Hi Dániel,
I doubt there’s a way to use Streamlit without websockets.
Are you allowed to use Jupyter notebooks over your company’s network? If so, then there should be a way to allow websocket connections with Streamlit since Jupyter also relies on websockets.
Most of the time I’ve seen this break on proxies that don’t have Connection upgrade set up so that a HTTP/1.1 can upgrade to a WebSocket connection. Modern proxies will allow this and it’s a matter of configuration.
Best,
John