Web Gateway 7.1.5 Product Guide - McAfee

Bypass lists for web caching
Proxies and caching
Web caching 3
You can fill bypass list with entries for web objects, such as URLs, media types, and others, to exclude
these objects from caching. This section tells you how to work with these lists and describes some
sample lists.
There must be rules in a web cache rule set that use bypass lists and let the rules for reading from and
writing to the cache not be processed.
Note: This means that when you edit a bypass list, you also modify the rule that uses it. You should therefore
make sure you know which rule uses a list that you edit. You can do this, for example, by reviewing the rules
of the web cache rule set to see which list names appear in rule names and criteria.
When you import a web cache rule set from the library, bypass lists are implemented with the rule set.
You can edit these lists and also create lists of your own.
The procedures used to maintain bypass lists differ according to the list type. For example, you can add
wildcard expressions to a whitelist for URLs by typing them into the list. For example, you can add URLs
to a bypass list for URLs by typing them into the list. When adding media types, however, you select
them from folders with media type groups.
For more information one the sample lists, see Sample lists for web caching.
For the list activities, see Add a wildcard expression for URLs to a web cache bypassing list, and Add a
media type to a web cache bypassing list.
Sample lists for web caching
This section describes two sample bypass lists for use with the web cache rules.
When you import the Web Cache rule set from the library, these lists are also imported. You can find
them on the Lists tab of the Policy top-level menu, sorted by their types and names.
For general information on how to maintain lists, see List maintenance.
Web Cache URL Bypass List
Library list of wildcard expressions for URLs that should not be read to or written from the web cache.
Type: Wildcard Expression
The list is initially empty.
The following table describes the list entries.
Table 3-13 Web Cache URL Bypass List
Option Definition
Wildcard Expression Wildcard expresssion for URLs that should not be cached
Comment Plain-text comment on the wildcard expression
Web Cache Media Type Blocklist
Library list of media types that should not be read to or written from the web cache.
Type: Media type
Initial entries: application/mpegurl — MP3 Playlist File
application/x-pn-realaudio — RealMedia streaming file
video/x-la-asf — Streaming Audio/Video File
The following table describes the list entries.
Table 3-14 Web Cache Media Type Blocklist
Option Definition
Media type Media type that should not be cached
Comment Plain-text comment on the media type
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