title: htaccess 'Header unset Last-Modified' caching issue
body: <p>Im trying to set up some cache control options in my htaccess file.</p>
  
  <p>At the moment it looks like this:</p>
  
  <pre><code>&lt;FilesMatch "\.(flv|gif|jpg|jpeg|png|ico|swf|css|js|html|pdf)$"&gt;
  Header set Cache-Control "max-age=2592000, public, must-revalidate"
  Header unset ETag
  FileETag None
  &lt;/FilesMatch&gt;
  </code></pre>
  
  <p>However I read about (and wanted to add) Header unset Last-Modified, so it would be something like:</p>
  
  <pre><code>&lt;FilesMatch "\.(flv|gif|jpg|jpeg|png|ico|swf|css|js|html|pdf)$"&gt;
  Header set Cache-Control "max-age=2592000, public, must-revalidate"
  Header unset Last-Modified
  Header unset ETag
  FileETag None
  &lt;/FilesMatch&gt;
  </code></pre>
  
  <p>However, using this (according to Firebug) doesnt make anything load from the cache at all (whereas the first technique loads everything)</p>
  
  <p>Am I doing something wrong? The syntax seems to be right.</p>
  
  <p>A.</p>