!ThrowOnError)
1593                                 return false;
1594
1595                         if (writeStream != null) {
1596                                 writeStream.InternalClose ();
1597                                 writeStream = null;
1598                         }
1599
1600                         webResponse = null;
1601
1602                         throw throwMe;
1603                 }
1604         }
1605 }
1606