code: public static void decodeTo(String content, MultiMap<String> map, String charset) {
          decodeTo(content, map, charset == null ? null : Charset.forName(charset));
      }
docs: Decoded parameters to Map.
  
  @param content the string containing the encoded parameters
  @param map     the MultiMap to put parsed query parameters into
  @param charset the charset to use for decoding