Bill Stoddard wrote:
To get mod_cache/mod_mem_cache (I know little or nothing about mod_disk_cache) really performing competatively against best-of-breed caches will require bypassing output filters (and prebuilding headers) and possibly bypassing or at least reworking input filters.
The initial idea was that the CACHE_SAVE filter would run as close to the network as possible (to cache as much of the input filters as possible), but over time people moved filters in front of CACHE_SAVE for various reasons, which has performance issues.
The ability to cache variants was made so that both an uncompressed and compressed variant of the same resource could be cached at the same time.
This means that a browser that does not support compressed content isn't going to invalidate the contents of the cache, hurting performance.
Regards, Graham --
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