我正在编写一个使用HTTP代理一些ASP.NET请求的应用程序,我正在努力找出一个间歇性错误的来源。这看起来像是一种竞争状况。但我不能完全确定。
在我详细介绍之前,这里是应用程序的一般通信流程:
代理应用程序是使用.NET 4.5用ASP.NET Web API RTM编写的。执行中继的代码如下所示:
//Controller entry point.
public HttpResponseMessage Post()
{
using (var client = new HttpClient())
{
var request = BuildRelayHttpRequest(this.Request);
//HttpCompletionOption.ResponseHeadersRead - so that I can start streaming the response as soon
//As it begins to filter in.
var relayResult = client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).Result;
var returnMessage = BuildResponse(relayResult);
return returnMessage;
}
}
private static HttpRequestMessage BuildRelayHttpRequest(HttpRequestMessage incomingRequest)
{
var requestUri = BuildRequestUri();
var relayRequest = new HttpRequestMessage(incomingRequest.Method, requestUri);
if (incomingRequest.Method != HttpMethod.Get && incomingRequest.Content != null)
{
relayRequest.Content = incomingRequest.Content;
}
//Copies all safe HTTP headers (mainly content) to the relay request
CopyHeaders(relayRequest, incomingRequest);
return relayRequest;
}
private static HttpRequestMessage BuildResponse(HttpResponseMessage responseMessage)
{
var returnMessage = Request.CreateResponse(responseMessage.StatusCode);
returnMessage.ReasonPhrase = responseMessage.ReasonPhrase;
returnMessage.Content = CopyContentStream(responseMessage);
//Copies all safe HTTP headers (mainly content) to the response
CopyHeaders(returnMessage, responseMessage);
}
private static PushStreamContent CopyContentStream(HttpResponseMessage sourceContent)
{
var content = new PushStreamContent(async (stream, context, transport) =>
await sourceContent.Content.ReadAsStreamAsync()
.ContinueWith(t1 => t1.Result.CopyToAsync(stream)
.ContinueWith(t2 => stream.Dispose())));
return content;
}
间歇性出现的错误是:
异步模块或处理程序在异步操作仍处于挂起状态时完成。
此错误通常发生在对代理应用程序的前几个请求中,之后就不会再出现此错误。
Visual Studio在引发异常时从不捕获异常。但该错误可以在Global.asax Application_Error事件中捕获。不幸的是,异常没有堆栈跟踪。
代理应用程序托管在Azure Web角色中。
如果能帮助我们找出罪魁祸首,我们将不胜感激。
https://stackoverflow.com/questions/15060214
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