* For IPv4 addresses, returns the address as-is.
     *
     * @param address the InetAddress to format
     * @return the URL-safe host string
     */
    public static String getUrlHost(final InetAddress address) {
        if (address == null) {
            return null;
        }
        if (address instanceof Inet6Address) {
            final String hostAddress = address.getHostAddress();

        assertEquals("127.0.0.1", IpAddressUtil.getUrlHost(ipv4Localhost));

        // IPv6 localhost
        InetAddress ipv6Localhost = InetAddress.getByName("::1");
        assertEquals("[::1]", IpAddressUtil.getUrlHost(ipv6Localhost));

        // Null
        assertNull(IpAddressUtil.getUrlHost(null));
    }

    @Test