mcs/class/System/System.Net/WebClient.cs

   1 //
   2 // System.Net.WebClient
   3 //
   4 // Authors:
   5 //      Lawrence Pit (loz@cable.a2000.nl)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //      Atsushi Enomoto (atsushi@ximian.com)
   8 //      Miguel de Icaza (miguel@ximian.com)
   9 //
  10 // Copyright 2003 Ximian, Inc. (http://www.ximian.com)
  11 // Copyright 2006, 2007 Novell, Inc. (http://www.novell.com)
  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 // Notes on CancelAsync and Async methods:
  35 //
  36 //    WebClient.CancelAsync is implemented by calling Thread.Interrupt
  37 //    in our helper thread.   The various async methods have to cancel
  38 //    any ongoing requests by calling request.Abort () at that point.
  39 //    In a few places (UploadDataCore, UploadValuesCore,
  40 //    UploadFileCore) we catch the ThreadInterruptedException and
  41 //    abort the request there.
  42 //
  43 //    Higher level routines (the async callbacks) also need to catch
  44 //    the exception and raise the OnXXXXCompleted events there with
  45 //    the "canceled" flag set to true.
  46 //
  47 //    In a few other places where these helper routines are not used
  48 //    (OpenReadAsync for example) catching the ThreadAbortException
  49 //    also must abort the request.
  50 //
  51 //    The Async methods currently differ in their implementation from
  52 //    the .NET implementation in that we manually catch any other
  53 //    exceptions and correctly raise the OnXXXXCompleted passing the
  54 //    Exception that caused the problem.   The .NET implementation
  55 //    does not seem to have a mechanism to flag errors that happen
  56 //    during downloads though.    We do this because we still need to
  57 //    catch the exception on these helper threads, or we would
  58 //    otherwise kill the application (on the 2.x profile, uncaught
  59 //    exceptions in threads terminate the application).
  60 //
  61 using System;
  62 using System.Collections.Specialized;
  63 using System.ComponentModel;
  64 using System.IO;
  65 using System.Runtime.InteropServices;
  66 using System.Runtime.Serialization;
  67 using System.Text;
  68 using System.Threading;
  69 #if NET_2_0
  70 using System.Net.Cache;
  71 #endif
  72
  73 namespace System.Net
  74 {
  75         [ComVisible(true)]
  76         public
  77 #if !NET_2_0
  78         sealed
  79 #endif
  80         class WebClient : Component
  81         {
  82                 static readonly string urlEncodedCType = "application/x-www-form-urlencoded";
  83                 static byte [] hexBytes;
  84                 ICredentials credentials;
  85                 WebHeaderCollection headers;
  86                 WebHeaderCollection responseHeaders;
  87                 Uri baseAddress;
  88                 string baseString;
  89                 NameValueCollection queryString;
  90                 bool is_busy;
  91 #if NET_2_0
  92                 bool async;
  93                 Thread async_thread;
  94                 Encoding encoding = Encoding.Default;
  95                 IWebProxy proxy;
  96 #endif
  97
  98                 // Constructors
  99                 static WebClient ()
 100                 {
 101                         hexBytes = new byte [16];
 102                         int index = 0;
 103                         for (int i = '0'; i <= '9'; i++, index++)
 104                                 hexBytes [index] = (byte) i;
 105
 106                         for (int i = 'A'; i <= 'F'; i++, index++)
 107                                 hexBytes [index] = (byte) i;
 108                 }
 109
 110                 public WebClient ()
 111                 {
 112                 }
 113
 114                 // Properties
 115
 116                 public string BaseAddress {
 117                         get {
 118                                 if (baseString == null) {
 119                                         if (baseAddress == null)
 120                                                 return "";
 121                                 }
 122
 123                                 baseString = baseAddress.ToString ();
 124                                 return baseString;
 125                         }
 126
 127                         set {
 128                                 if (value == null || value == "") {
 129                                         baseAddress = null;
 130                                 } else {
 131                                         baseAddress = new Uri (value);
 132                                 }
 133                         }
 134                 }
 135
 136 #if NET_2_0
 137                 static Exception GetMustImplement ()
 138                 {
 139                         return new NotImplementedException ();
 140                 }
 141
 142                 [MonoTODO]
 143                 public RequestCachePolicy CachePolicy
 144                 {
 145                         get {
 146                                 throw GetMustImplement ();
 147                         }
 148                         set {
 149                                 throw GetMustImplement ();
 150                         }
 151                 }
 152
 153                 [MonoTODO]
 154                 public bool UseDefaultCredentials
 155                 {
 156                         get {
 157                                 throw GetMustImplement ();
 158                         }
 159                         set {
 160                                 throw GetMustImplement ();
 161                         }
 162                 }
 163 #endif
 164
 165                 public ICredentials Credentials {
 166                         get { return credentials; }
 167                         set { credentials = value; }
 168                 }
 169
 170                 public WebHeaderCollection Headers {
 171                         get {
 172                                 if (headers == null)
 173                                         headers = new WebHeaderCollection ();
 174
 175                                 return headers;
 176                         }
 177                         set { headers = value; }
 178                 }
 179
 180                 public NameValueCollection QueryString {
 181                         get {
 182                                 if (queryString == null)
 183                                         queryString = new NameValueCollection ();
 184
 185                                 return queryString;
 186                         }
 187                         set { queryString = value; }
 188                 }
 189
 190                 public WebHeaderCollection ResponseHeaders {
 191                         get { return responseHeaders; }
 192                 }
 193
 194 #if NET_2_0
 195                 public Encoding Encoding {
 196                         get { return encoding; }
 197                         set {
 198                                 if (value == null)
 199                                         throw new ArgumentNullException ("value");
 200                                 encoding = value;
 201                         }
 202                 }
 203
 204                 public IWebProxy Proxy {
 205                         get { return proxy; }
 206                         set { proxy = value; }
 207                 }
 208 #endif
 209
 210 #if NET_2_0
 211                 public bool IsBusy {
 212                         get { return is_busy; }
 213                 }
 214 #else
 215                 bool IsBusy {
 216                         get { return is_busy; }
 217                 }
 218 #endif
 219
 220                 // Methods
 221
 222                 void CheckBusy ()
 223                 {
 224                         if (IsBusy)
 225                                 throw new NotSupportedException ("WebClient does not support conccurent I/O operations.");
 226                 }
 227
 228                 void SetBusy ()
 229                 {
 230                         lock (this) {
 231                                 CheckBusy ();
 232                                 is_busy = true;
 233                         }
 234                 }
 235
 236                 //   DownloadData
 237
 238                 public byte [] DownloadData (string address)
 239                 {
 240 #if NET_2_0
 241                         if (address == null)
 242                                 throw new ArgumentNullException ("address");
 243 #endif
 244
 245                         return DownloadData (CreateUri (address));
 246                 }
 247
 248 #if NET_2_0
 249                 public
 250 #endif
 251                 byte [] DownloadData (Uri address)
 252                 {
 253 #if NET_2_0
 254                         if (address == null)
 255                                 throw new ArgumentNullException ("address");
 256 #endif
 257
 258                         try {
 259                                 SetBusy ();
 260 #if NET_2_0
 261                                 async = false;
 262 #endif
 263                                 return DownloadDataCore (address, null);
 264                         } finally {
