dll中封装好的函数HttpWebRequest请求网页总是 connection：close
如题在dll中封装好的函数请求一个网址，抓包显示  connection：close

导致获取不到网页内容，异常退出
dll代码如下：

StreamReader sr = null;

            HttpWebResponse response = null;

            HttpWebRequest request = null;

            Stream instream = null;

            CkCollect = null;

            Encoding encoding = Encoding.UTF8; ;

            string content = "";

            Waiturl += ConvertDateTimeInt(DateTime.Now);

            try

            {

               

                Waiturl = Waiturl.Replace("TempTime", "1393299987118");

                request = WebRequest.Create(Waiturl) as HttpWebRequest;

                request.Timeout = 10000;

                request.Accept = "*/*";

                request.KeepAlive = true;

                request.UserAgent = "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.11 Safari/537.36";

                request.Referer = referurl;

                request.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");

                request.Headers.Add("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");

                request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.8");

                request.CookieContainer = ck;

                response = (HttpWebResponse)request.GetResponse();

                instream = response.GetResponseStream();

                if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))

                    sr = new StreamReader(new GZipStream(instream, CompressionMode.Decompress), encoding);

                else

                    sr = new StreamReader(response.GetResponseStream(), encoding);

                content = sr.ReadToEnd();

------解决方案--------------------
Waiturl  用ie访问看看