Owin SelfHost的WebAPI - 客户端的响应时关闭连接抛出一个例外？ [英] Owin SelfHost WebApi - client closing the connection during response raises an exception?

问题描述

我运行Owin Selfhost基础的WebAPI在那里我已经通过

放在一个API未处理的异常记录

  config.Services.Add（typeof运算（IExceptionLogger），_apiExceptionLogger）;
 

ApiExceptionLogger的相关部分：

 公共覆盖无效日志（ExceptionLoggerContext上下文）
    {
        如果（背景== NULL || context.ExceptionContext == NULL）回报;

        Logger.Error（从网络API未处理的异常，context.ExceptionContext.Exception）;
    }
 

的情况下，它捕捉和记录经常是那些在客户端请求数据集，然后，而结果（JSON）被送回关闭连接 - 人民作出的镀铬的请求，然后将所有结果之前击中X按钮回来：P

我粘贴下面的完整堆栈跟踪，只是想知道两件事情：

• 这是常规的/预期的行为？ AFAIK这是...我快pretty的默认API和流水线
• 有什么办法来处理呢？从本质上更优雅停止请求处理的情况下，取消（整个请求管道穿插的取消标记就浮现在脑海中，但并不像他们做很多在这种情况下，之后的所有令牌仅支持合作社注销）

我没有做过的事件发生在套接字级别的序列中的任何深潜，到目前为止，这仅仅是一个记录滋扰。

  System.Net.Http.Htt prequestException：错误，同时复制内容流。 ---＆GT; System.IO.IOException ---＆GT; System.Net.HttpListenerException：在I / O操作已中止，因为一个线程退出或应用程序请求
   在System.Net.Htt presponseStream.EndWrite（IAsyncResult的asyncResult）
   在Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.EndWrite（IAsyncResult的asyncResult）
   ---内部异常堆栈跟踪的结尾---
   在Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.EndWrite（IAsyncResult的asyncResult）
   在System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic（IAsyncResult的IAR，Func`2的endfunction，Action`1 endAction，Task`1承诺，布尔requiresSynchronization）
   ---内部异常堆栈跟踪的结尾---
   在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务的任务）
   在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务的任务）
   在System.Web.Http.Owin.HttpMessageHandlerAdapter＆LT; SendResponseContentAsync＆GT; d__20.MoveNext（）在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务的任务）
   在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务的任务）
   在System.Web.Http.Owin.HttpMessageHandlerAdapter＆LT; SendResponseContentAsync＆GT; d__20.MoveNext（）
 

解决方案

我对树莓派Owin主机类似的问题。这可能有助于<一个href="http://stackoverflow.com/a/30583109/1786034">http://stackoverflow.com/a/30583109/1786034

I'm running an Owin Selfhost based WebApi where i've put in an API unhandled exception logger via

config.Services.Add(typeof(IExceptionLogger), _apiExceptionLogger);

Relevant part of ApiExceptionLogger:

    public override void Log(ExceptionLoggerContext context)
    {
        if (context == null || context.ExceptionContext == null) return;

        Logger.Error("Unhandled exception from Web API", context.ExceptionContext.Exception);
    }

The cases it's catching and logging regularly are ones where the client requests a dataset and then closes the connection while the results (JSON) are being sent back - people making a request in chrome, and then hitting the X button before all results come back :P

I've pasted a stacktrace below for completeness, just want to know two things:

• Is this regular/expected behavior? AFAIK it is...I'm running a pretty default API and pipeline
• Is there any way to handle this? Essentially stop request processing more gracefully in case of a cancellation (the cancellation tokens peppered throughout the request pipeline do come to mind, but doesn't look like they do much in this case, after all the tokens only support co-operative cancellation)

I haven't done any deep dive on the sequence of events happening at the socket level, so far this is only a logging nuisance.

System.Net.Http.HttpRequestException: Error while copying content to a stream. ---> System.IO.IOException ---> System.Net.HttpListenerException: The I/O operation has been aborted because of either a thread exit or an application request
   at System.Net.HttpResponseStream.EndWrite(IAsyncResult asyncResult)
   at Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.EndWrite(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at Microsoft.Owin.Host.HttpListener.RequestProcessing.ExceptionFilterStream.EndWrite(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
   --- End of inner exception stack trace ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Owin.HttpMessageHandlerAdapter.<SendResponseContentAsync>d__20.MoveNext()    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Owin.HttpMessageHandlerAdapter.<SendResponseContentAsync>d__20.MoveNext()

解决方案

I had a similar issue with Owin host on Raspberry Pi. This may help http://stackoverflow.com/a/30583109/1786034

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