What rewrite rules? Caddy does it for you automatically. With nginx it's a single line in the config file. Or throw your site into HSTS preload (ok, you'll have

What rewrite rules? Caddy does it for you automatically. With nginx it's a single line in the config file. Or throw your site into HSTS preload (ok, you'll have to add a single header to the config) and any modern browser won't even try HTTP. There are multiple solutions and all of them are even simpler than what he picked.