frame indicates
        that the remote peer wishes to close the WebSocket connection. The connection
        is considered gracefully closed when each side has sent and received a close
        frame.
      </p>
<p>
        During read operations, Beast automatically reads and processes control frames.
        If a control callback is registered, the callback is notified of the incoming
        control frame. The implementation will respond to pings automatically. The
        receipt of a close frame initi