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Caution The Aggressive mode should be used with caution, it violates the HTTP standard and may
lead to unwanted consequences.
Web Cache Panel Enable or Disable directing web traffic passing through the NSA/TZ
series appliance to the WXA Web Cache via the Enable Web Cache
checkbox.
When the Web Cache is enabled, NAT polices are automatically cre-
ated. If they cause any problems in your network, you can include or
exclude objects to fix it by using the following options:
• In the Client Inclusion Address Object drop-down menu you can
select the Address Object or Group that represents the local subnets
whose web traffic should be diverted via the Web Cache. You can also
choose “Any” and the traffic from any source IP address is forwarded
to the WXA.
• In the Server Exclusion Address Object drop-down menu you
can select the Address Object or Group that contains the destination
address of web servers for which traffic should not be diverted via the
Web Cache. If you select “None” no web server is excluded and all
appropriate traffic is sent via the WXA.
The Caching Strategy determines which objects are placed into the
web cache and how long they stay there. Three options are available
for the Caching Strategy: Minimal, Moderate, and Aggressive. The fol-
lowing describes the different Caching Strategies:
• Minimal - All objects are cached unless the HTTP header specifi-
cally says not to, such as “no cache” or an “expire” time that occurs in
the past.
• Moderate - This is the default web caching strategy. In Moderate
caching mode, the Web Cache keeps objects in the cache for longer
than in Minimal mode. The Web Cache also enforces a minimum age
of 7 days on objects that don't include any 'no caching' control options
(such as no-cache, no-store or an explicit expiry time) in the HTTP
header.
• Aggressive - In Aggressive mode, the Web Cache ignores explicit
expiry time (enforcing a minimum age of 7 days), reload and no-cache
options in HTTP headers.
Note: The Web Cache never caches any data marked as “private” or
“auth” (requiring authorisation to access) in the HTTP header.
When switching from Aggressive or Moderate mode to Minimal
mode, any already cached objects that do not meet the Minimal
caching strategy will be refreshed by the cache.
YouTube caching is implemented in both Moderate and
Aggressive caching modes.
Cache Status Panel Provides read-only data for the Following:
• Operational Status - Displays the operational status of the Web
Cache service.
• Web Requests - Displays the response time in a value of seconds.
• Cache Size - Displays the current size of the cache used by the
Web Cache.
• Cache Free Space - Displays the amount of disk space available to
the Web Cache.
• Number of Cached Objects - Displays the number of objects cur-
rently stored in the Web Cache.
Name Description