@Override
 protected void doSessionIdle(HttpAcceptSession session, IdleStatus status) throws Exception {
   if (status == IdleStatus.WRITER_IDLE) {
     session.write(WsCommandMessage.NOOP);
   }
   super.doSessionIdle(session, status);
 }
 @Override
 protected void doSessionOpened(IoSessionEx session) throws Exception {
   assertTrue(checkSubject(session));
   super.doSessionCreated(session);
 }