code: public final WebsocketSender websocket(String subprotocols, int maxFramePayloadLength) {
  		Objects.requireNonNull(subprotocols, "subprotocols");
  		TcpClient tcpConfiguration = tcpConfiguration()
  				.bootstrap(b -> HttpClientConfiguration.websocketSubprotocols(b, subprotocols))
  				.bootstrap(b -> HttpClientConfiguration.websocketMaxFramePayloadLength(b, maxFramePayloadLength));
  		return new WebsocketFinalizer(tcpConfiguration);
  	}
docs: HTTP Websocket to connect the {@link HttpClient}.
  
  @param subprotocols a websocket subprotocol comma separated list
  @param maxFramePayloadLength maximum allowable frame payload length
  
  @return a {@link WebsocketSender} ready to consume for response