> After that, you use the REST API to make changes to the server while it is running, which uses a JSON configuration definition instead of a Caddyfile, so it ends up being a jump for users.
You can, in fact, use any configuration format with the API as long as Caddy has its adapter compiled-in; you just have to use the correct value in the `Content-Type` header. For instance, you can use Caddyfile format using the `text/caddyfile` value in `Content-Type`. This is documented[0].
[0] https://caddyserver.com/docs/api#post-load
