title: Can't open url with requests and urllib2
body: <p>I try to access <code>https://www.collinsdictionary.com/browse/english/words-starting-with-a</code> with python <code>requests</code>, but get <code>requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("''",))</code>.</p>
  
  <p>I tried with <code>urllib2.urlopen</code>, but I got different html from what I see in browser (there is no <code>&lt;ul class="columns2 browse-list"&gt;</code>).</p>
  
  <p>What am I doing wrong?</p>