This is an example of a strong caching policy for a versioned static asset: Cache-Control: max-age=31536000, immutable This instructs the browser to cache the associated asset up to one year. We’ve also added an additional immutable directive as a further optimization, which tells supporting browsers, “Hey! This file will never change. Don’t bother checking with the server to see if it has!”688-693 ↱
![Responsible JavaScript](/_next/image?url=https%3A%2F%2Fstorage.googleapis.com%2Fsawyer-highlights.appspot.com%2Fvolume%252Fcovers%252F978-1-952616-11-2.jpeg&w=3840&q=75)
Responsible JavaScript
Jeremy Wagner