 265                                 is_busy = false;
 266                         }
 267                 }
 268
 269                 byte [] DownloadDataCore (Uri address, object userToken)
 270                 {
 271                         WebRequest request = null;
 272
 273                         try {
 274                                 request = SetupRequest (address);
 275                                 WebResponse response = request.GetResponse ();
 276                                 Stream st = ProcessResponse (response);
 277                                 return ReadAll (st, (int) response.ContentLength, userToken);
 278                         } catch (ThreadInterruptedException){
 279                                 if (request != null)
 280                                         request.Abort ();
 281                                 throw;
 282                         } catch (Exception ex) {
 283                                 throw new WebException ("An error occurred " +
 284                                         "performing a WebClient request.", ex);
 285                         }
 286                 }
 287
 288                 //   DownloadFile
 289
 290                 public void DownloadFile (string address, string fileName)
 291                 {
 292 #if NET_2_0
 293                         if (address == null)
 294                                 throw new ArgumentNullException ("address");
 295 #endif
 296
 297                         DownloadFile (CreateUri (address), fileName);
 298                 }
 299
 300 #if NET_2_0
 301                 public
 302 #endif
 303                 void DownloadFile (Uri address, string fileName)
 304                 {
 305 #if NET_2_0
 306                         if (address == null)
 307                                 throw new ArgumentNullException ("address");
 308                         if (fileName == null)
 309                                 throw new ArgumentNullException ("fileName");
 310 #endif
 311
 312                         try {
 313                                 SetBusy ();
 314 #if NET_2_0
 315                                 async = false;
 316 #endif
 317                                 DownloadFileCore (address, fileName, null);
 318                         } catch (Exception ex) {
 319                                 throw new WebException ("An error occurred " +
 320                                         "performing a WebClient request.", ex);
 321                         } finally {
 322                                 is_busy = false;
 323                         }
 324                 }
 325
 326                 void DownloadFileCore (Uri address, string fileName, object userToken)
 327                 {
 328                         WebRequest request = null;
 329
 330                         using (FileStream f = new FileStream (fileName, FileMode.Create)) {
 331                                 try {
 332                                         request = SetupRequest (address);
 333                                         WebResponse response = request.GetResponse ();
 334                                         Stream st = ProcessResponse (response);
 335
 336                                         int cLength = (int) response.ContentLength;
 337                                         int length = (cLength <= -1 || cLength > 32*1024) ? 32*1024 : cLength;
 338                                         byte [] buffer = new byte [length];
 339
 340                                         int nread = 0;
 341 #if NET_2_0
 342                                         long notify_total = 0;
 343 #endif
 344                                         while ((nread = st.Read (buffer, 0, length)) != 0){
 345 #if NET_2_0
 346                                                 if (async){
 347                                                         notify_total += nread;
 348                                                         OnDownloadProgressChanged (
 349                                                                 new DownloadProgressChangedEventArgs (notify_total, response.ContentLength, userToken));
 350
 351                                                 }
 352 #endif
 353                                                 f.Write (buffer, 0, nread);
 354                                         }
 355                                 } catch (ThreadInterruptedException){
 356                                         if (request != null)
 357                                                 request.Abort ();
 358                                         throw;
 359                                 }
 360                         }
 361                 }
 362
 363                 //   OpenRead
 364
 365                 public Stream OpenRead (string address)
 366                 {
 367 #if NET_2_0
 368                         if (address == null)
 369                                 throw new ArgumentNullException ("address");
 370 #endif
 371
 372                         return OpenRead (CreateUri (address));
 373                 }
 374
 375 #if NET_2_0
 376                 public
 377 #endif
 378                 Stream OpenRead (Uri address)
 379                 {
 380 #if NET_2_0
 381                         if (address == null)
 382                                 throw new ArgumentNullException ("address");
 383 #endif
 384
 385                         WebRequest request = null;
 386                         try {
 387                                 SetBusy ();
 388 #if NET_2_0
 389                                 async = false;
 390 #endif
 391                                 request = SetupRequest (address);
 392                                 WebResponse response = request.GetResponse ();
 393                                 return ProcessResponse (response);
 394                         } catch (Exception ex) {
 395                                 throw new WebException ("An error occurred " +
 396                                         "performing a WebClient request.", ex);
 397                         } finally {
 398                                 is_busy = false;
 399                         }
 400                 }
 401
 402                 //   OpenWrite
 403
 404                 public Stream OpenWrite (string address)
 405                 {
 406 #if NET_2_0
 407                         if (address == null)
 408                                 throw new ArgumentNullException ("address");
 409 #endif
 410
 411                         return OpenWrite (CreateUri (address));
 412                 }
 413
 414                 public Stream OpenWrite (string address, string method)
 415                 {
 416 #if NET_2_0
 417                         if (address == null)
 418                                 throw new ArgumentNullException ("address");
 419 #endif
 420
 421                         return OpenWrite (CreateUri (address), method);
 422                 }
 423
 424 #if NET_2_0
 425                 public
 426 #endif
 427                 Stream OpenWrite (Uri address)
 428                 {
 429                         return OpenWrite (address, (string) null);
 430                 }
 431
 432 #if NET_2_0
 433                 public
 434 #endif
 435                 Stream OpenWrite (Uri address, string method)
 436                 {
 437 #if NET_2_0
 438                         if (address == null)
 439                                 throw new ArgumentNullException ("address");
 440 #endif
 441
 442                         try {
 443                                 SetBusy ();
 444 #if NET_2_0
 445                                 async = false;
 446 #endif
 447                                 WebRequest request = SetupRequest (address, method, true);
 448                                 return request.GetRequestStream ();
 449                         } catch (Exception ex) {
 450                                 throw new WebException ("An error occurred " +
 451                                         "performing a WebClient request.", ex);
 452                         } finally {
 453                                 is_busy = false;
 454                         }
 455                 }
 456
 457                 private string DetermineMethod (Uri address, string method, bool is_upload)
 458                 {
 459                         if (method != null)
 460                                 return method;
 461
 462 #if NET_2_0
 463                         if (address.Scheme == Uri.UriSchemeFtp)
 464                                 return (is_upload) ? "STOR" : "RETR";
 465 #endif
 466                         return (is_upload) ? "POST" : "GET";
 467                 }
 468
 469                 //   UploadData
 470
 471                 public byte [] UploadData (string address, byte [] data)
 472                 {
 473 #if NET_2_0
 474                         if (address == null)
 475                                 throw new ArgumentNullException ("address");
 476 #endif
 477
 478                         return UploadData (CreateUri (address), data);
 479                 }
 480
 481                 public byte [] UploadData (string address, string method, byte [] data)
 482                 {
 483 #if NET_2_0
 484                         if (address == null)
