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这是 IdentityServer3 的不错教程，包括 GOOGLE+ 登录

https://identityserver.github.io/Documentation/docs/overview/mvcGettingStarted.html

var google = new GoogleOAuth2AuthenticationOptions
            {
                AuthenticationType = "Google",
                Caption = "Google",
                SignInAsAuthenticationType = signInAsType,

                ClientId = "xxxxx-8boio83mb57ruogr9af9ut09fkg56b27.apps.googleusercontent.com",
                ClientSecret = "5fWcBT0udKY7_b6E3gEiJlze"
            };
            app.UseGoogleAuthentication(google);

var fb = new FacebookAuthenticationOptions
            {
                AuthenticationType = "Facebook",
                Caption = "Facebook",
                SignInAsAuthenticationType = signInAsType,

                AppId = "xxxxxxx",
                AppSecret = "9d6ab75f921942e61fb43a9b1fc25c63"
            };
            app.UseFacebookAuthentication(fb);

问题是当我点击 GOOGLE+ 时，我得到了访问令牌，但这个令牌对 google api 无效。我无法取回对 Google+ API 有效的令牌，以便我可以取回所有 UserData。

FB也有同样的问题

这可能吗？

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