How to implement Ping/Pong request for webSocket connection alive in javascript?

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I use websocket in javascript. But the connection close after one minute.

I am wondering somethings:

1- Is not Websocket naturaly providing with Ping/Pong messages not to close the connection? I think it have to. Otherwise what is the difference between websocket and TCP connection?

2- If I have to send the ping/pong messages, how is the ping message sent? What am I need to do? Is WebSocket object provide a ping method? Or should I call a method as websocket.send("ping") ? I am use naturaly WebSocket object in javascipt.

3- Should the server respond to Ping requests with Pong? Should this be implemented separately on the server side?

Note:Sorry for my english.


At this point in time, heartbeats are normally implemented on the server side: there's not much you can do from the client end.

However, if the server keeps killing your socket connection, and you have no control over it, it is possible for the client to send arbitrary data to the websocket on an interval:

let socket = null;

function connect_socket() {
  socket = new WebSocket(ws_url);
  socket.on("close", connect_socket); // <- rise from your grave!
  heartbeat();
}

function heartbeat() {
  if (!socket) return;
  if (socket.readyState !== 1) return;
  socket.send("heartbeat");
  setTimeout(heartbeat, 500);
}

connect_socket();

I strongly recommend trying to sort out what's happening on the server end, rather than trying to work around it on the client.

How to use ping/pong control frames to maintain websocket , Description I am using latest ws module to make a websocket client and server. One of One of my requirements is the module i choose to implement websocket with should support ping/pong frames to version: Node.js version(s):; OS version(s): This issue tracker is only for bugs and feature requests. I am using latest ws module to make a websocket client and server. One of my requirements is the module i choose to implement websocket with should support ping/pong frames to maintain connection? Does ws module do that natively, like will it send ping/pong frames internally to maintain connection or do I have to explicitly send ping pong frames?


Yes, there are ping/pong frames in websockets. Here is an example using the ws module, where the server is initiating the ping request:

const http = require('http');
const ws = require('ws');

const server = http.createServer(function(req_stream_in, res_stream_out) {
  // handle regular HTTP requests here
});
const webSocketServer = new ws.Server({
  path: "/websocket",
  server: server
});

const connected_clients = new Map();

webSocketServer.on('connection', function connection(ws_client_stream) {
  // NOTE: only for demonstration, will cause collisions.  Use a UUID or some other identifier that's actually unique.
  const this_stream_id = Array.from(connected_clients.values()).length;

  // Keep track of the stream, so that we can send all of them messages.
  connected_clients.set(this_stream_id, ws_client_stream);

  // Attach event handler to mark this client as alive when pinged.
  ws_client_stream.is_alive = true;
  ws_client_stream.on('pong', () => { ws_client_stream.is_alive = true; });

  // When the stream is closed, clean up the stream reference.
  ws_client_stream.on('close', function() {
    connected_clients.delete(this_stream_id);
  });
});

setInterval(function ping() {
  Array.from(connected_clients.values()).forEach(function each(client_stream) {
    if (!client_stream.is_alive) { client_stream.terminate(); return; }
    client_stream.is_alive = false;
    client_stream.ping();
  });
}, 1000);

How do we enable ping/pong? · Issue #977 · websockets/ws · GitHub, Can someone please explain how the ping/pong works with this module? Using this one can implement a heartbeat system to check if the connection is still alive. that error is beacuse you are using the pure JS WebSocket not the ws library Successfully merging a pull request may close this issue. The Ping and Pong messages are the handshake message in JSON format ({ "Type": "Ping" } and { "Type": "Pong" }) between the ADS WebSocket server and client for monitoring a connection health. The ADS server periodically sends Ping message to applications and applications must be prepared to send Pong messages as a response to any Ping message


In ouni's solution, heartbeat() wasn't kicking in. It works when it's put in an open event like this:

let socket = null;

function connect_socket() {
  socket = new WebSocket(ws_url);
  socket.on("close", connect_socket); // <- rise from your grave!
  socket.on("open", heartbeat); // heartbeat when the socket is open
}

function heartbeat() {
  if (!socket) return;
  if (socket.readyState !== 1) return;
  socket.send("heartbeat");
  setTimeout(heartbeat, 500);
}

connect_socket();

Sending and receiving heartbeat messages, Application Programming Interface · Testing Websockets for Redis · Debugging The Websocket protocol implements so called PING/PONG messages to keep Websockets alive, even behind proxies, firewalls and load-balancers. In order to have the client recognize this, some Javascript code has to be added to the  ping/pong works as specified in the RFC. An endpoint can send a ping frame via ws.ping() at any time after the connection is established. Upon receipt of a ping frame, an endpoint sends a pong frame in response which triggers the pong event. Using this one can implement a heartbeat system to check if the connection is still alive.


Mozilla documents a dedicated convention for ping/pong.

At any point after the handshake, either the client or the server can choose to send a ping to the other party. When the ping is received, the recipient must send back a pong as soon as possible. You can use this to make sure that the client is still connected, for example.

A ping or pong is just a regular frame, but it's a control frame. Pings have an opcode of 0x9, and pongs have an opcode of 0xA. When you get a ping, send back a pong with the exact same Payload Data as the ping (for pings and pongs, the max payload length is 125). You might also get a pong without ever sending a ping; ignore this if it happens.

If you have gotten more than one ping before you get the chance to send a pong, you only send one pong.

See: https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_servers#Pings_and_Pongs_The_Heartbeat_of_WebSockets

Find more in depth discussion about ping/pong from the browser side here: Sending websocket ping/pong frame from browser

More specifically, read the Websocket RFC 6455 about ping/pong.

An Introduction to WebSockets, . If the client does not reply, the server closes the connection. Earlier I had implemented the ping/pong like feedback mechanism at application layer to ensure if the remote endpoint is still responsive. I just recently updated my tornado package and I came across the ping_interval in WebSocketClientConnection. I removed the old ping/pong mechanism at application layer and added this ping_interval in my


WebSocket, connections on the same port. Once the connection is established, communication switches to a bidirectional binary protocol which does not conform to the HTTP protocol. At this point, I should probably mention what a pong message is. Essentially, it is a mechanism for checking that the connection is still alive. In this application, we're not going to deal with binary message types. But later on, you'll get a chance to implement a ping pong message endpoint as a challenge.


Writing WebSocket servers, A WebSocket server is an application listening on any port of a TCP server that sockets, such as C(++), Python, PHP, or server-side JavaScript. First of all, the server must listen for incoming socket connections using a standard TCP socket. A ping or pong is just a regular frame, but it's a control frame. Hi ! @nkzawa @humingchun @3rd-Eden As discussed in the #459 issue. I implement a Keep Alive protocol using websocket ping/pong. When the websocket don't reply to a ping with a pong, the serveur close the dead connection .


WebSocket ping pong - Feature Requests, Does the node-red websocket implementation include ping and ping to If there was a heartbeat/keepalive, the connection could be Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js. A WebSocket server is an application listening on any port of a TCP server that follows a specific protocol, simple as that. The task of creating a custom server tends to scare people; however, it can be easy to implement a simple WebSocket server on your platform of choice.