title: header expire on javascript files not working
body: <p>I can't get the expire header on JS files to work properly.. It works fine on eg CSS files!?</p>
  
  <p>Could anybody tell me what Im doing wrong? :(</p>
  
  <h1>htaccess</h1>
  
  <pre><code>ExpiresActive on
  ExpiresDefault A0
  ExpiresByType image/gif A29030400
  ExpiresByType image/jpeg A29030400
  ExpiresByType image/png A29030400
  ExpiresByType text/css A29030400
  ExpiresByType text/javascript A29030400
  ExpiresByType application/x-javascript A29030400
  </code></pre>
  
  <h1>header on CSS file</h1>
  
  <pre><code>Cache-Control   max-age=29030400
  Connection  Keep-Alive
  Date    Sun, 14 Oct 2012 12:06:45 GMT
  Etag    "be-4cbcf2ad48b40"
  Expires Sun, 15 Sep 2013 12:06:45 GMT
  Keep-Alive  timeout=5, max=97
  Server  Apache/2.4.2 (Win64) PHP/5.4.3
  </code></pre>
  
  <h1>header on JS file</h1>
  
  <pre><code>Cache-Control   max-age=0
  Connection  Keep-Alive
  Date    Sun, 14 Oct 2012 12:06:45 GMT
  Etag    "1ad-4cc00d069f493"
  Expires Sun, 14 Oct 2012 12:06:45 GMT
  Keep-Alive  timeout=5, max=99
  Server  Apache/2.4.2 (Win64) PHP/5.4.3
  </code></pre>