Too many automatic redirections were attempted 的解决方法

 

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(address);
HttpWebRequest response = (HttpWebRequest)request.GetResponse();
Stream sm = response.GetResponseStream();

上面代码在访问一些网站时正常，但有一些却出错：

Too many automatic redirections were attempted

解决方法是加上一条语句，如下所示：

 

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(address);
request.CookieContainer = new CookieContainer();
HttpWebRequest response = (HttpWebRequest)request.GetResponse();
Stream sm = response.GetResponseStream();

 

分析过程：

用IE访问”出错“网站，一切正常。这说明出错的应该是我的程序。

如果在request初始化后加入下面语句

reqest.AllowAutoRedirect = false;

虽然request.GetResponse()正常返回，但是request.状态却是FOUND。

用WireShark抓包，分析IE与程序的数据包区别，发现在第2、3次跳转时IE多了Cookie。所以怀疑和它有关。

所以加上上面语句解决了问题。