title: Netty 4 : share handler in different pipeline
body: <p>The <code>ChannelInitializer.initChannel</code> method is called for every new connection,</p>
  
  <pre><code>pipeline.addLast(new HttpServerCodec());
  pipeline.addLast(new HttpObjectAggregator(65536));
  pipeline.addLast(new ServerWebSocketServerProtocolHandler("/api", "*", false));
  </code></pre>
  
  <p>Can I reuse the same instance for all connections? How to tell if specific handler is reusable cross multiple connections?</p>