GET /oauth/authorize?client_id=${REST_API_KEY}&redirect_uri=${REDIRECT_URI}&response_type=code HTTP/1.1
Host: kauth.kakao.com
[카카오 로그인] https://developers.kakao.com/docs/latest/ko/kakaologin/rest-api#kakaologin
https://developers.kakao.com/docs/latest/ko/kakaologin/design-guide