 485                                 throw new ArgumentNullException ("address");
 486 #endif
 487
 488                         return UploadData (CreateUri (address), method, data);
 489                 }
 490
 491 #if NET_2_0
 492                 public
 493 #endif
 494                 byte [] UploadData (Uri address, byte [] data)
 495                 {
 496                         return UploadData (address, (string) null, data);
 497                 }
 498
 499 #if NET_2_0
 500                 public
 501 #endif
 502                 byte [] UploadData (Uri address, string method, byte [] data)
 503                 {
 504 #if NET_2_0
 505                         if (address == null)
 506                                 throw new ArgumentNullException ("address");
 507                         if (data == null)
 508                                 throw new ArgumentNullException ("data");
 509 #endif
 510
 511                         try {
 512                                 SetBusy ();
 513 #if NET_2_0
 514                                 async = false;
 515 #endif
 516                                 return UploadDataCore (address, method, data, null);
 517                         } catch (WebException) {
 518                                 throw;
 519                         } catch (Exception ex) {
 520                                 throw new WebException ("An error occurred " +
 521                                         "performing a WebClient request.", ex);
 522                         } finally {
 523                                 is_busy = false;
 524                         }
 525                 }
 526
 527                 byte [] UploadDataCore (Uri address, string method, byte [] data, object userToken)
 528                 {
 529 #if ONLY_1_1
 530                         if (address == null)
 531                                 throw new ArgumentNullException ("address");
 532                         if (data == null)
 533                                 throw new ArgumentNullException ("data");
 534 #endif
 535
 536                         WebRequest request = SetupRequest (address, method, true);
 537                         try {
 538                                 int contentLength = data.Length;
 539                                 request.ContentLength = contentLength;
 540                                 using (Stream stream = request.GetRequestStream ()) {
 541                                         stream.Write (data, 0, contentLength);
 542                                 }
 543
 544                                 WebResponse response = request.GetResponse ();
 545                                 Stream st = ProcessResponse (response);
 546                                 return ReadAll (st, (int) response.ContentLength, userToken);
 547                         } catch (ThreadInterruptedException){
 548                                 if (request != null)
 549                                         request.Abort ();
 550                                 throw;
 551                         }
 552                 }
 553
 554                 //   UploadFile
 555
 556                 public byte [] UploadFile (string address, string fileName)
 557                 {
 558 #if NET_2_0
 559                         if (address == null)
 560                                 throw new ArgumentNullException ("address");
 561 #endif
 562
 563                         return UploadFile (CreateUri (address), fileName);
 564                 }
 565
 566 #if NET_2_0
 567                 public
 568 #endif
 569                 byte [] UploadFile (Uri address, string fileName)
 570                 {
 571                         return UploadFile (address, (string) null, fileName);
 572                 }
 573
 574                 public byte [] UploadFile (string address, string method, string fileName)
 575                 {
 576                         return UploadFile (CreateUri (address), method, fileName);
 577                 }
 578
 579 #if NET_2_0
 580                 public
 581 #endif
 582                 byte [] UploadFile (Uri address, string method, string fileName)
 583                 {
 584 #if NET_2_0
 585                         if (address == null)
 586                                 throw new ArgumentNullException ("address");
 587                         if (fileName == null)
 588                                 throw new ArgumentNullException ("fileName");
 589 #endif
 590
 591                         try {
 592                                 SetBusy ();
 593 #if NET_2_0
 594                                 async = false;
 595 #endif
 596                                 return UploadFileCore (address, method, fileName, null);
 597                         } catch (Exception ex) {
 598                                 throw new WebException ("An error occurred " +
 599                                         "performing a WebClient request.", ex);
 600                         } finally {
 601                                 is_busy = false;
 602                         }
 603                 }
 604
 605                 byte [] UploadFileCore (Uri address, string method, string fileName, object userToken)
 606                 {
 607 #if ONLY_1_1
 608                         if (address == null)
 609                                 throw new ArgumentNullException ("address");
 610 #endif
 611
 612                         string fileCType = Headers ["Content-Type"];
 613                         if (fileCType != null) {
 614                                 string lower = fileCType.ToLower ();
 615                                 if (lower.StartsWith ("multipart/"))
 616                                         throw new WebException ("Content-Type cannot be set to a multipart" +
 617                                                                 " type for this request.");
 618                         } else {
 619                                 fileCType = "application/octet-stream";
 620                         }
 621
 622                         string boundary = "------------" + DateTime.Now.Ticks.ToString ("x");
 623                         Headers ["Content-Type"] = String.Format ("multipart/form-data; boundary={0}", boundary);
 624                         Stream reqStream = null;
 625                         Stream fStream = null;
 626                         byte [] resultBytes = null;
 627
 628                         fileName = Path.GetFullPath (fileName);
 629
 630                         WebRequest request = null;
 631                         try {
 632                                 fStream = File.OpenRead (fileName);
 633                                 request = SetupRequest (address, method, true);
 634                                 reqStream = request.GetRequestStream ();
 635                                 byte [] realBoundary = Encoding.ASCII.GetBytes ("--" + boundary + "\r\n");
 636                                 reqStream.Write (realBoundary, 0, realBoundary.Length);
 637                                 string partHeaders = String.Format ("Content-Disposition: form-data; " +
 638                                                                     "name=\"file\"; filename=\"{0}\"\r\n" +
 639                                                                     "Content-Type: {1}\r\n\r\n",
 640                                                                     Path.GetFileName (fileName), fileCType);
 641
 642                                 byte [] partHeadersBytes = Encoding.UTF8.GetBytes (partHeaders);
 643                                 reqStream.Write (partHeadersBytes, 0, partHeadersBytes.Length);
 644                                 int nread;
 645                                 byte [] buffer = new byte [4096];
 646                                 while ((nread = fStream.Read (buffer, 0, 4096)) != 0)
 647                                         reqStream.Write (buffer, 0, nread);
 648
 649                                 reqStream.WriteByte ((byte) '\r');
 650                                 reqStream.WriteByte ((byte) '\n');
 651                                 reqStream.Write (realBoundary, 0, realBoundary.Length);
 652                                 reqStream.Close ();
 653                                 reqStream = null;
 654                                 WebResponse response = request.GetResponse ();
 655                                 Stream st = ProcessResponse (response);
 656                                 resultBytes = ReadAll (st, (int) response.ContentLength, userToken);
 657                         } catch (ThreadInterruptedException){
 658                                 if (request != null)
 659                                         request.Abort ();
 660                                 throw;
 661                         } finally {
 662                                 if (fStream != null)
 663                                         fStream.Close ();
 664
 665                                 if (reqStream != null)
 666                                         reqStream.Close ();
 667                         }
 668
 669                         return resultBytes;
 670                 }
 671
