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Surrogate-Control

Alternative to Cache-Control response header for CDNs and reverse proxies.

Fastly reads this header from responses. It is proprietary to Fastly.

Fastly processes Surrogate-Control in a similar way to Cache-Control in order to determine the initial TTL (freshness) of a resource, but will prefer Surrogate-Control over Cache-Control if both exist.

Example

Cache-Control: max-age=0
Surrogate-Control: max-age=86400, stale-while-revalidate=60