title: how to check if Leverage browser caching is enabled
body: <p>I Was wondering if there exist an method using which i can check if an website has Leverage browser caching enabled or not and if enabled then for how much time
  example an css file link like <code>http://foo.com/foo.css</code> or an image link <code>http://foo.com/foo.img</code>
  now how to know if Leverage browser caching is enabled in them and its configuration.</p>