<commit_before># OAUTH

* [Why is there an “Authorization Code” flow in OAuth2 when “Implicit” flow works so well?](http://stackoverflow.com/questions/13387698/why-is-there-an-authorization-code-flow-in-oauth2-when-implicit-flow-works-s)
<commit_msg>Add 理解OAuth 2.0.<commit_after># OAUTH

* [Why is there an “Authorization Code” flow in OAuth2 when “Implicit” flow works so well?](http://stackoverflow.com/questions/13387698/why-is-there-an-authorization-code-flow-in-oauth2-when-implicit-flow-works-s)
* [理解OAuth 2.0](http://www.ruanyifeng.com/blog/2014/05/oauth_2_0.html)

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