无法从传输连接读取数据：操作已取消答案

【问题标题】：Unable to read data from the transport connection: Operation canceled无法从传输连接读取数据：操作已取消
【发布时间】：2021-05-18 10:29:05
【问题描述】：

我们有一个在后台运行的 .NET WorkerService，它从事件中心挂起触发器以将数据推送到 API Web 服务，但我们遇到了这个问题：

任何想法可能导致这种情况？

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." }

【问题讨论】：

嗨，你的HttpClient 使用超时吗？另外，请看github issue
@DarkSideMoon 这真的很有帮助。我会调查一下，看看是否是同一个问题。谢谢！
没问题 :) 另外，如果可以的话，请您再投票给我的答案，非常感谢！
有人得出结论吗？ Github 问题似乎得到了解决，但没有明确解释为什么会发生这种情况，尽管在 Linux 环境中显然可以重现。
@MauriceKlimek 感谢您的确认。我已经写下了答案。

标签： asp.net .net azure asp.net-core

【解决方案1】：

默认的 .NET httpclient 超时为100 secs。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，只需增加超时值即可。

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

【讨论】：