code: public void decodeQueryTo(MultiMap<String> parameters, Charset encoding) throws UnsupportedEncodingException {
          if (_query == null)
              return;
  
          if (encoding == null || StandardCharsets.UTF_8.equals(encoding))
              UrlEncoded.decodeUtf8To(_query, parameters);
          else
              UrlEncoded.decodeTo(_query, parameters, encoding);
      }
docs: /* ------------------------------------------------------------