Seerr not loading (correctly) if Jellyfin served from path

[Zepmann]

Situation

• Jellyfin is served from a path, such as /example/.

• The reverse proxy is configured to forward all traffic with path /example/(...) to the Jellyfin server.

• Moonfin plugin is installed and configured to use Seerr.

• When Seerr is accessed through the web UI, requests are made to /example/Moonfin/Jellyseerr/web/seerr/(...).

Problem

The web server returns error 404 for these requests.

Expected result

The web server should return the relevant Moonfin/Seerr (proxied) content.

[Zepmann]

Did some more debugging and think I found the problem.

• Seerr runs on the same server as /seerr/. This is also the URL configured in Moonfin settings.
• Moonfin requests an incorrect URL: /example/Moonfin/Jellyseerr/web/seerr/(...)
• Moonfin should request the correct URL: /example/Moonfin/Jellyseerr/web/(...)

In other words, a path used by Seerr should not be used as part of the proxy URL as accepted by Moonfin.