Caddy v2.1 CORS whitelist

Caddyfile

(cors) {
	@origin{args.0} header Origin {args.0}
	header @origin{args.0} Access-Control-Allow-Origin "{args.0}"
	header @origin{args.0} Vary Origin
}
myawesomewebsite.com {
	root * /srv/public/
	file_server
	header Access-Control-Allow-Methods "POST, GET, OPTIONS"
	@options {
		method OPTIONS
	}
	respond @options 204
	import cors https://member.myawesomewebsite.com
	import cors https://customer.myawesomewebsite.com
}