headers.put(key, old + ", " + value);
super.put(key, old + ", " + value);
  private void addValue(String name, String value)  {    Header key = new Header(name);    String old = (String) headers.get(key);    if (old == null)      {        headers.put(key, value);      }    else      {        headers.put(key, old + ", " + value);      }  }