code: public static Request<String> getWeatherRequest(String q) {
  
          Request<String> res = null;
  
          if (q == null) {
              q = "London,uk";
          }
  
          res = new StringRequest(Request.Method.GET, "http://api.openweathermap.org/data/2" +
                  ".5/weather?q=" + q);
  
          return res;
      }
docs: http://echo.jsontest.com/key/value/one/two