If set to TRUE, Smarty will respect the If-Modified-Since
header sent from the client. If the cached file timestamp has
not changed since the last visit, then a '304: Not Modified'
header will be sent instead of the content. This works only on
cached content without
{insert}
tags.
See also
$caching,
$cache_lifetime,
$cache_handler_func,
and the
caching section.
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