Initial web socket server implementation

runtime/bin/http.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * HTTP status codes.
  */
 interface HttpStatus {
   static final int CONTINUE = 100;
   static final int SWITCHING_PROTOCOLS = 101;
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   /**
    * Returns the output stream for the response. This is used to write
    * the response data. When all response data has been written close
    * the stream to indicate the end of the response.
    *
    * When this is accessed for the first time the response header is
    * send. Calling any methods that will change the header after
    * having retrieved the output stream will throw an exception.
    */
   OutputStream get outputStream();
+
+  /**
+   * Detach the underlying socket from the HTTP server. When the
+   * socket is detached the HTTP server will no longer perform any
+   * operations on it.
+   *
+   * This is normally used when a HTTP upgraded request is received
+   * and the communication should continue with a different protocol.
+   */
+  Socket detachSocket();
 }
 
 
 /**
  * HTTP client factory.
  */
 interface HttpClient default _HttpClient {
   static final int DEFAULT_HTTP_PORT = 80;
 
   HttpClient();
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    */
   InputStream get inputStream();
 }
 
 
 class HttpException implements Exception {
   const HttpException([String this.message = ""]);
   String toString() => "HttpException: $message";
   final String message;
 }