Silverlight客户端和WCF服务之间的间歇性通信问题

发布于 2024-11-26 12:00:58 字数 2246 浏览 1 评论 0原文

我有一个 Silverlight 4 应用程序，它与运行 IIS 7.5 的服务器进行通信，该服务器托管着许多我自己的 WCF 服务。该应用程序在 99% 的时间内运行良好，但用户报告说该应用程序每天都会冻结几次，或者在应用程序的各个点上都会生成错误消息。

我打开 WCF 跟踪并发生以下错误：

<Exception>
  <ExceptionType>System.ServiceModel.ProtocolException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
  <Message>The number of bytes available is inconsistent with the HTTP Content-Length header.  There may have been a network error or the client may be sending invalid requests.        </Message>
  <StackTrace>
    at System.ServiceModel.Channels.HttpInput.ReadBufferedMessage(Stream inputStream)
    at System.ServiceModel.Channels.HttpInput.ParseIncomingMessage(Exception&amp; requestException)
    at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, Action callback)
    at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
    at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
    at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
    at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
    at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
    at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
    at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
  </StackTrace>
</Exception>

然后我在用户的计算机上运行 Fiddler 并发现发生以下错误：

HTTP/1.1 504 Fiddler - Receive Failure
Content-Type: text/html; charset=UTF-8
Connection: close
Timestamp: 18:24:21.941

ReadResponse() failed: The server did not return a response for this request.

从一些研究来看，客户端和服务器之间似乎存在一些通信问题。该服务器是一个虚拟专用服务器，我从未遇到过任何问题，并且从查看日志来看，它从未耗尽处理器/内存。

我的问题是： 1. 我可以做些什么来更详细地跟踪正在发生的事情，或者我可以调整任何与 IIS 或服务器相关的内容以避免此错误 2. 在我的 Silverlight 应用程序中，有什么方法可以等待特定的时间（例如 30 秒），如果没有收到响应，则取消当前请求并重试

原文

I have a Silverlight 4 application that communicates with a server running IIS 7.5 that hosts a number of my own WCF services. The application runs happily 99% of the time but users reports that a few times a day the application will freeze or error messages will be generated at various points in the application.

I turned on WCF tracing and the following errors occur:

<Exception>
  <ExceptionType>System.ServiceModel.ProtocolException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
  <Message>The number of bytes available is inconsistent with the HTTP Content-Length header.  There may have been a network error or the client may be sending invalid requests.        </Message>
  <StackTrace>
    at System.ServiceModel.Channels.HttpInput.ReadBufferedMessage(Stream inputStream)
    at System.ServiceModel.Channels.HttpInput.ParseIncomingMessage(Exception& requestException)
    at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, Action callback)
    at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
    at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
    at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
    at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
    at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
    at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
    at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
  </StackTrace>
</Exception>

I then ran Fiddler on a user's machine and found the following errors were occurring:

HTTP/1.1 504 Fiddler - Receive Failure
Content-Type: text/html; charset=UTF-8
Connection: close
Timestamp: 18:24:21.941

ReadResponse() failed: The server did not return a response for this request.

From some research it looks like there is some communication problem between the client and the server. The server is a Virtual Private server which I have never had any trouble with and from looking at the logs it is never maxed out processor/memory wise.

My questions are:
1. Is there anything I can do to track what is happening in more detail or anything IIS or server related I can adjust to avoid this error
2. In my Silverlight application is there some way I can wait a specific amount of time (e.g. 30 seconds) and if no response has been recieved cancel the current request and try again

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