self-hosted custom url

[super25k]

Hi,
I'm having trouble setting up the app to work w/ a custom url.
I have a local vm running the app. It is accessible and working just fine on vm-ip-address:3000.
I have HAProxy running to redirect local lan domain app.mydomain.net to vm-ip-address:3000.
I have tried modifications to .etc.local and supabase/config.toml but I cannot get things to work via HAProxy.
Has anyone had success with setting up a custom URL for their self-hosted chatbot-ui instance?
Rgs,
Mike