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Hierarchical Caching > HTTP cache hierarchies
HTTP cache hierarchies
Help | Content Gateway | Version 8.0.x
In an HTTP cache hierarchy, if a Content Gateway node cannot find a requested object in its cache, it can search a parent cache—which itself can search other caches—before resorting to retrieving the object from the origin server.
You can configure a Content Gateway node to use one or more HTTP parent caches, so that if one parent is unavailable, another parent can service requests. This is called parent failover and is described in Parent failover.
 
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Hierarchical Caching > HTTP cache hierarchies
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