* 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

            final String hostname = ia.getHostName();
            if (StringUtil.isNotBlank(hostname)) {
                buf.append(hostname);
            }
            final String ip = IpAddressUtil.getUrlHost(ia);
            if (StringUtil.isNotBlank(ip)) {
                if (buf.length() > 0) {
                    buf.append(" : ");
                }
                buf.append(ip);
            }

            return env.get("COMPUTERNAME");
        }
        if (env.containsKey("HOSTNAME")) {
            return env.get("HOSTNAME");
        }
        try {
            return IpAddressUtil.getUrlHost(InetAddress.getLocalHost());
        } catch (final UnknownHostException e) {
            logger.debug("Unknown hostname.", e);
        }
        return "Unknown";
    }

    /**