Thanks for your reply @borrrden. I guess I need to find out if using other ports than 443 and 80 is that big a problem - and if so either user som url-pattern to differentiate the requests to the SG from the app.server’s API - and just split them out in Nginx.
I suppose I can add some url “path” to the SG endpoint? Or perhaps differentiate on protocol…? It’s probably obvious that I don’t really know all the angles of this issue - I was just confronted with the problem of limitations on some ports on public networks and really would like to avoid that being an issue for users of the app…