 672                 public byte[] UploadValues (string address, NameValueCollection data)
 673                 {
 674 #if NET_2_0
 675                         if (address == null)
 676                                 throw new ArgumentNullException ("address");
 677 #endif
 678
 679                         return UploadValues (CreateUri (address), data);
 680                 }
 681
 682                 public byte[] UploadValues (string address, string method, NameValueCollection data)
 683                 {
 684 #if NET_2_0
 685                         if (address == null)
 686                                 throw new ArgumentNullException ("address");
 687 #endif
 688
 689                         return UploadValues (CreateUri (address), method, data);
 690                 }
 691
 692 #if NET_2_0
 693                 public
 694 #endif
 695                 byte[] UploadValues (Uri address, NameValueCollection data)
 696                 {
 697                         return UploadValues (address, (string) null, data);
 698                 }
 699
 700 #if NET_2_0
 701                 public
 702 #endif
 703                 byte[] UploadValues (Uri address, string method, NameValueCollection data)
 704                 {
 705 #if NET_2_0
 706                         if (address == null)
 707                                 throw new ArgumentNullException ("address");
 708                         if (data == null)
 709                                 throw new ArgumentNullException ("data");
 710 #endif
 711
 712                         try {
 713                                 SetBusy ();
 714 #if NET_2_0
 715                                 async = false;
 716 #endif
 717                                 return UploadValuesCore (address, method, data, null);
 718                         } catch (Exception ex) {
 719                                 throw new WebException ("An error occurred " +
 720                                         "performing a WebClient request.", ex);
 721                         } finally {
 722                                 is_busy = false;
 723                         }
 724                 }
 725
 726                 byte[] UploadValuesCore (Uri uri, string method, NameValueCollection data, object userToken)
 727                 {
 728 #if ONLY_1_1
 729                         if (data == null)
 730                                 throw new ArgumentNullException ("data");
 731 #endif
 732
 733                         string cType = Headers ["Content-Type"];
 734                         if (cType != null && String.Compare (cType, urlEncodedCType, true) != 0)
 735                                 throw new WebException ("Content-Type header cannot be changed from its default " +
 736                                                         "value for this request.");
 737
 738                         Headers ["Content-Type"] = urlEncodedCType;
 739                         WebRequest request = SetupRequest (uri, method, true);
 740                         try {
 741                                 Stream rqStream = request.GetRequestStream ();
 742                                 MemoryStream tmpStream = new MemoryStream ();
 743                                 foreach (string key in data) {
 744                                         byte [] bytes = Encoding.UTF8.GetBytes (key);
 745                                         UrlEncodeAndWrite (tmpStream, bytes);
 746                                         tmpStream.WriteByte ((byte) '=');
 747                                         bytes = Encoding.UTF8.GetBytes (data [key]);
 748                                         UrlEncodeAndWrite (tmpStream, bytes);
 749                                         tmpStream.WriteByte ((byte) '&');
 750                                 }
 751
 752                                 int length = (int) tmpStream.Length;
 753                                 if (length > 0)
 754                                         tmpStream.SetLength (--length); // remove trailing '&'
 755
 756                                 byte [] buf = tmpStream.GetBuffer ();
 757                                 rqStream.Write (buf, 0, length);
 758                                 rqStream.Close ();
 759                                 tmpStream.Close ();
 760
 761                                 WebResponse response = request.GetResponse ();
 762                                 Stream st = ProcessResponse (response);
 763                                 return ReadAll (st, (int) response.ContentLength, userToken);
 764                         } catch (ThreadInterruptedException) {
 765                                 request.Abort ();
 766                                 throw;
 767                         }
 768                 }
 769
 770 #if NET_2_0
 771                 public string DownloadString (string address)
 772                 {
 773                         if (address == null)
 774                                 throw new ArgumentNullException ("address");
 775
 776                         return encoding.GetString (DownloadData (CreateUri (address)));
 777                 }
 778
 779                 public string DownloadString (Uri address)
 780                 {
 781                         if (address == null)
 782                                 throw new ArgumentNullException ("address");
 783
 784                         return encoding.GetString (DownloadData (CreateUri (address)));
 785                 }
 786
 787                 public string UploadString (string address, string data)
 788                 {
 789                         if (address == null)
 790                                 throw new ArgumentNullException ("address");
 791                         if (data == null)
 792                                 throw new ArgumentNullException ("data");
 793
 794                         byte [] resp = UploadData (address, encoding.GetBytes (data));
 795                         return encoding.GetString (resp);
 796                 }
 797
 798                 public string UploadString (string address, string method, string data)
 799                 {
 800                         if (address == null)
 801                                 throw new ArgumentNullException ("address");
 802                         if (data == null)
 803                                 throw new ArgumentNullException ("data");
 804
 805                         byte [] resp = UploadData (address, method, encoding.GetBytes (data));
 806                         return encoding.GetString (resp);
 807                 }
 808
 809                 public string UploadString (Uri address, string data)
 810                 {
 811                         if (address == null)
 812                                 throw new ArgumentNullException ("address");
 813                         if (data == null)
 814                                 throw new ArgumentNullException ("data");
 815
 816                         byte [] resp = UploadData (address, encoding.GetBytes (data));
 817                         return encoding.GetString (resp);
 818                 }
 819
 820                 public string UploadString (Uri address, string method, string data)
 821                 {
 822                         if (address == null)
 823                                 throw new ArgumentNullException ("address");
 824                         if (data == null)
 825                                 throw new ArgumentNullException ("data");
 826
 827                         byte [] resp = UploadData (address, method, encoding.GetBytes (data));
 828                         return encoding.GetString (resp);
 829                 }
 830
 831                 public event DownloadDataCompletedEventHandler DownloadDataCompleted;
 832                 public event AsyncCompletedEventHandler DownloadFileCompleted;
 833                 public event DownloadProgressChangedEventHandler DownloadProgressChanged;
 834                 public event DownloadStringCompletedEventHandler DownloadStringCompleted;
 835                 public event OpenReadCompletedEventHandler OpenReadCompleted;
 836                 public event OpenWriteCompletedEventHandler OpenWriteCompleted;
 837                 public event UploadDataCompletedEventHandler UploadDataCompleted;
 838                 public event UploadFileCompletedEventHandler UploadFileCompleted;
 839                 public event UploadProgressChangedEventHandler UploadProgressChanged;
 840                 public event UploadStringCompletedEventHandler UploadStringCompleted;
 841                 public event UploadValuesCompletedEventHandler UploadValuesCompleted;
 842 #endif
 843
 844                 Uri CreateUri (string address)
 845                 {
 846 #if ONLY_1_1
 847                         try {
 848                                 return MakeUri (address);
 849                         } catch (Exception ex) {
 850                                 throw new WebException ("An error occurred " +
 851                                         "performing a WebClient request.", ex);
 852                         }
 853 #else
 854                         return MakeUri (address);
 855 #endif
 856                 }
 857
 858 #if NET_2_0
 859                 Uri CreateUri (Uri address)
