Hey @kenux I don’t think you’re going to have much luck here with the most straightforward configuration - Glitch’s proxy will only forward requests on web-like ports to the project container, so requests trying to communicate with your glitch.me address on a non-web port won’t be forwarded to your project at all (that is to say, trying to communicate over myproject.glitch.me:3000 won’t work as it might if the application was running in its own VM).
You might be able to use something like what @etamponi was talking about in What's the port range users have at Glitch? to work around this issue.
Hope this helps!