[rcme]

I think nginx does that too; if you send it a hup signal, it will reload the config.

[housemusicfan]

Indeed, many programs interpret a kill -HUP signal as a "re-read config" command.

[mholt]

This is problematic as when you log out your shell, HUP is sent to the web server process unintentionally...

(One reason we don't use signals in Caddy 2. So uncivilized.)