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This capability requires Rules Engine - Advanced Rules which must be purchased separately. Contact your CDN account manager to activate it.
Purpose: Determines whether cached content will be eligible for early revalidation before its TTL expires.
Define the amount of time prior to the expiration of the requested content's TTL during which it will be eligible for early revalidation.
Default Behavior: Revalidation may only take place after the cached content's TTL has expired.