I haven't found a way to set custom headers.
For my use case, I need to set
proxy_set_header Authorization $http_authorization;
proxy_pass_header Authorization;.
Is this currently possible via the interface? (I haven't found a way to do this.)
If not, I would be very grateful if it were possible to either set this header using a checkbox or to use custom headers.
See here too: https://forum.opnsense.org/index.php?topic=51125.0