title: How to efficiently test accessing a large file with Behat/Mink?
body: <p>I'd like to write Behat/Mink scenarios to check whether certain user accounts can download a large file.  I can use the <code>When I follow "largefile.zip"</code> event, but that appears to download the entire file.</p>
  
  <p>Rather than wasting time and resources streaming the large file, I'd like to (for example) just check the result of an HTTP <code>HEAD</code> request, or just try to start downloading the file with an HTTP <code>GET</code> request and then cancel it immediately and check <code>the response status code</code>.</p>
  
  <p>How can I do that with Behat/Mink?</p>