## CacheLastModifiedFactor

Syntax: CacheLastModifiedFactor <factor>
Default: `CacheLastModifiedFactor 0.1`
Context: server config, virtual host
Override: Not applicable
Status: Base
Module: mod_proxy
Compatibility: CacheLastModifiedFactor is only available in Apache 1.1 and later.

If the origin HTTP server did not supply an expiry date for the document, then estimate one using the formula

      expiry-period = time-since-last-modification * <factor>

For example, if the document was last modified 10 hours ago, and <factor> is 0.1, then the expiry period will be set to 10*0.1 = 1 hour.

If the expiry-period would be longer than that set by CacheMaxExpire, then the latter takes precedence.