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我正在使用 HttpWebRequest 来获取一些类似 twitter-API 的 Json 资源，场景是使用 XAuth-Authentication 登录应用程序后，应用程序将使用 API（http://api.xxx.com/account/notification.json ) 以获取响应 Json。我的 HttpWebRequest 方法如下：

public void Request(string url)
        {
            var request = (HttpWebRequest)HttpWebRequest.Create(url);

            IAsyncResult result = null;
            result = (IAsyncResult)request.BeginGetResponse(ResponseCallback, request);
        }

        private void ResponseCallback(IAsyncResult result)
        {
            try
            {
                var request = (HttpWebRequest)result.AsyncState;
                var response = request.EndGetResponse(result);


                using (var stream = response.GetResponseStream())
                {
                    using (var reader = new StreamReader(stream))
                    {

                        if (CallBack != null)
                        {
                            var str = reader.ReadToEnd();
                            CallBack(CleanInvalidXmlChars(str));
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Deployment.Current.Dispatcher.BeginInvoke(delegate
                {
                    CallBack(ex.ToString());
                });
            }
        }

在最常见的情况下，一切都很顺利。直到一些用户告诉我他们总是遇到异常。然后我使用调试发现异常跟踪是：

"System.ArgumentException ---> System.ArgumentException: [net_WebHeaderInvalidControlChars]\r\nArguments:\r\nDebugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=4.7.60408.0&File=System.Net.dll&Key=net_WebHeaderInvalidControlChars \r\nParameter name: name\r\n   at System.Net.ValidationHelper.CheckBadWebHeaderChars(String name, Boolean isHeaderValue)\r\n   at System.Net.WebHeaderCollection.set_Item(String name, String value)\r\n   at System.Net.Browser.HttpWebRequestHelper.AddHeaderToCollection(WebHeaderCollection headerCollection, String headerName, String headerValue)\r\n   at System.Net.Browser.HttpWebRequestHelper.ParseHeaders(Uri requestUri, SecurityCriticalDataForMultipleGetAndSet`1 headers, WebHeaderCollection collection, Boolean removeHttpOnlyCookies, HttpStatusCode& status, String& statusDescription)\r\n   at System.Net.Browser.ClientHttpWebRequest.Progress(Object sender, EventArgs e)\r\n   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)\r\n   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)\r\n\r\n   at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)\r\n   at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)\r\n   at FanfouSDK.Utiltiy.HttpGetMethod.ResponseCallback(IAsyncResult result)\r\n   at System.Net.Browser.ClientHttpWebRequest.<>c__DisplayClassa.<InvokeGetResponseCallback>b__8(Object state2)\r\n   at System.Threading.ThreadPool.WorkItem.WaitCallback_Context(Object state)\r\n   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n   at System.Threading.ThreadPool.WorkItem.doWork(Object o)\r\n   at System.Threading.Timer.ring()\r\n"

这似乎是这里的一些问题（System.Net.Browser.ClientHttpWebRequest.EndGetResponse throw System.ArgumentException when header contains non-ascii content）

然后我使用 Fiddler 跟踪 webresponse，发现服务器返回了预期的 Json 字符串，但仍然导致异常。

预期的 Json 字符串： 在此处输入图像描述 Everythis 是可以的，但仍然会导致 net_WebHeaderInvalidControlChars 异常，是不是因为 X-Authuser？

我一直在努力寻找解决方案，但只是失败了。任何建议将不胜感激。谢谢。

PS：有点奇怪，在我的真机上运行我的app时，并没有出现异常，但是在模拟器和对方的真机上都会出现异常。

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1 回答 1

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I suspect this is because of Chinese characters present in the header (X-AuthUser). This problem was also described here with Cyrillic characters, so it is highly likely to be the same scernario.

于 2012-04-12T03:28:58.520 回答