smarty/docs/en/programmers/api-variables/variable-cache-modified-check.xml

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<sect1 id="variable.cache.modified.check">
<title>$cache_modified_check</title>
<para>
  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
  <link linkend="language.function.insert"><command>{insert}</command></link>
  tags.
</para>

  <para>
  See also
  <link linkend="variable.caching">$caching</link>,
   <link linkend="variable.cache.lifetime">$cache_lifetime</link>,
  <link linkend="variable.cache.handler.func">$cache_handler_func</link>,
  and
  <link linkend="caching">Caching section</link>.
  </para>

</sect1>

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