 860                 {
 861                         string query = address.Query;
 862                         if (String.IsNullOrEmpty (query))
 863                                 query = GetQueryString (true);
 864
 865                         if (baseAddress == null && query == null)
 866                                 return address;
 867
 868                         if (baseAddress == null)
 869                                 return new Uri (address.ToString () + query, (query != null));
 870
 871                         if (query == null)
 872                                 return new Uri (baseAddress, address.ToString ());
 873
 874                         return new Uri (baseAddress, address.ToString () + query, (query != null));
 875
 876                 }
 877 #endif
 878
 879                 string GetQueryString (bool add_qmark)
 880                 {
 881                         if (queryString == null || queryString.Count == 0)
 882                                 return null;
 883
 884                         StringBuilder sb = new StringBuilder ();
 885                         if (add_qmark)
 886                                 sb.Append ('?');
 887
 888                         foreach (string key in queryString)
 889                                 sb.AppendFormat ("{0}={1}&", key, UrlEncode (queryString [key]));
 890
 891                         if (sb.Length != 0)
 892                                 sb.Length--; // removes last '&' or the '?' if empty.
 893
 894                         if (sb.Length == 0)
 895                                 return null;
 896
 897                         return sb.ToString ();
 898                 }
 899
 900                 Uri MakeUri (string path)
 901                 {
 902                         string query = GetQueryString (true);
 903                         if (baseAddress == null && query == null) {
 904                                 try {
 905                                         return new Uri (path);
 906 #if NET_2_0
 907                                 } catch (ArgumentNullException) {
 908                                         path = Path.GetFullPath (path);
 909                                         return new Uri ("file://" + path);
 910 #endif
 911                                 } catch (UriFormatException) {
 912                                         path = Path.GetFullPath (path);
 913                                         return new Uri ("file://" + path);
 914                                 }
 915                         }
 916
 917                         if (baseAddress == null)
 918                                 return new Uri (path + query, (query != null));
 919
 920                         if (query == null)
 921                                 return new Uri (baseAddress, path);
 922
 923                         return new Uri (baseAddress, path + query, (query != null));
 924                 }
 925
 926                 WebRequest SetupRequest (Uri uri)
 927                 {
 928                         WebRequest request = WebRequest.Create (uri);
 929 #if NET_2_0
 930                         if (Proxy != null)
 931                                 request.Proxy = Proxy;
 932 #endif
 933                         request.Credentials = credentials;
 934
 935                         // Special headers. These are properties of HttpWebRequest.
 936                         // What do we do with other requests differnt from HttpWebRequest?
 937                         if (headers != null && headers.Count != 0 && (request is HttpWebRequest)) {
 938                                 HttpWebRequest req = (HttpWebRequest) request;
 939                                 string expect = headers ["Expect"];
 940                                 string contentType = headers ["Content-Type"];
 941                                 string accept = headers ["Accept"];
 942                                 string connection = headers ["Connection"];
 943                                 string userAgent = headers ["User-Agent"];
 944                                 string referer = headers ["Referer"];
 945                                 headers.RemoveInternal ("Expect");
 946                                 headers.RemoveInternal ("Content-Type");
 947                                 headers.RemoveInternal ("Accept");
 948                                 headers.RemoveInternal ("Connection");
 949                                 headers.RemoveInternal ("Referer");
 950                                 headers.RemoveInternal ("User-Agent");
 951                                 request.Headers = headers;
 952
 953                                 if (expect != null && expect.Length > 0)
 954                                         req.Expect = expect;
 955
 956                                 if (accept != null && accept.Length > 0)
 957                                         req.Accept = accept;
 958
 959                                 if (contentType != null && contentType.Length > 0)
 960                                         req.ContentType = contentType;
 961
 962                                 if (connection != null && connection.Length > 0)
 963                                         req.Connection = connection;
 964
 965                                 if (userAgent != null && userAgent.Length > 0)
 966                                         req.UserAgent = userAgent;
 967
 968                                 if (referer != null && referer.Length > 0)
 969                                         req.Referer = referer;
 970                         }
 971
 972                         responseHeaders = null;
 973                         return request;
 974                 }
 975
 976                 WebRequest SetupRequest (Uri uri, string method, bool is_upload)
 977                 {
 978                         WebRequest request = SetupRequest (uri);
 979                         request.Method = DetermineMethod (uri, method, is_upload);
 980                         return request;
 981                 }
 982
 983                 Stream ProcessResponse (WebResponse response)
 984                 {
 985                         responseHeaders = response.Headers;
 986                         return response.GetResponseStream ();
 987                 }
 988
 989                 byte [] ReadAll (Stream stream, int length, object userToken)
 990                 {
 991                         MemoryStream ms = null;
 992
 993                         bool nolength = (length == -1);
 994                         int size = ((nolength) ? 8192 : length);
 995                         if (nolength)
 996                                 ms = new MemoryStream ();
 997
 998 //                      long total = 0;
 999                         int nread = 0;
1000                         int offset = 0;
1001                         byte [] buffer = new byte [size];
1002                         while ((nread = stream.Read (buffer, offset, size)) != 0) {
1003                                 if (nolength) {
1004                                         ms.Write (buffer, 0, nread);
1005                                 } else {
1006                                         offset += nread;
1007                                         size -= nread;
1008                                 }
1009 #if NET_2_0
1010                                 if (async){
1011 //                                      total += nread;
1012                                         OnDownloadProgressChanged (new DownloadProgressChangedEventArgs (nread, length, userToken));
1013                                 }
1014 #endif
1015                         }
1016
1017                         if (nolength)
1018                                 return ms.ToArray ();
1019
1020                         return buffer;
1021                 }
1022
1023                 string UrlEncode (string str)
1024                 {
1025                         StringBuilder result = new StringBuilder ();
1026
1027                         int len = str.Length;
1028                         for (int i = 0; i < len; i++) {
1029                                 char c = str [i];
1030                                 if (c == ' ')
1031                                         result.Append ('+');
1032                                 else if ((c < '0' && c != '-' && c != '.') ||
1033                                          (c < 'A' && c > '9') ||
1034                                          (c > 'Z' && c < 'a' && c != '_') ||
1035                                          (c > 'z')) {
1036                                         result.Append ('%');
1037                                         int idx = ((int) c) >> 4;
1038                                         result.Append ((char) hexBytes [idx]);
1039                                         idx = ((int) c) & 0x0F;
1040                                         result.Append ((char) hexBytes [idx]);
1041                                 } else {
1042                                         result.Append (c);
1043                                 }
1044                         }
1045
1046                         return result.ToString ();
1047                 }
1048
