Technically, it should be possible to pass a file descriptor to a docker process, but I haven't seen that before. I don't like all parts of systemd but I think

Technically, it should be possible to pass a file descriptor to a docker process, but I haven't seen that before. I don't like all parts of systemd but I think the socket activation is pretty elegant. The decoupling also allows to bind on port 80 and 443 (because systemd runs as root), and then still have Caddy run as a user process. I think it would unlock nice things for Caddy.