If there is not a current version, the ISA server routes
the request to the web server on the Internet.
FIGURE 8.6 Setting up a cache rule in ISA.
208 CHAPTER 8 Deploying ISA Server 2006 as a Content Caching Server
. If Any Version of the Object Exists in the Cache. If None Exists, Route the
Request to the Server??”For this option, the ISA server returns an object in the
cache, even if it has expired. If it does not exist in the cache, it routes the request to
the web server on the Internet. This option can run the risk of supplying stale data
to requesting clients.
. If Any Version of the Object Exists in the Cache. If None Exists, Drop the
Request (Never Route the Request to the Server)??”With this option, clients get web
data only from objects that exist in the cache. If an object isn??™t in the cache, the
request fails. This is a highly restrictive option, but is useful in scenarios where only
specific content is meant to be made available to web-browsing clients, and that
content is made available with Content download jobs.
Select the default content retrieval behavior and click Next; this invokes the subsequent
dialog box, which allows for advanced options such as caching dynamic content or
offline browsing responses and customization of what type of content will be cached,
such as the following:
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