title: configuring e-tags
body: <p>I am using Yslow as a simple speed benchmarking tool and I came across a really confusing concept. The E-tag</p>
  
  <p>So the main problem is : How do I configure E-tags? my grade in yslow says:</p>
  
  <p>There are 19 components with misconfigured ETags</p>
  
  <pre><code>* http://thehotelinventory.com/media/js/jquery.min.js
  * http://thehotelinventory.com/media/js/jquery.colorbox.min.js
  * http://thehotelinventory.com/media/js/easyslider.min.js
  * http://thehotelinventory.com/media/js/jquery.tools.min.js
  * http://thehotelinventory.com/media/js/custom.min.js
  * http://thehotelinventory.com/media/js/jquery.validate.min.js
  * http://thehotelinventory.com/media/images/colorbox/loading_background.png
  * http://thehotelinventory.com/media/images/productheaderbg.jpg
  * http://thehotelinventory.com/media/images/buttons/field-bg. //etc
  </code></pre>
  
  <p>I browsed through the developer.yahoo.com guidelines on website optimization yet I can't really understand the thing with e-tags</p>