Cache-Control Header Treatment

Category: Caching

Purpose: Controls the generation of Cache-Control headers by the edge server when the External Max-Age feature is active.

The easiest way to achieve this type of configuration is to place the External Max-Age and the Cache-Control Header Treatment features in the same statement.

Value	Result
Pass Through	Ensures that the following actions will take place: Ensures that the Cache-Control header produced by the External Max-Age feature is never added to the response. If the origin server produces a Cache-Control header, it will pass through to the end-user. If the origin server does not set a Cache-Control header, then this mode may cause the response to not include a Cache-Control header.
Overwrite	Ensures that the following actions will take place: Overwrites the Cache-Control header generated by the origin server. Adds the Cache-Control header produced by the External Max-Age feature to the response.
Add if Missing	If a Cache-Control header was not received from the origin server, then this option adds the Cache-Control header produced by the External Max-Age feature. This option is useful for ensuring that all assets will be assigned a Cache-Control header.
Remove	This option ensures that a Cache-Control header is not included with the header response. If a Cache-Control header has already been assigned, then it will be stripped from the header response.

Default Behavior: Overwrite.