Configuring https is an exercise left to your System Administrator as no code or configuration changes are required in the Open-AudIT application itself.
If you are usign a self-signed certificate, edit the file -
Linux - /usr/local/omk/conf/opCommon.json
In the omkd section find (or add if it's not there) omk_ua_insecure and set it to 1.
Restart the daemon for it to take effect -
Windows - restart the task in the task scheduler.
Linux - sudo systemctl restart omkd