Caddy works!
If you can see this page, the Caddy web server is installed and running on this machine.
This is the default page. To serve your own site, edit the configuration file at /etc/caddy/Caddyfile and reload the service:
sudo systemctl reload caddy
Static files are served from /usr/share/caddy by default. Replace index.html there or point the root directive to another folder.
Documentation is available at caddyserver.com/docs.
Caddy web server