* @param form the form containing new configuration values
     */
    public static void updateConfig(final FessConfig fessConfig, final EditForm form) {
        fessConfig.setLoginRequired(isCheckboxEnabled(form.loginRequired));
        fessConfig.setResultCollapsed(isCheckboxEnabled(form.resultCollapsed));
        fessConfig.setLoginLinkEnabled(isCheckboxEnabled(form.loginLink));

    }

    default String getVirtualHostValue() {
        return getSystemProperty(Constants.VIRTUAL_HOST_VALUE_PROPERTY, getVirtualHostHeaders());
    }

    default void setLoginRequired(final boolean value) {
        setSystemPropertyAsBoolean(Constants.LOGIN_REQUIRED_PROPERTY, value);
    }

    default boolean isLoginRequired() {