// Enable TCP quick ACK, John Nagle says
			// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
			_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)

			/// Enable keep-alive
			{
				_ = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_KEEPALIVE, 1)

				// The time (in seconds) the connection needs to remain idle before
				// TCP starts sending keepalive probes

// Thin wrapper around a FunctionDef.
class GraphFunction : public AbstractFunction {
 public:
  explicit GraphFunction(FunctionDef fdef);
  ~GraphFunction() override;

  // GraphFunction maybe stay alive for the duration of the returned
  // FunctionDef.
  absl::Status GetFunctionDef(const FunctionDef** fdef) override;

  // Returns a shared reference to the wrapped function.

  // tasks to initialize the eager context and TF server for multi-client
  // execution.
  virtual absl::Status EnableCollectiveOps(const ServerDef& server_def) = 0;

  // Check if the remote task is alive.
  virtual absl::Status CheckRemoteAlive(const std::string& remote_task_name,
                                        bool* is_alive) = 0;

  // Get pointer to the coordination service agent instance.

                            "host": "testserver",
                            "accept": "*/*",
                            "accept-encoding": "gzip, deflate",
                            "connection": "keep-alive",
                            "user-agent": "testclient",
                        },
                    }
                )
                | IsDict(
                    # TODO: remove when deprecating Pydantic v1

			return BucketRemoteTargetNotVersioned{Bucket: tgt.TargetBucket}
		}
	}

	// Check if target is a MinIO server and alive
	hcCtx, cancel := context.WithTimeout(ctx, 3*time.Second)
	scheme := "http"
	if tgt.Secure {
		scheme = "https"
	}
	result := <-sys.hcClient.Alive(hcCtx, madmin.AliveOpts{}, madmin.ServerProperties{
		Endpoint: tgt.Endpoint,
		Scheme:   scheme,
	})

	cancel()

			}

		case <-time.After(ztunnelKeepAliveCheckInterval):
			// do a short read, just to see if the connection to ztunnel is
			// still alive. As ztunnel shouldn't send anything unless we send
			// something first, we expect to get an os.ErrDeadlineExceeded error
			// here if the connection is still alive.
			// note that unlike tcp connections, reading is a good enough test here.
			_, err := conn.readMessage(time.Second / 100)
			switch {

	wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// If server is in shutdown.
		if atomic.LoadUint32(&srv.inShutdown) != 0 {
			// To indicate disable keep-alive, server is shutting down.
			w.Header().Set("Connection", "close")

			// Add 1 minute retry header, incase-client wants to honor it
			w.Header().Set(RetryAfter, "60")

		}
	}()
	// handlerErr is guarded by 'send' channel.
	handlerErr = handler.Handle(ctx, msg.Payload, handlerIn, send)
	return handlerErr
}

// checkRemoteAlive will check if the remote is alive.
func (m *muxServer) checkRemoteAlive() {
	t := time.NewTicker(m.clientPingInterval)
	defer t.Stop()
	for {
		select {
		case <-m.ctx.Done():
			return
		case <-t.C:

                                  properties:
                                    interval:
                                      description: The time duration between keep-alive
                                        probes.
                                      type: string
                                      x-kubernetes-validations:

			Description: "set the quality of service priority, defaults to '0'",
			Optional:    true,
			Type:        "number",
		},
		config.HelpKV{
			Key:         target.MqttKeepAliveInterval,
			Description: "keep-alive interval for MQTT connections in s,m,h,d",
			Optional:    true,
			Type:        "duration",
		},
		config.HelpKV{
			Key:         target.MqttReconnectInterval,