It enables a 2-tier caching architecture that allows dynamic processing of cached content using the output-filter chain (mod_include, mod_deflate etc).
It also uses a targeted system for expiry of content using an HTTP REST-like interface.
The primary function of this module is to act as an Apache Filter that saves the content of the bucket-brigades passed throuh the filter to a location on disk.
Only mod_proxy retrieved content is filtered.
The secondary function is to act on HTTP DELETE requests to delete content from the same area of disk.
This module allows SSI processing to occur after cacheing has taken place.
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