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Stale-while-revalidate.

also: stale while revalidate · SWR · serve stale

Serving the stale cached value immediately while refreshing it in the background, so no user waits on a miss.

the two-minute refresher

Request → stale hit → fast response, and in parallel a background refresh.
The next user gets fresh data.
Also an HTTP directive: Cache-Control: stale-while-revalidate=60.
Only where slightly stale data is acceptable.

Where the course teaches it

W04 · Day 3Thundering Herdlearn it →W04 · Day 5Multi-Tier Cachingrevisit →

Related concepts

Thundering herd
TTL
Cache-Control