In my setup the ttrss-server is behind an apache reverse-proxy.
So I have the message about wrong SELF_URL_PATH, too.
Sanity check (and ttrss) actually fail with the correct url (proxied url) and only accepts the "local" server url.
I have no idea, how a server can check, if it is behind a reverse proxy.
So in my case I think the only solution is to deactivate the check.
Am I right or do you have an idea, how to solve this?