Custom HTTP return code instead of 503

[Prime1Code]

Is there a docker config to return a custom http code instead / for a 503?

Lets say you have the domain "example.org" with a few subdomains, s1 and s2.

How would you return http 444 in case the user navigates to example.org instead of s1.example.org?

Is there a vhost config or sth similar for this problem? Tried a few options. Nothing worked.

Had to start a separate nginx container serving "nothing" at example.org and then add a vhost config in the nginx-proxy to return a 444.