Restrict access to server

[hannesbochmann]

Is it somehow possible to restrict the access to the tileserver to certain websites so not anybody is able to use the tileserver on other websites? I searched a lot but couldn't find a hint that tessera/tilelive are capable of that. Of course I could install something like iptables and block traffic by referrer etc. but I hope there is a solution that can easily be configured.
There seems to be the possibility to configure domains in /project/config.json (docker run -d -v $(pwd):/data -e DOMAINS='www.example.com' -p 80:80 klokantech/tileserver-mapnik) but it seems like this has nothing to do with restricting access. What is it good for? Couldn't find anything in the tessera documentation.

P.S. I know, to realize such a simple access restriction the server has to rely on data from a client and this data can be spoofed/manipulated. But it would at least give some security.