"Bad Request" when sending request to Socket.IO app via Apache

What I have

I have Socket.IO app letteraly from template

const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const { Server } = require("socket.io");
const io = new Server(server);

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

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

And I configured Apache

<VirtualHost *:443>
  ServerName ws.domain.com
 
  ProxyPreserveHost On
  ProxyPass / http://127.0.0.1:3000/
  ProxyPassReverse / http://127.0.0.1:3000/

  SSLEngine on
  SSLCertificateFile /root/origin.pem
  SSLCertificateKeyFile /root/private.key
</VirtualHost>

When I try to send request via Postman to localhost:3000 everything works

But when I try to send request to ws.domain.com I always get 400 Bad Request

What I tried

1. I tried to configure Apache from docs this does not helped me
2. I tried to use Nginx and I configured it from docs its also does not helped me
3. I tried to rewrite server on Flask with PySocketIO and also with flask-socketio, and get same error

I am already completely desperate and do not understand what the problem is.

P.S. If this can be important, I use CentOS 7. I proxy the domain through the Cloudflare and there the websockets are of course connected

P.S.S. All my other HTTP applications on the server work correctly (via Apache), the problem is only in websockets