To resolve this, I changed the Proxy module I was using. It uses less code to implement and works with websockets. I think the NodeBB Node.js proxy documentation is out of date so I'll be submitting a PR with the new method I found.
Working code is as follows:
/** * Proxy forum */ const proxy = require('http-proxy-middleware'); // Forum Proxy app.use( '/forum', proxy({ target: 'http://www.myforum.co.uk/forum', changeOrigin: true, ws: true, }) );Another potential GOTCHA here is that this Prixy setup needs to be declared ABOVE the 'body-parser' module (if it's being used). The wrong order will prevent post requests from being proxied.
