The Application Cache, also known as AppCache, is deprecated.
How the Lighthouse Application Cache audit fails #
Lighthouse flags pages that use the Application Cache:
This audit fails when Lighthouse finds a reference to the Application Cache manifest in a page's
<html> tag. For example, this markup causes the audit to fail:
Each Best Practices audit is weighted equally in the Lighthouse Best Practices Score. Learn more in The Best Practices score.
Use the Cache API instead of the Application Cache #
To migrate from the Application Cache to service workers, consider using the sw-appcache-behavior library. This library generates a service-worker-based implementation of the behavior defined in an Application Cache manifest.
See the Current page does not respond with a 200 when offline post for more information about using service workers to make your site work offline.