zrok/etc/caddy/multiple_upstream.Caddyfile

http:// {
	bind {{ .ZrokBindAddress }}
	handle_path /zrok/* {
	    reverse_proxy https://zrok.io {
	        header_up Host zrok.io
	    }
	}
	reverse_proxy /* 127.0.0.1:3000 {
		header_up Host localhost:3000
	}
}