STRING, read-only.

Available in all subroutines.

Specifies if a given object has stale content in cache. Returns true or false.

Try it out

stale.exists is used in the following solution recipes, which show real world use cases. Click RUN to provision a Fastly service, execute the code on Fastly, and see how the function behaves.

Serve stale to search crawlers

Prioritize human traffic over search crawlers by serving stale content to crawlers.

Serve stale on origin failure

Deal with all potential scenarios for using stale content to satisfy requests when origin is unhealthy or misbehaving.

User contributed notes

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