OAuth 이해하기

http://devx.tistory.com/entry/OAuth-%EC%9D%B8%EC%A6%9D%EB%B0%A9%EC%8B%9D-%EC%9D%B4%ED%95%B4%ED%95%98%EA%B8%B0

https://aaronparecki.com/2012/07/29/2/oauth2-simplified#roles

https://developers.daum.net/services/apis/docs/oauth2_0/intro

https://developers.google.com/identity/protocols/OAuth2

http://d2.naver.com/helloworld/24942

https://tools.ietf.org/html/rfc6749

https://oauth.net/core/1.0/#anchor25