c# - Cant get a website output

I'm trying to get a output from http://ift.tt/2cmtpnZ i will get all items with regex but my request is empty. I'm trying to get outpput with fetchrequest method

Fetch Request:

    private string FetchRequest(string inpUrl, string inpMethod, string inpReferer, string inpHost, string inpAccept, NameValueCollection inpNvc, bool xml, bool autoRedirect)
    {
        using (var response = Request(inpUrl, inpMethod, inpReferer, inpHost, inpAccept, inpNvc, xml, autoRedirect))
        {
            _cookies.Add(response.Cookies);
            using (var responseStream = response.GetResponseStream())
            {
                if (responseStream == null) return null;
                using (var reader = new StreamReader(responseStream))
                {
                    return reader.ReadToEnd();
                }
            }
        }
    }

Request method

    private HttpWebResponse Request(string inpUrl, string inpMethod, string inpReferer, string inpHost, string inpAccept, NameValueCollection inpNvc, bool inpXml, bool autoRedirect)
    {
        var request = (HttpWebRequest)WebRequest.Create(inpUrl);
        request.Accept = inpAccept;
        request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
        request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
        request.Timeout = 20000;
        request.Headers.Add("Accept-Language", "de,en-US;q=0.7,en;q=0.3");
        request.AllowAutoRedirect = autoRedirect;
        request.CookieContainer = _cookies;
        request.Method = inpMethod;
        //Volatile variables

        if (inpHost != "")
        {
            request.Host = inpHost;
        }

        if (inpReferer != "")
        {
            request.Referer = inpReferer;
        }
        if (inpXml)
        {
            request.Headers.Add("X-Requested-With", "XMLHttpRequest");
            request.Headers.Add("X-Prototype-Version", "1.7");
            request.Headers.Add("Cache-Control", "no-cache");
            request.Headers.Add("Pragma", "no-cache");
        }

        if (inpMethod != "POST") return request.GetResponse() as HttpWebResponse;
        var dataString = (inpNvc == null ? null : string.Join("&", Array.ConvertAll(inpNvc.AllKeys, key =>
            HttpUtility.UrlEncode(key) +"=" + HttpUtility.UrlEncode(inpNvc[key])
            )));
        if (dataString == null) return request.GetResponse() as HttpWebResponse;
        var dataBytes = Encoding.UTF8.GetBytes(dataString);
        request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
        request.ContentLength = dataBytes.Length;
        using (var requestStream = request.GetRequestStream())
        {
            requestStream.Write(dataBytes, 0, dataBytes.Length);
        }
        return request.GetResponse() as HttpWebResponse;
    }

My variables

    public List<Item> AllListedItems(TradeType SellOrder)
    {
        List<Item> orders = new List<Item>();
        var containsItems = true;
        var baseUrl = "http://ift.tt/2bMuYXd" + _stackUser + "&page=";
        var page = 1;
        const string accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
        const string host = "backpack.tf";
        while (containsItems)
        {
                var url = baseUrl + page;
                var responseBody = FetchRequest(url, "GET", "", host, accept, null, false, false);
                        .
                        .
                        .

Fetchrequest returns empty string.