Webserver and docker bound to IPv4 only

[rahra]

The webserver is only bound to 127.0.0.1:8000 but not [::1]:8000.
These leads to the reverse proxy always first failing to connect to ::1 before retrying to 127.0.0.1. This is a slight loss in connection speed. Although probably not notable for a single user it may sum up on a heavy loaded server with many users.

As a workaround the reverse proxy can be configured to proxy explicitly to 127.0.0.1 instead of localhost.