CacheRoot

Syntax: CacheRoot <directory>
Default: None
Context: server config, virtual host
Override: Not applicable
Status: Base
Module: mod_proxy
Compatibility: CacheRoot is only available in Apache 1.1 and later.

Sets the name of the directory to contain cache files; this must be writable by the httpd server. (see the User directive).
Setting CacheRoot enables proxy cacheing; without defining a CacheRoot, proxy functionality will be available if ProxyRequests are set to On, but no cacheing will be available.