Streaming Media Supplement sa2150 and sa2250

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Chapter 5 Understanding Media-IXT and QuickTime
Understanding selective caching and QuickTime
Using selective caching, you can specify criteria to determine whether content is proxyable or not, and
cacheable or not.
When content is not proxyable, Media-IXT denies the client connection, with an appropriate message to the
client (if possible).
When content is not cacheable, Media-IXT goes into passthrough mode and proxies, but does not cache, the
content.
See the HP Cache Server Appliance Administrator Guide for more information about selective caching.
Two configuration files control selective caching:
• cache.config controls cacheability
• filter.config controls proxyability
You must edit cache.config and filter.config manually, adding selective caching rules to the files.
Always use hostnames (in Fully Qualified Domain Name form), not IP addresses, in selective caching rules.
Rules containing IP addresses are likely to be ignored by Media-IXT.
You can, optionally, add an RNI or QT tag to any selective caching rule.
This permits you to apply one rule to QuickTime content and another for RealNetworks content.
The format for the tag is to add tag= to the end of the rule, followed by the tag value of RNI or QT.
Non-proxyable content does not create log entries. Non-cacheable content does create log entries.
Understanding CDS preload and QuickTime
Media-IXT 4.x does not support CDS preload of QuickTime content.
Understanding authentication and QuickTime
Media-IXT does not support proxy caching of authenticated QuickTime content.