specify which version of web sockets

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.
 
 /**
  * The web socket protocol is implemented by a HTTP server handler
  * which can be instantiated like this:
  *
  *     WebSocketHandler wsHandler = new WebSocketHandler();
  *
  * and then its onRequest method can be assigned to the HTTP server, e.g.
  *
  *     server.defaultHandler = wsHandler.onRequest;
  *
  * or
  *
  *     server.addRequestHandler((req) => req.path == "/ws",
  *                              wsHandler.onRequest);
+ *
+ * This handler strives to implement web sockets as specified by RFC6455.
  */
 interface WebSocketHandler default _WebSocketHandler {
   WebSocketHandler();
 
   /**
    * Request handler to be registered with the HTTP server.
    */
   void onRequest(HttpRequest request, HttpResponse response);
 
   /**
@@ skipping 247 matching lines @@
    */
   void send(data);
 }
 
 
 class WebSocketException implements Exception {
   const WebSocketException([String this.message = ""]);
   String toString() => "WebSocketException: $message";
   final String message;
 }