Evaluates the "conditional HTTP request headers" to tell a client
if it could reuse its existing cache entry for a requested page.
This is believed to reduce traffic and also speed up some
applications. However it is still rather untested and could anyhow
lead to some problems (never updating pages for some broken
browsers). The evaluated headers include "If-Unmodified-Since:"
which corresponds to the "Last-Modified:" answer header ewiki
always sends.

However this will only work, if you disable EWIKI_NOCACHE - but
then some browsers will never see updated pages, if they were 
misconfigured to not refetch pages, once they got into the internal
browser cache. (But on the other hand, that is users fault ;)
prev << "lib/cache"
next >> "lib/mime_magic"

You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.