Define a custom Cache-Control
header, usually being private or public;
Parameters
- control
the primary cache control setting
- max_age
the max-age in seconds, suggesting how long the cache entry is valid on the client side
- must_revalidate
whether the cached entity should be revalidated by the client for every request
Return Values
Returns TRUE
on success, or FALSE
if control does not match one of public, private or no-cache.