protected static final String USER_AGENT = "user-agent";

    /** The request attribute key for storing cached user agent type */
    protected static final String USER_AGENT_TYPE = "ViewHelper.UserAgent";

    /**
     * Determines the user agent type from the current HTTP request.
     * The method analyzes the User-Agent header to categorize the browser type

    private static final String QUERY_PROCESSOR = "queryProcessor";

    private static final String SAMBA_HELPER = "sambaHelper";

    private static final String VIEW_HELPER = "viewHelper";

    private static final String SYSTEM_HELPER = "systemHelper";

    private static final String CRAWLER_PROPERTIES = "systemProperties";

        }
        if (doc == null) {
            saveError(messages -> messages.addErrorsDocidNotFound(GLOBAL, form.docId));
            return redirect(ErrorAction.class);
        }

        final String content = viewHelper.createCacheContent(doc, form.hq);
        if (content == null) {
            saveError(messages -> messages.addErrorsDocidNotFound(GLOBAL, form.docId));
            return redirect(ErrorAction.class);
        }

    }

    /**
     * The search page.
     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    public HtmlResponse search(final SearchForm form) {
        if (viewHelper.isUseSession()) {
            LaRequestUtil.getOptionalRequest().ifPresent(request -> {
                final HttpSession session = request.getSession(false);
                if (session != null && form.num != null) {

        assertTrue(ComponentUtil.hasQueryParser());
    }

    public void test_hasViewHelper() {
        assertFalse(ComponentUtil.hasViewHelper());

        ComponentUtil.register(new Object(), "viewHelper");
        assertTrue(ComponentUtil.hasViewHelper());
    }

    public void test_hasQueryHelper() {
        assertFalse(ComponentUtil.hasQueryHelper());