Using Cloudflare Proxy

Hi, I'm a bit new to the SSL and proxy settings so sorry for asking stupid questions.

I have set up my cloudflare DNS records to point to the real IP with my server but when I enable the proxy the connection seems to fail. Is there some way to use cloudflare with a websocket server? I've been using cloudflare on my website for months but cant figure out how to hide my app behind it.