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HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.mafengwo.cn/mdd/book_down.php?type=pdfdown&mddid=15031");
request.Method="HEAD";
request.AllowAutoRedirect = false;
HttpWebResponse reponse= (HttpWebResponse)request.GetResponse();
string cc = reponse.GetResponseHeader("Location");
代码如上。