无法从传输连接读取数据：操作取消

Question

我们有一个.NET WorkerService在后台运行，等待事件中心的触发器将数据推送到API Web服务，但我们遇到了这个问题：

有任何想法是什么导致了这个问题吗？

​​​​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." }​

- chad

---

你好，你在使用 HttpClient 时是否设置了超时时间？另外，请查看一下这个 github issue。 - DarkSideMoon

@DarkSideMoon 这真的很有帮助。我会研究一下，看看是否是同样的问题。谢谢！ - chad

没问题 :) 如果可以的话，你能否投票支持我的另一个回答呢？非常感谢！ - DarkSideMoon

有人得出结论了吗？Github问题似乎已经解决，但没有明确说明为什么会发生这种情况，尽管在Linux环境中可以清楚地重现。 - marcofo88

@MauriceKlimek 感谢确认。我已经写下了答案。 - chad

Answer 1

.NET的默认httpclient超时时间为100秒。 如果您的客户端所需时间超过100秒，将会导致以上错误。 要解决此问题，请简单地增加超时时间的值。

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

- chad