/**
     * 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) {

        ViewHelper viewHelper = new ViewHelper();
        viewHelper.init();

        viewHelper.setUseSession(false);
        assertFalse(viewHelper.isUseSession());

        viewHelper.setUseSession(true);
        assertTrue(viewHelper.isUseSession());

        viewHelper.addInitFacetParam("key1", "value1");
        assertEquals("key1", viewHelper.getInitFacetParamMap().get("value1"));

        }).orElse(new TextFragment[0]);
    }

    /**
     * Checks if HTTP sessions are enabled.
     *
     * @return true if sessions are used, false otherwise
     */
    public boolean isUseSession() {
        return useSession;
    }

    /**
     * Sets whether to use HTTP sessions.
     *
     * @param useSession true to enable sessions, false to disable
     */