public URLNormalizer removeWWW() {
        String host = toURL().getHost();
        String newHost = StringUtils.removeStartIgnoreCase(host, "www.");
        url = StringUtils.replaceOnce(url, host, newHost);
        return this;
    }
@Test
    public void testRemoveWWW() {
        s = "http://www.example.com/foo.html";
        t = "http://example.com/foo.html";
        assertEquals(t, n(s).removeWWW().toString());
        s = "http://wwwexample.com/foo.html";
        t = "http://wwwexample.com/foo.html";
        assertEquals(t, n(s).removeWWW().toString());
    }