Never send reserved status codes in a close frame

runtime/bin/websocket.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.
 
 /**
  * Web socket status codes used when closing a web socket connection.
  */
 interface WebSocketStatus {
   static const int NORMAL_CLOSURE = 1000;
   static const int GOING_AWAY = 1001;
@@ skipping 52 matching lines @@
    * received. The type on [message] is either [:String:] or
    * [:List<int>:] depending on whether it is a text or binary
    * message. If the message is empty [message] will be [:null:].
    */
   void set onMessage(void callback(message));
 
   /**
    * Sets the callback to be called when the web socket connection is
    * closed. [status] indicate the reason for closing. For network
    * errors the value of [status] will be
-   * WebSocketStatus.ABNORMAL_CLOSURE].
+   * WebSocketStatus.ABNORMAL_CLOSURE]. In this callbach it is
+   * possible to call [close] if [close] has not already been called.
+   * If [close] has still not been called after the close callback
+   * returns the received close status will automatically be echoed
+   * back to the other end to finish the close handshake.
    */
   void set onClosed(void callback(int status, String reason));
 
   /**
    * Sends a message. The [message] must be a [:String:] a
    * [:List<int>:] or [:null:].
    */
   send(Object message);
 
   /**
@@ skipping 205 matching lines @@
    */
   void send(data);
 }
 
 
 class WebSocketException implements Exception {
   const WebSocketException([String this.message = ""]);
   String toString() => "WebSocketException: $message";
   final String message;
 }