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10.5.63. Cache Directives
A number of commented cache directives are supplied by the default Apache HTTP Server configuration file. In most cases, uncommenting these lines by removing the hash mark (
#
) from the beginning of the line is sufficient. The following, however, is a list of some of the more important cache-related directives.
CacheEnable
— Specifies whether the cache is a disk, memory, or file descriptor cache. By defaultCacheEnable
configures a disk cache for URLs at or below/
.CacheRoot
— Specifies the name of the directory containing cached files. The defaultCacheRoot
is the/var/httpd/proxy/
directory.CacheSize
— Specifies how much space the cache can use in kilobytes. The defaultCacheSize
is5
KB.
The following is a list of some of the other common cache-related directives.
CacheMaxExpire
— Specifies how long HTML documents are retained (without a reload from the originating Web server) in the cache. The default is24
hours (86400
seconds).CacheLastModifiedFactor
— Specifies the creation of an expiry (expiration) date for a document which did not come from its originating server with its own expiry set. The defaultCacheLastModifiedFactor
is set to0.1
, meaning that the expiry date for such documents equals one-tenth of the amount of time since the document was last modified.CacheDefaultExpire
— Specifies the expiry time in hours for a document that was received using a protocol that does not support expiry times. The default is set to1
hour (3600
seconds).NoProxy
— Specifies a space-separated list of subnets, IP addresses, domains, or hosts whose content is not cached. This setting is most useful for Intranet sites.