Property Manager Name: Downstream Cacheability
Specify the caching instructions the edge server sends to the end user’s client or client proxies. By default, the cache’s duration is whichever is less: the remaining lifetime of the edge cache, or what the origin’s header specifies. If the origin is set to no-store or bypass-cache, edge servers send cache-busting headers downstream to prevent downstream caching.
- behavior (enum string): Specify the caching instructions the edge server sends to the end user’s client. It accepts the following values:
- ALLOW: The value of allowBehavior chooses the caching method and headers to send to the client.
- MUST_REVALIDATE: This equates to a Cache-Control: no-cache header, which allows caching but forces the client browser to send an if-modified-since request each time it requests the object.
- BUST: Sends cache-busting headers downstream.
- TUNNEL_ORIGIN: This passes Cache-Control and Expires headers from the origin to the downstream client.
- NONE: Don’t send any caching headers. Allow client browsers to cache content according to their own default settings.
- allowBehavior (enum string): Specify how the edge server calculates the downstream cache by setting the value of the Expires header:
- FROM_VALUE sends the value of the edge cache’s duration.
- FROM_MAX_AGE sends the cache:max-age value applied to the object, without evaluating the cache’s duration.
- LESSER sends the lesser value of what the origin specifies and the edge cache’s remaining duration. This is the default behavior.
- GREATER sends the greater value of what the origin specifies and the edge cache’s remaining duration.
- REMAINING_LIFETIME sends the value of the edge cache’s remaining duration, without comparing it to the origin’s headers.
- PASS_ORIGIN sends the value of the origin’s header, without evaluating the edge cache’s duration.
- ttl (duration string): Set the duration of the cache. Setting the value to 0 equates to a no-cache header that forces revalidation.
- sendHeaders (enum string): Specifies the HTTP headers to include in the response to the client:
- PASS_ORIGIN sends the same set of Cache-Control and Expires headers received from the origin.
- CACHE_CONTROL sends only the origin’s Cache-Control header.
- EXPIRES sends only the origin’s Expires header.
- CACHE_CONTROL_AND_EXPIRES sends both Cache-Control and Expires header.
- NONE strips both headers.
- sendPrivate (boolean): When enabled, adds a Cache-Control: private header to prevent objects from being cached in a shared caching proxy.