code: @FFDCIgnore(NumberFormatException.class)
      private boolean isSuccessStatusCode(String s) {
          if (s == null) {
              return false;
          }
          if ("2XX".equals(s) || "default".equals(s)) {
              return true;
          }
          if (s.length() != 3) {
              return false;
          }
          try {
              final int i = Integer.parseInt(s);
              return i >= 200 && i <= 299;
          } catch (NumberFormatException nfe) {
              return false;
          }
      }
docs: /*
  Returns true if s = [200-299] or 2XX