用HttpWebRequest抓取网页，"尝试自动重定向的次数太多”的错误，

原因：服务器上需要cookie才能浏览

解决：

CookieContainer cookieCon = new CookieContainer();
 req.CookieContainer = cookieCon;

 

req.Referer = http://www.google.com; //设置HTTP_REFERER