title: Using certificates in urllib3
body: <p>I'm a Python newbie. I'm using urllib3 to talk to an api. The reason I'm using this and not requests is that I'd like to host my app on GAE. My app uses certicates. When I post data, I get the following error: </p>
  
  <pre><code>TypeError: __init__() got an unexpected keyword argument 'cert_reqs'
  </code></pre>
  
  <p>How can I include certs in my urlopen call? A snippet of code follows</p>
  
  <pre><code>CA_CERTS = ('client-2048.crt', 'client-2048.key')
  
  http = urllib3.PoolManager()
  r = http.urlopen('POST', url, body=payload, headers={'X-Application': '???', 'Content-Type': 'application/x-www-form-urlencoded'}, cert_reqs='REQUIRED', ca_certs=CA_CERTS)
  print r.status, r.data
  </code></pre>