I see! So I am assuming you had to configure Nginx specifically to support this? Problem is I love using Nginx Proxy Manager and I am not sure how to change that to use socket activation. Thanks for the info though!
Man, I often wonder whether I should ditch docker-compose. Problem is there's just so many compose files out there and its super convenient to use those instead of converting them into systemd unit files every time.
I am guessing you're not running Caddy itself in a container? Otherwise you'll run into the same real IP issue.