Yeah, I’m not sure then. I’ve never tried running Euro-Office like that. I run Caddy as a reverse proxy on the same server that the document server and Nextcloud is running on.
That said, even if you’re running a standalone document server, you could still install Apache, Nginx, Caddy, Traefik, or another reverse proxy on the same server as the document server and expose it through that.
One approach would be to start the document server container with something like:
-p 127.0.0.1:8080:80
This binds the container only to localhost on port 8080. You can then install your prefered web server, and let that handle HTTPS termination and reverse-proxy requests to http://127.0.0.1:8080. Alternatively, you could do the entire setup in Docker using Docker networking.
See also the discussion here:
That said, since this thread is specifically about a custom ONLYOFFICE image, I’d suggest opening a new thread if you have any further questions about Euro-Office or want to discuss it in more detail.