node.js , socket.io - disconnect event delay when internet connection dies

Question

I notice that socket.on('disconnect') fires immediately when I close browser tab. But it fires approximately in a minute after internet connection dies. I'm using socket.io module. How can I fix this issue?

Answer 1

You have to use pingTimeout and pingInterval options on the server side to control this:

const io = require('socket.io').listen(server, {
  pingTimeout: 5000,
  pingInterval: 10000
});

• pingTimeout (Number): how many ms without a pong packet to consider the connection closed (5000)
• pingInterval (Number): how many ms before sending a new ping packet (25000)

More details about params: https://github.com/socketio/engine.io#methods-1