This page is served by Caddy. You are seeing it because no other site on this server matches the hostname in your request, or because the server has not been customised yet.
Caddy will keep showing this page until you tell it to serve something else. The customisation is a single edit to the Caddyfile and a reload.
index.html into the document root configured for the matching site.site_address { root * /var/www/yoursite } block to /etc/caddy/Caddyfile.sudo systemctl reload caddy.Caddy obtains a certificate automatically the first time a request reaches a domain configured in the Caddyfile, provided DNS resolves to this host. Renewals happen on a schedule without any operator action.
Full documentation is at the project site. The community forum is a friendly place to ask questions when the docs do not cover a specific scenario.
srv-eu-rotation-3