Why is React not connecting via socket.io?

Question

Node.js

There is a react code like this:

import io from 'socket.io-client';
const socket = io('http://localhost:3000');
socket.on('connect', (d) => {
  socket.emit('new_connection', document.location.href.split('?')[1].replace(document.location.hash, ''))
})

node code:

var app = express() 
var http = require('http').createServer(app)
var io = require('socket.io')(http)

io.on('connection', (socket) => {
  socket.on('new_connection',  () => {
    console.log('ok')
  })
});



http.listen(3000, () => {
  console.log('listening on *:3000')
})

The bottom line is that everything works on the local (on my PC), it is worth uploading to the server, it does not connect there. I set up the path on Nginx, instead of 'http://localhost:3000'just trying to write, both the url and the ip of the machine do not want to connect. What could be the problem?

Answer 1

1) Check the path on the ws connection, maybe you left localhost somewhere =)
2) Check if the server is turned on on the server (for example, create a test get-request and throw it with Ajax)
I think the problem is in the addresses. If there is an error on ws, then please throw it in the comments!)

Answer 2

Check CORS