List list = (List) _headers.get(name); if (list == null) { list = new LinkedList(); _headers.put(name, list); } list.add(new Header(name, value));
add(new Header(name, value), null);
    public void addHeader(String name, String value) {        List list = (List) _headers.get(name);        if (list == null) {            list = new LinkedList();            _headers.put(name, list);        }        list.add(new Header(name, value));    }