1049                 static void UrlEncodeAndWrite (Stream stream, byte [] bytes)
1050                 {
1051                         if (bytes == null)
1052                                 return;
1053
1054                         int len = bytes.Length;
1055                         if (len == 0)
1056                                 return;
1057
1058                         for (int i = 0; i < len; i++) {
1059                                 char c = (char) bytes [i];
1060                                 if (c == ' ')
1061                                         stream.WriteByte ((byte) '+');
1062                                 else if ((c < '0' && c != '-' && c != '.') ||
1063                                          (c < 'A' && c > '9') ||
1064                                          (c > 'Z' && c < 'a' && c != '_') ||
1065                                          (c > 'z')) {
1066                                         stream.WriteByte ((byte) '%');
1067                                         int idx = ((int) c) >> 4;
1068                                         stream.WriteByte (hexBytes [idx]);
1069                                         idx = ((int) c) & 0x0F;
1070                                         stream.WriteByte (hexBytes [idx]);
1071                                 } else {
1072                                         stream.WriteByte ((byte) c);
1073                                 }
1074                         }
1075                 }
1076
1077 #if NET_2_0
1078                 public void CancelAsync ()
1079                 {
1080                         lock (this){
1081                                 if (async_thread == null)
1082                                         return;
1083
1084                                 //
1085                                 // We first flag things as done, in case the Interrupt hangs
1086                                 // or the thread decides to hang in some other way inside the
1087                                 // event handlers, or if we are stuck somewhere else.  This
1088                                 // ensures that the WebClient object is reusable immediately
1089                                 //
1090                                 Thread t = async_thread;
1091                                 CompleteAsync ();
1092                                 t.Interrupt ();
1093                         }
1094                 }
1095
1096                 void CompleteAsync ()
1097                 {
1098                         lock (this){
1099                                 is_busy = false;
1100                                 async_thread = null;
1101                         }
1102                 }
1103
1104                 //    DownloadDataAsync
1105
1106                 public void DownloadDataAsync (Uri address)
1107                 {
1108                         DownloadDataAsync (address, null);
1109                 }
1110
1111                 public void DownloadDataAsync (Uri address, object userToken)
1112                 {
1113                         if (address == null)
1114                                 throw new ArgumentNullException ("address");
1115
1116                         lock (this) {
1117                                 SetBusy ();
1118                                 async = true;
1119
1120                                 async_thread = new Thread (delegate (object state) {
1121                                         object [] args = (object []) state;
1122                                         try {
1123                                                 byte [] data = DownloadDataCore ((Uri) args [0], args [1]);
1124                                                 OnDownloadDataCompleted (
1125                                                         new DownloadDataCompletedEventArgs (data, null, false, args [1]));
1126                                         } catch (ThreadInterruptedException){
1127                                                 OnDownloadDataCompleted (
1128                                                         new DownloadDataCompletedEventArgs (null, null, true, args [1]));
1129                                                 throw;
1130                                         } catch (Exception e){
1131                                                 OnDownloadDataCompleted (
1132                                                         new DownloadDataCompletedEventArgs (null, e, false, args [1]));
1133                                         }
1134                                 });
1135                                 object [] cb_args = new object [] {address, userToken};
1136                                 async_thread.Start (cb_args);
1137                         }
1138                 }
1139
1140                 //    DownloadFileAsync
1141
1142                 public void DownloadFileAsync (Uri address, string fileName)
1143                 {
1144                         DownloadFileAsync (address, fileName, null);
1145                 }
1146
1147                 public void DownloadFileAsync (Uri address, string fileName, object userToken)
1148                 {
1149                         if (address == null)
1150                                 throw new ArgumentNullException ("address");
1151                         if (fileName == null)
1152                                 throw new ArgumentNullException ("fileName");
1153
1154                         lock (this) {
1155                                 SetBusy ();
1156                                 async = true;
1157
1158                                 async_thread = new Thread (delegate (object state) {
1159                                         object [] args = (object []) state;
1160                                         try {
1161                                                 DownloadFileCore ((Uri) args [0], (string) args [1], args [2]);
1162                                                 OnDownloadFileCompleted (
1163                                                         new AsyncCompletedEventArgs (null, false, args [2]));
1164                                         } catch (ThreadInterruptedException){
1165                                                 OnDownloadFileCompleted (
1166                                                         new AsyncCompletedEventArgs (null, true, args [2]));
1167                                         } catch (Exception e){
1168                                                 OnDownloadFileCompleted (
1169                                                         new AsyncCompletedEventArgs (e, false, args [2]));
1170                                         }});
1171                                 object [] cb_args = new object [] {address, fileName, userToken};
1172                                 async_thread.Start (cb_args);
1173                         }
1174                 }
1175
1176                 //    DownloadStringAsync
1177
1178                 public void DownloadStringAsync (Uri address)
1179                 {
1180                         DownloadStringAsync (address, null);
1181                 }
1182
1183                 public void DownloadStringAsync (Uri address, object userToken)
1184                 {
1185                         if (address == null)
1186                                 throw new ArgumentNullException ("address");
1187
1188                         lock (this) {
1189                                 SetBusy ();
1190                                 async = true;
1191
1192                                 async_thread = new Thread (delegate (object state) {
1193                                         object [] args = (object []) state;
1194                                         try {
1195                                                 string data = encoding.GetString (DownloadDataCore ((Uri) args [0], args [1]));
1196                                                 OnDownloadStringCompleted (
1197                                                         new DownloadStringCompletedEventArgs (data, null, false, args [1]));
1198                                         } catch (ThreadInterruptedException){
1199                                                 OnDownloadStringCompleted (
1200                                                         new DownloadStringCompletedEventArgs (null, null, true, args [1]));
1201                                         } catch (Exception e){
1202                                                 OnDownloadStringCompleted (
1203                                                         new DownloadStringCompletedEventArgs (null, e, false, args [1]));
1204                                         }});
1205                                 object [] cb_args = new object [] {address, userToken};
1206                                 async_thread.Start (cb_args);
1207                         }
1208                 }
1209
1210                 //    OpenReadAsync
1211
1212                 public void OpenReadAsync (Uri address)
1213                 {
1214                         OpenReadAsync (address, null);
1215                 }
1216
1217                 public void OpenReadAsync (Uri address, object userToken)
1218                 {
1219                         if (address == null)
