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asp.net 设置全局代理和添加cookie实现文件下载

            string webporxy = System.Configuration.ConfigurationManager.AppSettings["WebPoxy"].ToString();// 获取代理：127.0.0.1:800
            if (webporxy != string.Empty)
                System.Net.WebRequest.DefaultWebProxy = new WebProxy(webporxy);
            Cookie cok = new Cookie("pausername", "ServUcn");

            Cookie cok1 = new Cookie("pauserid", "6172260");
            Cookie cok2 = new Cookie("papasswordhash", "507277cf24a404d4911efdf12a59ae5e");

            HttpWebRequest  req  =  (HttpWebRequest)WebRequest.Create("http://www.ucasp.net");
            req.CookieContainer = new CookieContainer();
            req.CookieContainer.Add(new Uri("http://www.ucasp.net"), cok);
            req.CookieContainer.Add(new Uri("http://www.ucasp.net"), cok1);
            req.CookieContainer.Add(new Uri("http://www.ucasp.net"), cok2);
            HttpWebResponse  res  =  (HttpWebResponse)req.GetResponse();

            System.IO.Stream  resData  =  res.GetResponseStream()  ;
            System.IO.StreamReader reader = new System.IO.StreamReader(resData, System.Text.Encoding.GetEncoding("gb2312"));
            string content = reader.ReadToEnd();  
            Response.Write(content)