Cisco Cisco Web Security Appliance S190 Mode D'Emploi
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AsyncOS 10.0 for Cisco Web Security Appliances User Guide
Chapter 13 Configuring Security Services
Caching
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AsyncOS only caches objects if the entire object downloads. If malware is blocked during scanning,
the whole object is not downloaded and therefore is not cached.
the whole object is not downloaded and therefore is not cached.
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AsyncOS scans content whether it is retrieved from the server or from the web cache.
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The length of time that content is cached varies with many factors - there is no default.
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AsyncOS rescans content when signatures are updated.