/** Tests referrer reference getting/setting. */
 public void testReferrerRef() throws Exception {
   final Request request = getRequest();
   String uri = "http://www.restlet.org/";
   Reference reference = getReference(uri);
   request.setReferrerRef(uri);
   assertEquals(reference, request.getReferrerRef());
   uri = "http://www.restlet.org/something";
   reference = getReference(uri);
   request.setReferrerRef(reference);
   assertEquals(reference, request.getReferrerRef());
 }