code: private String nullEscape(Object pArg) {
          if (pArg == null) {
              return "[null]";
          } else if (pArg instanceof String && ((String) pArg).length() == 0) {
              return "\"\"";
          } else if (pArg instanceof JSONAware) {
              return ((JSONAware) pArg).toJSONString();
          } else {
              return pArg.toString();
          }
      }
docs: null escape used for GET requests