1220                                 throw new ArgumentNullException ("address");
1221
1222                         lock (this) {
1223                                 SetBusy ();
1224                                 async = true;
1225
1226                                 async_thread = new Thread (delegate (object state) {
1227                                         object [] args = (object []) state;
1228                                         WebRequest request = null;
1229                                         try {
1230                                                 request = SetupRequest ((Uri) args [0]);
1231                                                 WebResponse response = request.GetResponse ();
1232                                                 Stream stream = ProcessResponse (response);
1233                                                 OnOpenReadCompleted (
1234                                                         new OpenReadCompletedEventArgs (stream, null, false, args [1]));
1235                                         } catch (ThreadInterruptedException){
1236                                                 if (request != null)
1237                                                         request.Abort ();
1238
1239                                                 OnOpenReadCompleted (new OpenReadCompletedEventArgs (null, null, true, args [1]));
1240                                         } catch (Exception e){
1241                                                 OnOpenReadCompleted (new OpenReadCompletedEventArgs (null, e, false, args [1]));
1242                                         } });
1243                                 object [] cb_args = new object [] {address, userToken};
1244                                 async_thread.Start (cb_args);
1245                         }
1246                 }
1247
1248                 //    OpenWriteAsync
1249
1250                 public void OpenWriteAsync (Uri address)
1251                 {
1252                         OpenWriteAsync (address, null);
1253                 }
1254
1255                 public void OpenWriteAsync (Uri address, string method)
1256                 {
1257                         OpenWriteAsync (address, method, null);
1258                 }
1259
1260                 public void OpenWriteAsync (Uri address, string method, object userToken)
1261                 {
1262                         if (address == null)
1263                                 throw new ArgumentNullException ("address");
1264
1265                         lock (this) {
1266                                 SetBusy ();
1267                                 async = true;
1268
1269                                 async_thread = new Thread (delegate (object state) {
1270                                         object [] args = (object []) state;
1271                                         WebRequest request = null;
1272                                         try {
1273                                                 request = SetupRequest ((Uri) args [0], (string) args [1], true);
1274                                                 Stream stream = request.GetRequestStream ();
1275                                                 OnOpenWriteCompleted (
1276                                                         new OpenWriteCompletedEventArgs (stream, null, false, args [2]));
1277                                         } catch (ThreadInterruptedException){
1278                                                 if (request != null)
1279                                                         request.Abort ();
1280                                                 OnOpenWriteCompleted (
1281                                                         new OpenWriteCompletedEventArgs (null, null, true, args [2]));
1282                                         } catch (Exception e){
1283                                                 OnOpenWriteCompleted (
1284                                                         new OpenWriteCompletedEventArgs (null, e, false, args [2]));
1285                                         }});
1286                                 object [] cb_args = new object [] {address, method, userToken};
1287                                 async_thread.Start (cb_args);
1288                         }
1289                 }
1290
1291                 //    UploadDataAsync
1292
1293                 public void UploadDataAsync (Uri address, byte [] data)
1294                 {
1295                         UploadDataAsync (address, null, data);
1296                 }
1297
1298                 public void UploadDataAsync (Uri address, string method, byte [] data)
1299                 {
1300                         UploadDataAsync (address, method, data, null);
1301                 }
1302
1303                 public void UploadDataAsync (Uri address, string method, byte [] data, object userToken)
1304                 {
1305                         if (address == null)
1306                                 throw new ArgumentNullException ("address");
1307                         if (data == null)
1308                                 throw new ArgumentNullException ("data");
1309
1310                         lock (this) {
1311                                 SetBusy ();
1312                                 async = true;
1313
1314                                 async_thread = new Thread (delegate (object state) {
1315                                         object [] args = (object []) state;
1316                                         byte [] data2;
1317
1318                                         try {
1319                                                 data2 = UploadDataCore ((Uri) args [0], (string) args [1], (byte []) args [2], args [3]);
1320
1321                                                 OnUploadDataCompleted (
1322                                                         new UploadDataCompletedEventArgs (data2, null, false, args [3]));
1323                                         } catch (ThreadInterruptedException){
1324                                                 OnUploadDataCompleted (
1325                                                         new UploadDataCompletedEventArgs (null, null, true, args [3]));
1326                                         } catch (Exception e){
1327                                                 OnUploadDataCompleted (
1328                                                         new UploadDataCompletedEventArgs (null, e, false, args [3]));
1329                                         }});
1330                                 object [] cb_args = new object [] {address, method, data,  userToken};
1331                                 async_thread.Start (cb_args);
1332                         }
1333                 }
1334
1335                 //    UploadFileAsync
1336
1337                 public void UploadFileAsync (Uri address, string fileName)
1338                 {
1339                         UploadFileAsync (address, null, fileName);
1340                 }
1341
1342                 public void UploadFileAsync (Uri address, string method, string fileName)
1343                 {
1344                         UploadFileAsync (address, method, fileName, null);
1345                 }
1346
1347                 public void UploadFileAsync (Uri address, string method, string fileName, object userToken)
1348                 {
1349                         if (address == null)
1350                                 throw new ArgumentNullException ("address");
1351                         if (fileName == null)
1352                                 throw new ArgumentNullException ("fileName");
1353
1354                         lock (this) {
1355                                 SetBusy ();
1356                                 async = true;
1357
1358                                 async_thread = new Thread (delegate (object state) {
1359                                         object [] args = (object []) state;
1360                                         byte [] data;
1361
1362                                         try {
1363                                                 data = UploadFileCore ((Uri) args [0], (string) args [1], (string) args [2], args [3]);
1364                                                 OnUploadFileCompleted (
1365                                                         new UploadFileCompletedEventArgs (data, null, false, args [3]));
1366                                         } catch (ThreadInterruptedException){
1367                                                 OnUploadFileCompleted (
1368                                                         new UploadFileCompletedEventArgs (null, null, true, args [3]));
1369                                         } catch (Exception e){
1370                                                 OnUploadFileCompleted (
1371                                                         new UploadFileCompletedEventArgs (null, e, false, args [3]));
1372                                         }});
1373                                 object [] cb_args = new object [] {address, method, fileName,  userToken};
1374                                 async_thread.Start (cb_args);
