final Map<String, List<String>> paramListMap = new HashMap<>();
        final String[] pairs = queryString.split("&");
        try {
            for (final String pair : pairs) {
                final int pos = pair.indexOf('=');
                if (pos >= 0) {
                    final String key = urlCodec.decode(pair.substring(0, pos), enc);

        remove(pairs, rep.getType());
        pairs.add(rep);
    }


    /**
     * 
     * @param pairs
     * @return encoded avpairs
     */
    public static byte[] encode ( List<AvPair> pairs ) {
        int size = 0;
        for ( AvPair p : pairs ) {
            size += 4 + p.getRaw().length;
        }
        size += 4;

        byte[] enc = new byte[size];