How to configure socket.io to run on same port on https?

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const express = require('express');
const https = require('https');
const socketio = require('socket.io');
const fs = require('fs');

const app = express();
const server = https.createServer({
  key: fs.readFileSync('path/to/private-key.pem'),
  cert: fs.readFileSync('path/to/certificate.pem')
}, app);
const io = socketio(server);

io.on('connection', (socket) => {
  console.log('A user connected');
  
  socket.on('disconnect', () => {
    console.log('A user disconnected');
  });
});

server.listen(443, () => {
  console.log('Socket.io server running on port 443');
});