title: set cache-control to external resources?
body: <p>@tools.pingdom.com I get a warning in leverage cache-control because of these resources:</p>
  
  <pre><code>http://code.jquery.com/jquery-1.6.2.min.js
  http://www.google-analytics.com/ga.js
  http://edge.sharethis.com/images/spinner.gif
  http://w.sharethis.com/button/buttons.js
  </code></pre>
  
  <p>Which are not in my host.</p>
  
  <p>What can I do about this?</p>
  
  <p>This is the beginning of my htaccess:</p>
  
  <pre><code># 480 weeks
  &lt;FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|css|swf)$"&gt;
  Header set Cache-Control "max-age=290304000, public"
  &lt;/FilesMatch&gt;
  
  # 1 weeks
  &lt;FilesMatch "\.(js)$"&gt;
  Header set Cache-Control "max-age=604800, public"
  &lt;/FilesMatch&gt;
  </code></pre>