请问一个HTTP的PUT方法程序的异常，谢谢！
请问大家，写了个方法，在main里调用了该函数。异常已经标出，不知道有几种原因？会不会uri错了？拜谢！

C# code

 public static string ModifiyFixedCost(CookieContainer cookieContainer)        {            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://10.63.11.34/vCenter-CB/api/hierarchy/696/entity/697/costModel/701/fixedCosts/values");            request.CookieContainer = cookieContainer;            request.Method = "PUT";            request.KeepAlive = true;            request.Timeout = 600000;            request.ContentType = "application/x-www-form-urlencoded";//application/x-www-form-urlencoded            Stream streamReq = request.GetRequestStream();            ///Read XML file.            String strXML;            string strCurrentPath = System.IO.Directory.GetCurrentDirectory();            string strPath;            strPath = strCurrentPath + "\\ModifiyFixedCostXML.txt";            using (StreamReader sr = new StreamReader(strPath))            {                strXML = sr.ReadToEnd();            }            string strResp;            byte[] byteArray = Encoding.UTF8.GetBytes(strXML);            streamReq.Write(byteArray, 0, byteArray.Length);            streamReq.Close();            using (WebResponse response = request.GetResponse())            //报异常：WebException was unhandled: The remote server returned an error:(500)Internal Server Error.            //Trace:   at System.Net.HttpWebRequest.GetResponse()                       at ChargeBack.ChargeBack.ModifiyFixedCost(CookieContainer cookieContainer) in C:\Users\Administrator\documents\visual studio 2010\Projects\ChargeBack\ChargeBack\ChargeBack.cs:line 340                       at ChargeBack.ChargeBack.Main(String[] args) in C:\Users\Administrator\documents\visual studio 2010\Projects\ChargeBack\ChargeBack\ChargeBack.cs:line 86                       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)                       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)                       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()                       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)                       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)                       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)                       at System.Threading.ThreadHelper.ThreadStart()            {                Stream streamResp = response.GetResponseStream();                StreamReader streamReaderResp = new StreamReader(streamResp);                strResp = streamReaderResp.ReadToEnd();            }            return strResp;        }

[解决办法]
你服务器支持PUT方法么
[解决办法]
WebException was unhandled: The remote server returned an error:(500)Internal Server Error.

500的错误应该是对方服务器处理时出错了，直接网页访问可以吗？
.Net4需要显示关闭代理Proxy