try {
    if (
        navigator.serviceWorker &&
        navigator.serviceWorker.getRegistrations &&
        location.protocol === 'https:'
    ) {
        // remove all service workers
        navigator.serviceWorker
            .getRegistrations()
            .then(function (registrations) {
                if (registrations && registrations.length) {
                    console.log('unregistering service workers');
                    registrations.forEach(function (registration) {
                        registration.unregister();
                    });
                }
            });
        // clear caches
        if (caches) {
            caches.keys().then(function (keyList) {
                if (keyList && keyList.length) {
                    console.log('deleting caches');
                    keyList.forEach(function (key) {
                        if (key && key.indexOf('druntime') === 0) {
                            caches.delete(key);
                        }
                    });
                }
            });
        }
    }
} catch (err) {
    // not a secured location
}