Thank you for your response, Aleks!
Here is the situation:
I want to access my RSS-Bridge instance through authentication, since I do not want it to be publicly exposed. I’m trying to use RSS-Bridge’s built-in authentication method (a simple web authentication: https://rss-bridge.github.io/rss-bridge/For_Hosts/Custom_Configuration.html#authentication).
If I can get this working, I can easily connect through most RSS readers that support this by default (e.g., FreshRSS).
However, it does not work properly via YunoHost. I get stuck in a loop with the authentication prompt and am never actually logged in.
Previously, I used the YunoHost Groups/Permissions interface, as you suggested and as described in this post: https://forum.yunohost.org/t/http-basic-authentication-for-an-app-directory/30202
Unfortunately, this no longer works. The issue is that RSS readers are no longer able to access my RSS-Bridge instance using the login created via the YunoHost Groups/Permissions interface. They show an error like: status code is 200, meaning “A feed could not be found.” It used to work, but it doesn’t anymore.
I would really appreciate any suggestions or recommendations.