https://identityserver.github.io/Documentation/docsv2/

https://github.com/IdentityServer/IdentityServer3.Samples.git

https://github.com/IdentityServer/IdentityServer3

http://www.cnblogs.com/Irving/category/635732.html

http://www.cnblogs.com/xishuai/p/aspnet-webapi-owin-oauth2.html

http://docs.identityserver.io/en/release/quickstarts/1_client_credentials.html   IdentityServer4

https://www.scottbrady91.com/Identity-Server/Identity-Server-3-Standalone-Implementation-Part-1    IdentityServer3