nginx error landing page -- possible to customize?

[Grossartig]

I have nginx configured to serve up one of my internal web applications on port 8443. I have also opened port 8443 in the WAN firewall rules. When I use the virtual server URL (i.e. https://www.example.com:8443), it all works as expected. When I instead use my external IP address (i.e. https://xxx.xxx.xxx.xxx:8443, I get to some sort of default OPNsense error page saying "Not Found. The resource you want to access is not available. Please contact the webmaster if you think this is an error." with a big OPNsense logo displayed below it.

Is it possible to not serve up an error response at all but to simply deny the request unless it's coming in through one of the proper named virtual hosts and not just the external IP address? I'd like to hide from any potential external attacker that I am even using OPNsense as a firewall.

Thanks!

[fabian]

This feature is already provided and might find its way into a future version :

https://github.com/opnsense/plugins/pull/2149

[Grossartig]

This is great -- thank you for pointing that out -- looking forward to this feature!

[fabian]

In theory the stream certificates should be exported to files:
https://github.com/opnsense/plugins/blob/master/www/nginx/src/opnsense/scripts/nginx/setup.php#L148