How to organize communication between two different sites using laravel websocket?

Question

JavaScript

Good afternoon!
Do not tell me, I'm trying to connect via laravel websocket on the client (third-party site with a downloaded script from 88f02f9f.ngrok.io)

window.Echo = new Echo({
                            broadcaster: 'pusher',
                            key: process.env.MIX_PUSHER_APP_KEY,
                            cluster: process.env.MIX_PUSHER_APP_CLUSTER,                           
                            wsHost: '88f02f9f.ngrok.io',
                            wsPort: 6001,
                        });

mistake

index.min.js:1 WebSocket connection to 'wss://88f02f9f.ngrok.io/app/123?protocol=7&client=js&version=5.0.3&flash=false' failed: Error during WebSocket handshake: Unexpected response code: 404

that is, I have a bunch of client on the first server and Laravel websocket on the second (via ngrok)