HttpWebRequest dosent获得响应

Question

当我尝试加载＆＃34; https://web.com/forum＆＃34;我没有得到回应，这个url dosent需要登录加载。使用浏览器我只需要复制网址，它没有以前的会话工作正常。

当我尝试加载其他网址时，例如＆＃34; https://web.com＆＃34;它有效，但＆＃34; https://web.com/forum＆＃34;有意义的工作。为什么呢？

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://web.com/forum");
            CookieContainer cookieJar = new CookieContainer();
            req.CookieContainer = cookieJar;
            req.Referer = "https://web.com/forum";
            req.Method = "GET";
            req.Host = "web.com";
            req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            req.ContentType = "application/x-www-form-urlencoded";
            req.UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0";
            req.Proxy = null;

            using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    using (StreamReader sr = new StreamReader(responseStream))
                    {
                        respuesta = sr.ReadToEnd();
                    }
                }
            }

            MessageBox.Show(respuesta);

这里的问题是什么？。

我还试图删除referer，contentype，useragent ......和其他标题但没有成功。

感谢。