Setting ipu user to null does not work

[nikolamilekic]

Describe the bug

The readme suggests setting ipu user to null for reverse proxy servers. This results in an error.

if you have a reverseproxy, then you definitely want to make sure you have real-ip configured correctly, and it's probably a good idea to nullmap the reverseproxy's IP just in case; so if your reverseproxy is sending requests from 172.24.27.9 then that would be --ipu=172.24.27.9/32=

ERROR: unknown users in ipu: ['']

To Reproduce

Start copyparty with --ipu=172.24.27.9/32=.

Expected behavior

No auto login for the given IP, as described in the readme.

Server details

• docker image: copyparty/ac:latest: 1.20.1

[9001]

thanks, this regression was introduced in v1.19.21 by #959

• beta SFX and whl: https://copyparty.eu/beta/
• beta docker image: docker/ac:beta on dockerhub