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asp.net - 无法从传输连接读取数据：操作已取消

问题描述

我们有一个 .NET WorkerService，它在事件中心的后台挂起触发器中运行，以将数据推送到 API Web 服务，但我们遇到了这个问题：

有什么想法可能导致这种情况吗？

​​​​ExceptionSource: "System.Net.Http", ExceptionType: "System.Threading.Tasks.TaskCanceledException: The operation was canceled. 

System.IO.IOException: Unable to read data from the transport connection: Operation canceled.

System.Net.Sockets.SocketException (125): Operation canceled 

End of inner exception stack trace --- 
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken) 
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token) 
at System.Net.Security.SslStream.<FillBufferAsync>g__InternalFillBufferAsync|215_0[TReadAdapter](TReadAdapter adap, ValueTask`1 task, Int32 min, Int32 initial) 
at System.Net.Security.SslStream.ReadAsyncInternal[TReadAdapter](TReadAdapter adapter, Memory`1 buffer) 
at System.Net.Http.HttpConnection.FillAsync() 
at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean foldedHeadersAllowed) 
at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken) 

--- End of inner exception stack trace --- 
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.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts) 
at Client.MyClient.UpdateAsync(DataRequestUpdate DataRequest, CancellationToken cancellationToken) in /src/Client/Client.cs:line 1232 
at Client.Repository.Update(Request data) in /src/Client/Repository.cs:line 32 
at WorkerService.EventProcessor.Update(UpdateRequest request) in /src/WorkerService/EventProcessor.cs:line 390", Message: "The operation was canceled." }​

标签： asp.net.netazureasp.net-core

解决方案

默认的 .NET httpclient 超时为100 秒。如果您的客户端耗时超过 100 秒，则会导致上述错误。要解决这个问题，只需增加超时值。

HttpClient httpClient = new HttpClient(); 
httpClient.Timeout = TimeSpan.FromMinutes(10); //Eg. 10mins timeout

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