Accept로 시작하는 헤더들은 Content negotiation에 사용되는 헤더HTTP Request HeadersHTTP Host HeaderHTTP User-Agent HeaderHTTP Cookie HeaderHTTP Referer HeaderHTTP Origin HeaderHTTP Authorization HeaderHTTP Upgrade-Insecure-Requests HeaderHTTP Accept HeaderHTTP Client Hints HeaderHTTP If-None-MatchHTTP If-Modified-SinceHTTP Accept-Language