assertTrue(sitemapsHelper.isValidUrl("http://www.example.com"));
        assertTrue(sitemapsHelper.isValidUrl("https://www.example.com"));

        // Invalid URL
        assertFalse(sitemapsHelper.isValidUrl(null));
        assertFalse(sitemapsHelper.isValidUrl(""));
        assertFalse(sitemapsHelper.isValidUrl("ftp://www.example.com"));
        assertFalse(sitemapsHelper.isValidUrl("http://" + "a".repeat(2048)));

    }

    /**
     * Validates a URL length according to sitemap specification.
     * @param url the URL to validate
     * @return true if valid, false otherwise
     */
    protected boolean isValidUrl(final String url) {
        if (url == null || url.isEmpty()) {
            return false;
        }
        if (url.length() > MAX_URL_LENGTH) {
            if (logger.isDebugEnabled()) {