class CaselessMultivaluedMap implements ExtMultivaluedMap<String, T>, Serializable {

    @Override
    public Set<String> keySet() {
        if (keys == null) {
            keys = new KeySet();
        }
        return keys;
    }

    public  CaselessMultivaluedMap();
    public  CaselessMultivaluedMap(int capacity);
    public  CaselessMultivaluedMap(Map<String, List<T>> m);

}