And is also not picked up by directadmin
To list all options known to directadmin with their configured (or default if not configured) values:
/usr/local/directadmin/directadmin c
To search for a specific option:
/usr/local/directadmin/directadmin c | grep redirect_host_https
Please note that redirect_host_https is in custombuild/options.conf, it is not in directadmin.conf - I only wonder if redirect_host_https in options.conf is there by a mistake and maybe not used?