

I use a .dev and it just works with letsencrypt. I don’t do anything special with wildcards, I just let traefik request a cert for every subdomain I use and it works. I use the tls challenge which works on port 443, so I don’t think HSTS or port 80 matters, but I still forwarded port 80 it so I can serve an http->https redirect since stuff like curl and probably other tools might not know about HSTS.
The first commenter is obviously a cat in disguise.