title: jetty 9 add websockets handler to handler list
body: <p>All handlers in that example work apart from the websockets handler</p>
  
  <pre><code>       WebSocketHandler wsHandler = new WebSocketHandler() {
          @Override
          public void configure(WebSocketServletFactory factory) {
              factory.register(WebsocketsService.class);
          }
      };
  
      HandlerList handlers = new HandlerList();
      handlers.setHandlers(new Handler[] { resource_handler, servletContextHandler, wsHandler, new DefaultHandler() });
      server.setHandler(handlers);
  </code></pre>
  
  <p>it fails with</p>
  
  <p>WebSocket connection to 'ws://localhost:8080/' failed: Error during WebSocket handshake: Unexpected response code: 200</p>
  
  <p>how would be a websockets handler properly configured and added (maybe with a differen Path and Port as the servletContextHandler or could it be added there ?) ?</p>