ReverseProxy - NatLibFi/Skosmos GitHub Wiki
If you run Skosmos behind a reverse proxy server such as Varnish, you may have problems with broken links. Often the symptom is that the Skosmos pages are really plain HTML as the CSS files, images and JavaScript will not load.
Skosmos tries to guess the base URL, but in a reverse proxy setup it will usually be wrong. You will need to force the base URL with a setting like this in the global section of config.ttl:
skosmos:baseHref "http://my.public.host/skosmos/" ;
The URL value should be where the front page of the Skosmos installation is visible to the public through the reverse proxy.