Maximum concurrent Socket.IO connections

Question

This question has been asked previously but not recently and not with a clear answer.

Using Socket.io, is there a maximum number of concurrent connections that one c

Answer 1

I tried to use socket.io on AWS, I can at most keep around 600 connections stable.

And I found out it is because socket.io used long polling first and upgraded to websocket later.

after I set the config to use websocket only, I can keep around 9000 connections.

Set this config at client side:

const socket = require('socket.io-client')
const conn = socket(host, { upgrade: false, transports: ['websocket'] })