public static void Subscribe(string subscriberName, string s)
        {
            var addr = new Uri(HOST_URI, SUBSCRIPTIONS + subscriberName);
            var req = CreateHttpRequest(addr, new TimeSpan(0, 0, 0, 30), WebRequestMethods.Http.Post);
            AddBody(req,s);
            var response = CallApi(req); 
        }
        public static void AddSubscriber(String subscriberName)
        {
            var addr = new Uri(HOST_URI, SUBSCRIBER+ subscriberName);
            var req = CreateHttpRequest(addr, new TimeSpan(0, 0, 0, 30), WebRequestMethods.Http.Put);
            var response = CallApi(req);
        }
