Progressive Web Application Development by Example

Network falling back to cache

If you have a time-sensitive network resource that you always want to hit the network, you should also consider using the network falling back to cache strategy. Here, you will always try to access the network, but if the network is inaccessible, then you have the built-in option to retrieve the most recently cached version of the file.

If it is critical that the resource is fresh, I advise that you visually alert the customer of the time that is associated with that response. The following image shows the interactions involved in this process:

This pattern can also be to provide a fallback for any asset that ...