Azure应用服务 - 自定义身份验证 - 不允许HTTP动词

Question

我按照本教程在我的Xamarin.Forms应用程序中启用身份验证： https://adrianhall.github.io/develop-mobile-apps-with-csharp-and-azure/chapter2/custom/

使用Postman进行的测试（如教程中所述）成功完成。令牌返回。

当我从我的C＃代码中调用它时

LoginAsync("custom", Newtonsoft.Json.Linq.JObject.FromObject(auth));

我收到了如下错误：

Method not allowed. HTTP Verb not allowed

我发现Azure SDK在调用LoginAsync时发送POST和GET请求。所以我改变了这个......

[HttpPost, Route(".auth/login/custom")]
        public IHttpActionResult Post([FromBody]CPM.Arda.Mobile.Freelancer.Backend.DataObjects.Recruitment.Custom.PromoterAuthRequest promoterAuth)

到此......

[HttpPost, HttpGet, Route(".auth/login/custom")]
        public IHttpActionResult Post([FromBody]CPM.Arda.Mobile.Freelancer.Backend.DataObjects.Recruitment.Custom.PromoterAuthRequest promoterAuth)

HTTP Verb错误消失但发生以下错误：

 Operation=ReflectedHttpActionDescriptor.ExecuteAsync, Exception=System.NullReferenceException: Object reference not set to an instance of an object.
   at CPM.Arda.Mobile.Freelancer.Backend.Controllers.Custom.CustomAuthController.Post(PromoterAuthRequest promoterAuth)
   at lambda_method(Closure , Object , Object[] )
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Tracing.ITraceWriterExtensions.<TraceBeginEndAsyncCore>d__18`1.MoveNext()
2017-07-11T10:39:50  PID[9680] Error       Operation=ApiControllerActionInvoker.InvokeActionAsync, Exception=System.NullReferenceException: Object reference not set to an instance of an object.
   at CPM.Arda.Mobile.Freelancer.Backend.Controllers.Custom.CustomAuthController.Post(PromoterAuthRequest promoterAuth)
   at lambda_method(Closure , Object , Object[] )
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)

我真的很困惑。没有关于该主题的可用教程似乎开箱即用。

Answer 1

  

我发现Azure SDK 在调用LoginAsync时发送了POST和GET请求。

AFAIK，移动应用后端会强制使用https，如果您使用http发送请求，那么您将获得302状态代码，如下所示：

正如此issue所述，从http重定向 - ＆gt; https导致http动词获取。

在初始化MobileServiceClient时，使用Https更改移动应用Uri，您的代码将按预期工作。