重定向太多-使用Facebook Asp.Net进行外部登录

我正在创建一个web api，在这里我需要让人们使用Facebook登录

我跟在后面

一旦我向Facebook提供了我的凭据，它应该重定向到某个操作，但它会说：“重定向太多了。”

这是我在Startup.cs中得到的：

这是我的FacebookAuthProvider:类：

我非常好奇的一件事是，如果我取消注释这行：

[Route("ExternalLogin", Name = "ExternalLogin")]

并尝试使用该新路由访问该控制器，它表示

User

（GetExternalLogin的if中的一个）为

null

这是我用来测试的链接：

http://localhost:62887/api/ExternalAuth/GetExternalLogin?provider=Facebook&redirect_uri=http://localhost:62887/api/ExternalAuth/LoggedIn

用户成功登录后，应重定向以下操作：

[HttpGet]
        public IHttpActionResult LoggedIn()
        {
            return Ok(new { Message = "You've been successfully logged in! :)" });
        }

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我要自杀了，我终于成功了。我刚刚不得不将NuGet软件包从2.1更新到3.1…>：/

我要自杀了，我终于成功了。我刚刚不得不将NuGet软件包从2.1更新到3.1…>：/

嘿，你还活着吗是的，怎么了？嘿，你还活着吗是的，怎么了？

public class ChallengeResult : IHttpActionResult
    {
        public string LoginProvider { get; set; }
        public HttpRequestMessage Request { get; set; }

        public ChallengeResult(string loginProvider, ApiController controller)
        {
            LoginProvider = loginProvider;
            Request = controller.Request;
        }
        public Task<HttpResponseMessage> ExecuteAsync(CancellationToken cancellationToken)
        {
            Request.GetOwinContext().Authentication.Challenge(LoginProvider);

            HttpResponseMessage response = new HttpResponseMessage(System.Net.HttpStatusCode.Unauthorized);
            response.RequestMessage = Request;
            return Task.FromResult<HttpResponseMessage>(response);
        }
    }

[HttpGet]
        [OverrideAuthentication]
        [HostAuthentication(DefaultAuthenticationTypes.ExternalCookie)]
        [AllowAnonymous]
        //[Route("ExternalLogin", Name = "ExternalLogin")]
        public IHttpActionResult GetExternalLogin(string provider)
        {
            string redirectUri = string.Empty;
            AppUserManager manager = new AppUserManager(new AppUserStore(new AppContext()));

            if (!User.Identity.IsAuthenticated)
            {
                return new ChallengeResult(provider, this);
            }

            ExternalLoginData externalLogin = ExternalLoginData.FromIdentity(User.Identity as ClaimsIdentity);

            UserLoginInfo loginInfo = new UserLoginInfo(externalLogin.LoginProvider, externalLogin.ProviderKey);

            IdentityUser user = manager.Find(loginInfo);

            bool hasRegistered = user != null;

            ValidateRedirectUri(this.Request, ref redirectUri);

            redirectUri = String.Format("{0}#external_access_token={1}&provider={2}&haslocalaccount={3}&external_user_name={4}",
                                            redirectUri,
                                            externalLogin.AccessToken,
                                            externalLogin.LoginProvider,
                                            hasRegistered.ToString(),
                                            externalLogin.UserName);

            return Redirect(redirectUri);
        }

[Route("ExternalLogin", Name = "ExternalLogin")]

[HttpGet]
        public IHttpActionResult LoggedIn()
        {
            return Ok(new { Message = "You've been successfully logged in! :)" });
        }