Improve discosrv documentation for debugging

I'm having a hard time debugging a Discovery Server install.

It's behind a Caddy proxy so I've implemented the required directives from the documentation and it seems to be working but there's not mush I can do to test the API.

I've pointed 3 clients at the base url (https://example.com/), but they are unable to discover each other.
If I curl the base address of my Caddy server, or directly to the backend (https://example.com:8443/) it just returns "Not Found" without any http response header.
The logs show nothing, even when calling the baseURL, but since there's no API docs I don't know what else to try.

I am running stdiscosrv-linux-arm64-v1.29.5 with the flags --http, --debug, and I also added the flag --db-dir=/data since the startup message showed Error reading database: open records.db: no such file or directory but this error still remains. Am I supposed to init a DB or something?

Start with the linked stdiscosrv documentation and reproduce the reported requests against the base URL and backend using the stated --http, --debug, and --db-dir flags. Determine which API or health-check endpoints and database initialization behavior should be documented. Done means the documentation gives a newcomer concrete debugging requests and explains the records.db error.