Fortinet FortiGate Series Administration Manual page 694

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Changing web cache settings

Cache Expired

Applies only to type-1 objects. When this option is selected, expired type-1

objects are cached (if all other conditions make the object cacheable).

Revalidated Pragma-

The pragma-no-cache (PNC) header in a client's request can affect the

efficiency of the FortiGate unit's bandwidth. If you do not want to completely

ignore PNC in client requests (which you can do by selecting to ignore

Pragma-no-cache, above), you can nonetheless lower the impact on the

bandwidth by selecting Revalidate Pragma-no-cache. When this option is

selected, a client's non-conditional PNC-GET request results in a conditional

GET request sent to the OCS if the object is already in the cache. This gives

the OCS a chance to return the 304 Not Modified response, which consumes

less server-side bandwidth, because the OCS has not been forced to

otherwise return full content. By default, Revalidate Pragma-no-cache is

disabled and is not affected by changes in the top-level profile. When the

Substitute Get for PNC configuration is enabled, the revalidate PNC

configuration has no effect.

Most download managers make byte-range requests with a PNC header. To

serve such requests from the cache, you should also configure byte-range

support when you configure the Revalidate pragma-no-cache option.

WAN optimization and web caching

FortiGate Version 4.0 MR1 Administration Guide

01-410-89802-20090903

http://docs.fortinet.com/