Web Gateway 7.1.5 Product Guide - McAfee

Web caching
Proxies and caching
Web caching 3
A web cache is provided on the appliance for storing web objects to speed up responses to client
requests. This section explains the handling of this cache.
Use of the web cache is controlled by rules for reading objects from it or writing them to it. This means
a rule set must must be implemented that contains such rules. Bypass lists can contain web objects
that should not be cached. In addition to this, the web cache must be enabled as an option of the
common proxy settings.
Rules for the web cache
Use of the appliance web cache is controlled by rules in a rule set. This section explains the handling of
a web cache rule set and describes a web cache rule set from the library.
To find out whether a web cache rule set is implemented on your appliance, review the system of rule
sets on the Rule Sets tab of the Policy top-level menu.
If none is implemented, you can import the Web Cache library rule set. After importing this rule set,
you can review and modify it on the Rule Sets tab to make it suit your network. Alternatively, you can
create a rule set with rules of your own.
A web cache rule set typically contains rules for reading objects from the cache and writing them to it.
Additionally, there can be bypass rules that exclude objects from being read or written.
For more information, see Import a rule set and Web caching.
Web Cache
This section describes the rules in the Web Cache library rule set.
For general information on understanding and handling rules, see Rules and rule sets.
Library rule set — Web Cache
Criteria — Always
Cycle — Requests (and IM) and responses
The following rule sets are nested in this rule set:
• Read from Cache
• Write to Cache
Read from Cache
This nested rule set enables the reading of web objects from the cache and forbids it for URLs that are
on a bypassing list.
Nested library rule set — Read from Cache
Criteria — Always
Cycles — Requests (and IM)
The rule set contains the following rules:
Skip caching URLs that are in Web Cache URL Bypass List
URL matches in list Web Cache URL Bypass List –> Stop Rule Set
The rule uses the URL property to check for requested URLs whether they are on the specified
bypass list. If they are, processing of the rule set stops. The rule that enables writing to the cache
is then not processed. Processing continues with the next rule set.
Note: The rule is not enabled by default.
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