code: @Override
      public void filterWrite(final NextFilter nextFilter,
              final IoSession session, final WriteRequest writeRequest) {
          writeData(nextFilter, session, writeRequest, false);
      }
docs: Filters outgoing writes, queueing them up if necessary while a handshake
  is ongoing.
  
  @param nextFilter the next filter in filter chain
  @param session the session object
  @param writeRequest the data to write