code: @Handler(channels = NetworkChannel.class)
      public void onAccepted(Accepted event, IOSubchannel netChannel) {
          new WebAppMsgChannel(event, netChannel);
      }
docs: Creates a new downstream connection as {@link LinkedIOSubchannel}
  of the network connection, a {@link HttpRequestDecoder} and a
  {@link HttpResponseEncoder}.
  
  @param event
  the accepted event