c# – 远程服务器返回错误：(500)内部服务器错误

public override object Request()
    {
        Response = "";
        RequestTime = DateTime.Now;
        var url = _service.Url;
        HttpWebResponse responSEObj = null;
        try
        {
            Uri requestUri = null;
            Uri.TryCreate(url,UriKind.Absolute,out requestUri);



            CredentialCache cc = new CredentialCache();
            NetworkCredential networkCredential = new NetworkCredential("username","password",url);
            Uri uri = new Uri(url);
            cc.Add(uri,"Basic",networkCredential);
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);

            request.Proxy = new WebProxy(url);
            request.Credentials = cc;

            request.Method = WebRequestMethods.Http.Post;


            Response = request.GetResponse();


        }
        catch (Exception x)
        {

            Logger.append(x.Message,Logger.ERROR);
        }
        Duration = DateTime.Now.Subtract(RequestTime).TotalMilliseconds;
        return Response;
   }

我直接从浏览器尝试了网址,它正在运行.