protected HeaderProperty getHeader(List lista, String key) {
    HeaderProperty res = null;

    if (lista != null) {
      for (int i = 0; i < lista.size(); i++) {
        HeaderProperty hp = (HeaderProperty) lista.get(i);
        if (key.equals(hp.getKey())) {
          res = hp;
          break;
        }
      }
    }

    return res;
  }