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Purpose: Determines the max-age interval for browser to edge server cache revalidation. In other words, the amount of time that will pass before a browser can check for a new version of an asset from an edge server.
Enabling this feature will generate Cache-Control:max-age and Expires headers from our edge servers and send them to the HTTP client. By default, these headers will overwrite those created by the origin server. However, the Cache-Control Header Treatment and the Expires Header Treatment features may be used to alter this behavior.
Configure this feature by specifying an integer value and then selecting the desired time unit (i.e., seconds, minutes, hours, etc.). This value defines the external max-age interval that will be applied.
Default Behavior: The Cache-Control/Expires headers cached with the response of the origin server will pass through to the browser.