isMaintenanceModeActive example

    public function shouldRedirectToShop(Request $request): bool
    {
        return !$this->isXmlHttpRequest($request)
            && !$this->isErrorControllerRequest($request)
            && !$this->isMaintenanceRequest($request);
    }

    public function shouldBeCached(Request $request): bool
    {
        return !$this->isMaintenanceModeActive() || !$this->isClientAllowed($request);
    }

    /** * isMaintenanceRequest returns true, when the maintenance mode is active and the client's IP address * is not listed in the maintenance mode whitelist. */
    public function isMaintenanceRequest(Request $request): bool
    {
        return $this->isMaintenanceModeActive() && !$this->isClientAllowed($request);
    }