I tried something like this with Traefik just recently using add prefix and strip prefix rules. It had limited success until until I encountered an application that doesn’t have everything behind a sub path, Like /lovelace (home assistant)or something like that. If the application just basis it off the host with a root path, than you can’t really apply the prefix rule as the reverse proxy will not know how to route the request as the application is asking for a path that is not already a sub. You may come into this situation more often with several applications. I ended up just switching back to virtual hosts myself.