title: Selenium: get Last-Modified HTTP header?
body: <p>Is it possible to check whether a page is old (in that case this page will be skipped by the test) by evaluating the If-Modified-Since HTTP header property of a page?</p>
  
  <p>Is it possible to check this before the page is completely loaded, therefore saving some bandwith and time?</p>
  
  <p>I am using <code>RemoteWebDriver()</code></p>