This behavior is deprecated, but you should not disable or remove it if present.

Applies Akamai's Fast Purge feature to selected edge content, invalidating it within approximately five seconds. This behavior sends an If-Modified-Since request to the origin for subsequent requests, replacing it with origin content if its timestamp is more recent. Otherwise if the origin lacks a Last-Modified header, it sends a simple GET request. Note that this behavior does not simply delete content if more recent origin content is unavailable. See the Fast Purge API for an independent way to invalidate selected sets of content, and for more information on the feature.


When enabled, forces a validation test for all edge content to which the behavior applies.