From the Caddy release announcement that supports wildcards[1]: "This release introduces support for wildcard certificates, a new offering from Let's Encrypt.

From the Caddy release announcement that supports wildcards[1]: "This release introduces support for wildcard certificates, a new offering from Let's Encrypt. Getting a wildcard certificate requires enabling the DNS challenge. Fortunately, that is extremely simple with Caddy, and it works with over 20 different providers!" 1: https://caddyserver.com/blog/caddy-0_10_12-released https://caddyserver.com/blog/caddy-0_10_12-released