Browser & Web Performance · Middle · Question 39 of 75

What does `Cache-Control: max-age=60, stale-while-revalidate=600` allow?

✓Correct answer: Fresh for 60 s; for the next 600 s a stale copy may be served immediately while it's revalidated in the background
2The browser revalidates every 60 s and blocks until the server answers
3The response is cached for 660 s and never revalidated

Explanation

Users get an instant response and the cache updates for the next request. It's a trade-off between freshness and speed.

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