1375                         }
1376                 }
1377
1378                 //    UploadStringAsync
1379
1380                 public void UploadStringAsync (Uri address, string data)
1381                 {
1382                         UploadStringAsync (address, null, data);
1383                 }
1384
1385                 public void UploadStringAsync (Uri address, string method, string data)
1386                 {
1387                         UploadStringAsync (address, method, data, null);
1388                 }
1389
1390                 public void UploadStringAsync (Uri address, string method, string data, object userToken)
1391                 {
1392                         if (address == null)
1393                                 throw new ArgumentNullException ("address");
1394                         if (data == null)
1395                                 throw new ArgumentNullException ("data");
1396
1397                         lock (this) {
1398                                 SetBusy ();
1399                                 async = true;
1400
1401                                 async_thread = new Thread (delegate (object state) {
1402                                         object [] args = (object []) state;
1403
1404                                         try {
1405                                                 string data2 = UploadString ((Uri) args [0], (string) args [1], (string) args [2]);
1406                                                 OnUploadStringCompleted (
1407                                                         new UploadStringCompletedEventArgs (data2, null, false, args [3]));
1408                                         } catch (ThreadInterruptedException){
1409                                                 OnUploadStringCompleted (
1410                                                         new UploadStringCompletedEventArgs (null, null, true, args [3]));
1411                                         } catch (Exception e){
1412                                                 OnUploadStringCompleted (
1413                                                         new UploadStringCompletedEventArgs (null, e, false, args [3]));
1414                                         }});
1415                                 object [] cb_args = new object [] {address, method, data, userToken};
1416                                 async_thread.Start (cb_args);
1417                         }
1418                 }
1419
1420                 //    UploadValuesAsync
1421
1422                 public void UploadValuesAsync (Uri address, NameValueCollection values)
1423                 {
1424                         UploadValuesAsync (address, null, values);
1425                 }
1426
1427                 public void UploadValuesAsync (Uri address, string method, NameValueCollection values)
1428                 {
1429                         UploadValuesAsync (address, method, values, null);
1430                 }
1431
1432                 public void UploadValuesAsync (Uri address, string method, NameValueCollection values, object userToken)
1433                 {
1434                         if (address == null)
1435                                 throw new ArgumentNullException ("address");
1436                         if (values == null)
1437                                 throw new ArgumentNullException ("values");
1438
1439                         lock (this) {
1440                                 CheckBusy ();
1441                                 async = true;
1442
1443                                 async_thread = new Thread (delegate (object state) {
1444                                         object [] args = (object []) state;
1445                                         try {
1446                                                 byte [] data = UploadValuesCore ((Uri) args [0], (string) args [1], (NameValueCollection) args [2], args [3]);
1447                                                 OnUploadValuesCompleted (
1448                                                         new UploadValuesCompletedEventArgs (data, null, false, args [3]));
1449                                         } catch (ThreadInterruptedException){
1450                                                 OnUploadValuesCompleted (
1451                                                         new UploadValuesCompletedEventArgs (null, null, true, args [3]));
1452                                         } catch (Exception e){
1453                                                 OnUploadValuesCompleted (
1454                                                         new UploadValuesCompletedEventArgs (null, e, false, args [3]));
1455                                         }});
1456                                 object [] cb_args = new object [] {address, method, values,  userToken};
1457                                 async_thread.Start (cb_args);
1458                         }
1459                 }
1460
1461                 protected virtual void OnDownloadDataCompleted (DownloadDataCompletedEventArgs args)
1462                 {
1463                         CompleteAsync ();
1464                         if (DownloadDataCompleted != null)
1465                                 DownloadDataCompleted (this, args);
1466                 }
1467
1468                 protected virtual void OnDownloadFileCompleted (AsyncCompletedEventArgs args)
1469                 {
1470                         CompleteAsync ();
1471                         if (DownloadFileCompleted != null)
1472                                 DownloadFileCompleted (this, args);
1473                 }
1474
1475                 protected virtual void OnDownloadProgressChanged (DownloadProgressChangedEventArgs e)
1476                 {
1477                         if (DownloadProgressChanged != null)
1478                                 DownloadProgressChanged (this, e);
1479                 }
1480
1481                 protected virtual void OnDownloadStringCompleted (DownloadStringCompletedEventArgs args)
1482                 {
1483                         CompleteAsync ();
1484                         if (DownloadStringCompleted != null)
1485                                 DownloadStringCompleted (this, args);
1486                 }
1487
1488                 protected virtual void OnOpenReadCompleted (OpenReadCompletedEventArgs args)
1489                 {
1490                         CompleteAsync ();
1491                         if (OpenReadCompleted != null)
1492                                 OpenReadCompleted (this, args);
1493                 }
1494
1495                 protected virtual void OnOpenWriteCompleted (OpenWriteCompletedEventArgs args)
1496                 {
1497                         CompleteAsync ();
1498                         if (OpenWriteCompleted != null)
1499                                 OpenWriteCompleted (this, args);
1500                 }
1501
1502                 protected virtual void OnUploadDataCompleted (UploadDataCompletedEventArgs args)
1503                 {
1504                         CompleteAsync ();
1505                         if (UploadDataCompleted != null)
1506                                 UploadDataCompleted (this, args);
1507                 }
1508
1509                 protected virtual void OnUploadFileCompleted (UploadFileCompletedEventArgs args)
1510                 {
1511                         CompleteAsync ();
1512                         if (UploadFileCompleted != null)
1513                                 UploadFileCompleted (this, args);
1514                 }
1515
1516                 protected virtual void OnUploadProgressChanged (UploadProgressChangedEventArgs e)
1517                 {
1518                         if (UploadProgressChanged != null)
1519                                 UploadProgressChanged (this, e);
1520                 }
1521
1522                 protected virtual void OnUploadStringCompleted (UploadStringCompletedEventArgs args)
1523                 {
1524                         CompleteAsync ();
1525                         if (UploadStringCompleted != null)
1526                                 UploadStringCompleted (this, args);
1527                 }
1528
1529                 protected virtual void OnUploadValuesCompleted (UploadValuesCompletedEventArgs args)
1530                 {
1531                         CompleteAsync ();
1532                         if (UploadValuesCompleted != null)
1533                                 UploadValuesCompleted (this, args);
1534                 }
1535
1536                 [MonoNotSupported("")]
1537                 protected virtual WebRequest GetWebRequest (Uri address)
1538                 {
1539                         throw new NotImplementedException ();
1540                 }
1541
1542                 protected virtual WebResponse GetWebResponse (WebRequest request)
1543                 {
1544                         return request.GetResponse ();
1545                 }
1546
1547                 protected virtual WebResponse GetWebResponse (WebRequest request, IAsyncResult result)
1548                 {
1549                         return request.EndGetResponse (result);
1550                 }
1551 #endif
1552         }
1553 }