A typical use case is to forward a single port to the proxy, then set the proxy to map different subdomains to different machines/ports on your internal network. Anything not explicitly mapped by the reverse proxy isn’t visible externally.

If you didn’t map a local config file into the container, it’s using the default version inside the container at /app/public/conf.yml (and any changes will get overwritten when you rebuild the container). If you want to make changes to the configuration for the widget, you’ll want to use the -v option with a local config file so the changes you make will persist.