When client sends some data to server I have error:
(index):40 Uncaught DOMException: Failed to execute 'send' on 'WebSocket': Still in CONNECTING state. at HTMLButtonElement.<anonymous> (https://testwebsocket-production.up.railway.app/:40:12)

and some time later I have error:
(index):21 WebSocket connection to 'wss://testwebsocket-production.up.railway.app:9090/' failed:

(anonymous)

Meanwhile logs are ok.

work of my game:

client connects to server -> server sends code of client to client -> client try make a connection by

let ws = new WebSocket("wss://testwebsocket-production.up.railway.app:9090");

and there I think is problem.