BOOL, can be read and set, but not unset.

Available inall subroutines.

Whether or not the response is a stale cache hit.

Stale hits are caused by asynchronous revalidation, backend failure, or an explicit return(deliver_stale).

To learn more, refer to staleness and revalidation, resp.stale.is_error, and resp.stale.is_revalidating.

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