As we saw in the last section, when you update a service worker to a new version, you'll create a new cache in its install event handler. While there are open pages that are controlled by the previous version of the worker, you need to keep both caches, because the previous version needs its version of the cache. You can use the activate event to remove data from the previous caches.
WornHole is another solution to the same question that is how to control iPhone to PC? It is considered a bridge between mobile devices and the Desktop. It enables you to connect multiple phones simultaneously and supports both iOS and Android devices. If you are tired of switching many times, then you can use this app to cast and control your iPhone on a PC or Mac.
Amazon EC2 provides a truly elastic computing environment. Amazon EC2 enables you to increase or decrease capacity within minutes, not hours or days. You can commission one, hundreds or even thousands of server instances simultaneously. When you need more instances, you simply call RunInstances, and Amazon EC2 will typically set up your new instances in a matter of minutes. Of course, because this is all controlled with web service APIs, your application can automatically scale itself up and down depending on its needs.