code: @Internal
      public static Optional<NettyMutableHttpResponse> get(NettyHttpRequest<?> request) {
          NettyMutableHttpResponse nettyHttpResponse = request.attr(KEY).get();
          return Optional.ofNullable(nettyHttpResponse);
      }
docs: Lookup the response from the request.
  
  @param request The request
  @return The {@link NettyMutableHttpResponse}