UCenter gitlab Single-Sign-On（sso）

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https://www.oschina.net/question/1770418_2191349、

https://leo108.com/pid-2138/

https://ruby-china.org/topics/10500?page=2

https://ruby-china.org/topics/32569

https://blog.csdn.net/iteye_8867/article/details/81642063

http://www.thinkphp.cn/code/85.html

https://forum.orfeo-toolbox.org/t/sso-on-discourse-with-gitlab-account/57/8

https://github.com/discourse/discourse