Json Application always return Empty array

string url = "http://192.168.1.104/test.php";
            string data = "{\"service\":\"absence.list\", \"company_id\":3}";

            HttpWebRequest myReq =(HttpWebRequest )WebRequest.Create(url);
            myReq.Method = "POST";
            myReq.ContentLength = data.Length;
            myReq.ContentType = "application/json; charset=UTF-8";
            string usernamePassword = "YOUR API TOKEN HERE" + ":" + "x";

            UTF8Encoding enc = new UTF8Encoding();
            myReq.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(enc.GetBytes(usernamePassword)));

            using (Stream ds = myReq.GetRequestStream())
            {
                ds.Write(enc.GetBytes(data), 0, data.Length);
            }

            WebResponse wr = myReq.GetResponse();
            Stream receiveStream = wr.GetResponseStream();
            StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);
            string content = reader.ReadToEnd();
            Response.Write(content);