public static void GetHead(string url)       {            var http = (HttpWebRequest)WebRequest.Create(url);            http.Method = "HEAD";//设置Method为HEAD            http.UserAgent = "Tujia-Auto-Test";            try            {                HttpWebResponse response = (HttpWebResponse)http.GetResponse();                Console.Write(Convert.ToInt32(response.StatusCode) + " " + response.StatusCode.ToString());//Statuscode 为枚举类型，200为正常，其他输出异常，需要转为int型才会输出状态码                response.Close();            }            catch (WebException ex)            {                Console.WriteLine(Convert.ToInt32(((HttpWebResponse)ex.Response).StatusCode)+"  "+((HttpWebResponse)ex.Response).StatusCode.ToString());            }        }