hey! i am using the nginx proxy manager template https://railway.com/new/template/vXq1Wp to add a reverse proxy infront of my nextjs app to restrict access to my endpoints.
we've been using the public railway url (up.railway.app) to access the webapp and was wondering if it's possible to use that url as the domain name in the proxy host or if i need to get a custom domain - i haven't been able to get it to work with the public (up.railway.app) url