Apache Reference: mod_proxy, CacheRoot

CacheRoot

Filesystem Root of the Proxy Document Cache
Syntax: CacheRoot A
Example: CacheRoot /usr/local/apache/var/cache
Since: Apache 1.1

This directive configures directory to be the location where the proxy stores cached documents. Using this directive implicitly enables caching. If no CacheRoot is defined, proxy functionality will be available if Proxy==Requests are set to ``on'', but no caching will be available.