title: gzip working but YSlow indicates it's not
body: <p>I'm getting used to <strong>Firebug</strong> and <strong>YSlow</strong> in particular. One of the things I'm looking at is the gzip compression. YSlow still gives my site an "F" and indicates that my CSS and JavaScript files are not being compressed.</p>
  
  <p>However, if I run an external gzip test against my site (such as <code>http://www.gidnetwork.com/tools/gzip-test.php</code>) it tells me that gzip is working and gives me my savings, although I think this may just be the HTML.</p>
  
  <p>This is the relevant section of my <code>.htaccess</code> file:</p>
  
  <pre><code>&lt;IfModule mod_gzip.c&gt;
      mod_gzip_on       Yes
      mod_gzip_dechunk  Yes
      mod_gzip_item_include file      \.css$
      mod_gzip_item_include file      \.(html?|txt|js|php|pl|jpg|png|gif)$
      mod_gzip_item_include handler   ^cgi-script$
      mod_gzip_item_include mime      ^text/.*
      mod_gzip_item_include mime      ^application/x-javascript.*
      mod_gzip_item_exclude mime      ^image/.*
      mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
  &lt;/IfModule&gt;
  </code></pre>
  
  <p>Why does YSlow not agree with the external gzip test?</p>