Conditional based cache control

[Ish Sookun]

Hello,

I need to write a config that will set the "Cache-Control" value of a
resource based on the age of the latter returned by the origin server.
E.g if a resource is older than X hours then the Cache-Control should
have a specific value.

Anybody ever done that?

I am hoping to be able to find something by starting with the
"Last-Modified" value that is returned by the origin server.

Regards,

Ish Sookun