brandingDataUrl not working

Hi there,

I’m trying to use the dynamic branding feature via config option brandingDataUrl (PR). However, that URL is never called, not by the server nor the client; and thus branding does not work.

I couldn’t find any documentation about this feature and what requirements need to be fulfilled. I just set the option in config.js, but this is obviously not enough.

My server is a Debian buster with the current packages from

Any help, howto, documentation is appreciated.