Websockets, custom domain, express

There are two other posts here about this problem; I’m wondering if this third post points to a solution. Posting in the hope that someone more skilled in this topic has insight.

The two posts about this problem:

The code sample Glitch :・゚✧ shows the same problem, so I think it’s not a coding error.

This post refers to proxying websockets… suggestions on how to do that?

I can’t tell if this stack overflow q/a has useful information:

thanks!

(also related: Secure Websocket Server in Glitch Project?)