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78 Intel NetStructure Cache Appliance Administrator’s Guide
The following table shows the options:
Option Description
Options to Verify freshness Choosing this option lets you configure how
the appliance asks the original content server
to verify the freshness of objects (revalidate
them) before serving them.
Select from one of the following options and
press Enter. After pressing Enter press
CTRL-X to save your changes and return to
the previous screen.
❚ When The Object Has Expired—The
appliance revalidates objects with explicit
expiration dates after they expire.
Otherwise, it uses heuristic methods to
evaluate freshness and revalidates the
object should it be stale.
❚ When The Object Has Expired Or Has No
Expiry Date—The appliance revalidates
objects with explicit expiration dates after
they expire. All other documents are
revalidated before serving.
❚ Always—The appliance always revalidates
objects before serving them.
❚ Never—The appliance never checks object
freshness.
Freshness information Specifies the minimum freshness information
required when considering to cache a
document.
Select from one of the following options and
press Enter. After pressing Enter press
CTRL-X to save your changes and return to
the previous screen.
❚ An Explicit Lifetime—The appliance only
caches objects with Expires headers or
Cache-Control: max-age headers.
❚ A Last Modified Time—The appliance only
caches objects with Expires headers, or
Cache-Control: max-age headers,
or Last-Modified headers.
❚ Nothing—The appliance caches
documents regardless of freshness
headers.