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我想將ServiceStack.net配置爲使用OAuthProvider對Google進行身份驗證。這是我目前的配置：如何配置ServiceStack.net以使用OAuthProvider對Google進行身份驗證
Plugins.Add(new AuthFeature(() => new AuthUserSession(),
new IAuthProvider[] {
new OAuthProvider(appSettings,
"https://accounts.google.com/o/oauth2/auth",
"google",
"Google Client ID",
"Google Client secret")
}));
不過，我得到以下錯誤：
response Status
error Code ArgumentNullException
message String reference not set to an instance of a String. Parameter name: s
stack Trace
[Auth: 8/19/2013 7:48:47 PM]: [REQUEST: {provider:google}] System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: s at System.Text.Encoding.GetBytes(String s) at ServiceStack.ServiceInterface.Auth.OAuthUtils.PercentEncode(String s) at ServiceStack.ServiceInterface.Auth.OAuthAuthorizer.<>c__DisplayClass3.<MakeSignature>b__1(String k) at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() at System.Linq.Buffer`1..ctor(IEnumerable`1 source) at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) at ServiceStack.ServiceInterface.Auth.OAuthAuthorizer.MakeSignature(String method, String base_uri, Dictionary`2 headers) at ServiceStack.ServiceInterface.Auth.OAuthAuthorizer.AcquireRequestToken() at ServiceStack.ServiceInterface.Auth.OAuthProvider.Authenticate(IServiceBase authService, IAuthSession session, Auth request) at ServiceStack.ServiceInterface.Auth.AuthService.Authenticate(Auth request, String provider, IAuthSession session, IAuthProvider oAuthConfig) at ServiceStack.ServiceInterface.Auth.AuthService.Post(Auth request) at lambda_method(Closure , Object , Object) at ServiceStack.ServiceHost.ServiceRunner`1.Execute(IRequestContext requestContext, Object instance, TRequest request)
據網絡跟蹤，從來都沒有命中谷歌。
謝謝！