The operation was canceled.   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection connection, HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at TzCloud.Services.Http.StandardHttpClient.GetStringAsync(String uri, Dictionary`2 headers) in D:\work\天助网平台\TzCloudV2\ApiService\TzCloud.ApiServices.Client\Http\StandardHttpClient.cs:line 43
   at TzCloud.Services.HttpRemoteBase.HttpGetAsync[TResult](String url) in D:\work\天助网平台\TzCloudV2\ApiService\TzCloud.ApiServices.Client\HttpRemoteBase.cs:line 33
   at TzCloud.Services.Shangjipindao.ShangjipindaoSiteService.<>c__DisplayClass4_0.<<GetIndustrySite>b__0>d.MoveNext() in D:\work\天助网平台\TzCloudV2\ApiService\TzCloud.ApiServices.Client\Shangjipindao\ShangjipindaoSiteService.cs:line 52
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.Extensions.Caching.Memory.CacheExtensions.GetOrCreateAsync[TItem](IMemoryCache cache, Object key, Func`2 factory)
   at TzCloud.Shangjipindao.IndustryWeb.Filters.VerificationSiteDomainFilter.AuthorizationImpl.OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next) in D:\work\天助网平台\TzCloudV2\TzCloud.Shangjipindao.IndustryWeb\Filters\VerificationSiteDomainFilter.cs:line 59