Handle closing of HTTP client and server

runtime/bin/socket.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.
 
 interface ServerSocket default _ServerSocket {
   /**
    * Constructs a new server socket, binds it to a given address and port,
    * and listens on it.
    */
   ServerSocket(String bindAddress, int port, int backlog);
@@ skipping 14 matching lines @@
    */
   int get port();
 
   /**
    * Closes the socket.
    */
   void close();
 }
 
 
-interface Socket default _Socket {
+interface Socket extends Hashable default _Socket {
   /**
    * Constructs a new socket and connects it to the given host on the given
    * port.
    */
   Socket(String host, int port);
 
   /**
    * Returns the number of received and non-read bytes in the socket that
    * can be read.
    */
@@ skipping 60 matching lines @@
   int get port();
 
   /**
    * Closes the socket. Calling [close] will never throw an exception
    * and calling it several times is supported. If [halfClose] is true
    * the socket will only be closed for writing and it might still be
    * possible to read data. Calling [close] will not trigger a call to
    * [onClosed].
    */
   void close([bool halfClose]);
+
+  /**
+   * Socket is hashable.
+   */
+  int hashCode();
 }
 
 
 class SocketIOException implements Exception {
   const SocketIOException([String this.message = ""]);
   String toString() => "SocketIOException: $message";
   final String message;
 }