ajax - Web API CORS 选项仅在 azure 上随机返回 500

Question

我正在开发一个 .NET Web Api(使用 OWIN)和一个使用 Web API 的 ember 应用程序。 Web api 托管在 azure(api 应用程序)上。问题是有时选项调用失败(500 错误)并且 GUI 挂起。如果我再次触发选项调用，它会再次工作。如果我在本地 IIS 上运行 api，则永远不会发生此问题。当我有一段时间(5 分钟)没有在 Web 应用程序中执行任何操作/触发任何 ajax 调用时，最常出现此问题。知道为什么会发生这种情况吗？

这是我的启动配置:

public partial class
    Startup
{
    public void Configuration(IAppBuilder app)
    {
        //enable cors
        app.UseCors(CorsOptions.AllowAll);


        //enable hangfire
        Hangfire.GlobalConfiguration.Configuration
            .UseSqlServerStorage("DbConnection")
            .UseActivator(new StructureMapJobActivator(IoC.Initialize()));

        app.UseHangfireDashboard();
        app.UseHangfireServer();

        //automapper
        AutoMapperBootstrapper.Bootstrap();

        //oauth 2
        var userManager = new UserManager();

        var authConfig = new SentinelAuthorizationServerOptions()
            {
                UserManager = userManager,
                ClientManager = new ClientManager(),
            };

        var shaProvider = new SHA2CryptoProvider();

        var onBoardTokenRepository = new OnBoardTokenRepository(new ConnectionFactory(new Configuration()), "DbConnection");
        authConfig.TokenManager = new TokenManager(LogManager.GetLogger<Startup>(), userManager, new PrincipalProvider(shaProvider), shaProvider, new TokenFactory(), onBoardTokenRepository);

        app.UseSentinelAuthorizationServer(authConfig);

        GlobalConfiguration.Configure(WebApiConfig.Register);
    }

我在 azure 事件日志中发现了此错误:

   https://microsoft-apiapp08044e6364624e2e88cfda954ace012a.azurewebsites.net:443/job/getemployerjobs/job/getemployerjobs104.45.82.120FalseIIS APPPOOL\Microsoft-ApiApp08044e6364624e2e88cfda954ace012a108IIS APPPOOL\Microsoft-ApiApp08044e6364624e2e88cfda954ace012aFalse   at System.Web.HttpHeaderCollection.SetHeader(String name, String value, Boolean replace)   at System.Web.HttpHeaderCollection.Set(String name, String value)   at Microsoft.Owin.Host.SystemWeb.CallHeaders.AspNetResponseHeaders.Set(String key, String[] values)   at Microsoft.Owin.Host.SystemWeb.CallHeaders.AspNetResponseHeaders.set_Item(String key, String[] value)   at Microsoft.Owin.Infrastructure.OwinHelpers.SetHeaderUnmodified(IDictionary`2 headers, String key, String[] values)   at Microsoft.Owin.Infrastructure.OwinHelpers.AppendHeaderUnmodified(IDictionary`2 headers, String key, String[] values)   at Microsoft.Owin.HeaderDictionary.AppendValues(String key, String[] values)   at Microsoft.Owin.Security.OAuth.OAuthBearerAuthenticationProvider.<.ctor>b__2(OAuthChallengeContext context)   at Microsoft.Owin.Security.OAuth.OAuthBearerAuthenticationProvider.ApplyChallenge(OAuthChallengeContext context)   at Microsoft.Owin.Security.OAuth.OAuthBearerAuthenticationHandler.ApplyResponseChallengeAsync()   at Microsoft.Owin.Security.Infrastructure.AuthenticationHandler.<ApplyResponseCoreAsync>d__b.MoveNext()--- 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 Microsoft.Owin.Security.Infrastructure.AuthenticationHandler.<ApplyResponseAsync>d__8.MoveNext()--- 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 Microsoft.Owin.Security.Infrastructure.AuthenticationHandler.<TeardownAsync>d__5.MoveNext()--- 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 Microsoft.Owin.Security.Infrastructure.AuthenticationMiddleware`1.<Invoke>d__0.MoveNext()--- 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 Microsoft.Owin.Security.Infrastructure.AuthenticationMiddleware`1.<Invoke>d__0.MoveNext()--- 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 Microsoft.Owin.Mapping.MapMiddleware.<Invoke>d__0.MoveNext()--- 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 Microsoft.Owin.Cors.CorsMiddleware.<Invoke>d__0.MoveNext()--- 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 Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.<RunApp>d__5.MoveNext()--- 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 Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.<DoFinalWork>d__2.MoveNext()--- End of stack trace from previous location where exception was thrown ---   at Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar)   at Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar)   at System.Web.HttpApplication.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Answer 1

这似乎与 Microsoft 的 OWIN 实现有关:http://katanaproject.codeplex.com/discussions/540202 .

相关的拉取请求在这里:https://katanaproject.codeplex.com/workitem/263

底层 OWIN OAuth 中间件有时会在创建响应时“密封”响应。