title: Can we only get the web page header information and not the body? (Mechanize)
body: <p>What if I only need to download the page if it has not changed since the last download?
  What is the best way? can I get the size of the page first, then compare the decide if it has changed, if so, I ask for download else skip?</p>
  
  <p>I plan to use (python) mechanize.</p>