How to get the original client IP logged?

[fabricat]

We reach Netbox-Docker behind a reverse proxy (HAProxy).

docker log always shows the IP of the proxy, rather than the real one (despite HAProxy adds both x-forwarded-for and x-real-ip headers).

I don't know well Nginx Unit, but I found that its Access Log does (only?) write using the Combined Log Format.

Is there a way to have the real IP of the user logged by Netbox-Docker?