httpwebrequest获取cookie不全的问题(有图有代码,目前无真相...)

网址:http://tuiguang.ganji.com/house_report/auth.php 我用httpwatch跟踪有7个cookie,而用httpwebrequest只能得到2个,不知道为啥,哪位帮个忙???  我只能得到 jsession 和 nsc_wt_uh_qpsu_80 ,连wt_fpc都得不到,很奇怪... 补充一下,我清了一下cookie,发现默认不是7个,是三个,但我的request还是只能得到两个,这个没有得到 __utmc Sent 32156897 / ganji.com (Session) 貌似跟域名有关系,但是我不知道怎么得到这个(ganji.com)域名下的cookie.
            HttpWebRequest request;
            HttpWebResponse response = null;            request = WebRequest.Create("http://tuiguang.ganji.com/house_report/auth.php") as HttpWebRequest;
            request.CookieContainer = cookie;
            request.Method = "GET";
            request.Timeout = 30000;
            request.AllowAutoRedirect = true;
            request.ContentType = "application/x-www-form-urlencoded";
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; Alexa Toolbar)";
            request.Accept = "*/*";
            request.Referer = url;
            //request.Headers.Add("Accept-Language", "zh-CN");
            //request.Headers.Add("Accept-Encoding", "gzip, deflate");
            request.KeepAlive = true;
            try
            {
                //获取服务器返回的资源  
                using (response = (HttpWebResponse)request.GetResponse())
                {
                    response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);
                    using (StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
                    {                       // request.Headers.Remove("Cookie");
                        string cookieHeader = request.CookieContainer.GetCookieHeader(request.Address);
                        if (cookieHeader.Length > 0)
                        {
                            request.Headers["Cookie"] = cookieHeader;
                        }                        if (response.Cookies.Count > 0)
                        {
                            cookie.Add(response.Cookies);
                        }
                    }
                }
            }
            catch
            {            }