Chapter 8 App and book distribution 73
Here’s an explanation of the Caching Server workow:
1 When an Apple device on a network with one or more Caching Servers requests content from
the iTunes Store or Software Update server, the device is referred to a Caching Server.
2 The Caching Server rst checks to see whether it already has the requested content in its
local cache.
•
If it does, it immediately begins serving the content to the device.
•
If the Caching Server doesn’t have the requested asset, it attempts to download the content
from another source. Caching Server 2 or later includes a peer replication feature that can
use other Caching Servers on the network, if those servers have already downloaded the
requested content.
3 As the Caching Server receives download data, it immediately relays the data to any devices that
have requested it and simultaneously caches a copy on the designated storage device.
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