title: Requests body empty
body: <p>Why does the following print None?</p>
  
  <pre><code>import requests
  r = requests.request('http://cnn.com', data={"foo":"bar"})
  print r.request.body
  # None
  </code></pre>
  
  <p>If you change cnn.com to www.cnn.com, it prints the proper body. I noticed a redirect (there is a 301 in r.history). What's going on?</p>