@Test
 public void testAddDateHeaders() {
   MyResponse r = new MyResponse(c);
   Long l1 = System.currentTimeMillis();
   Long l2 = System.currentTimeMillis() - 100000;
   r.setDateHeader("d", l1);
   r.addDateHeader("d", l2);
   assertEquals(r.m_props.get("d"), l1 + "," + l2);
 }