docs: public static Map<String, List<String>> extractParametersFromQueryString(String queryString) {
      if (queryString == null) {
        return emptyMap();
      }
  
      // If there is no ? character at the front of the string, append it.
      return extractParametersFromUrl(
        format("restfb://url%s", queryString.startsWith("?") ? queryString : "?" + queryString));
    }