title: Are client side certificates supported in App Engine
body: <p>I am developing a google app engine application, and I need to connect to a webservice using SOAP. I'm using pysimplesoap (patched with the code found <a href="http://code.google.com/p/pysimplesoap/issues/detail?id=45" rel="nofollow">here</a>) to parse the xml, and fire a request with a client-side certificate. 
  When I do this in a simple unit test from my local environment, it works, and I get a proper response from the webservice. 
  However, when I run the exact same code from within app engine, I get this:</p>
  
  <pre><code>  File "/Users/me/Documents/workspace/blixem/model/communicate/communication_channel.py", line 60, in generate_soap_message_pysimplesoap
      response = client.SendDocument('LA.XML', 'TESTCASE', 'data')
    File "/Users/me/Documents/workspace/blixem/lib/pysimplesoap/client.py", line 152, in &lt;lambda&gt;
      return lambda *args, **kwargs: self.wsdl_call(attr,*args,**kwargs)
    File "/Users/me/Documents/workspace/blixem/lib/pysimplesoap/client.py", line 320, in wsdl_call
      response = self.call(method, *params)
    File "/Users/me/Documents/workspace/blixem/lib/pysimplesoap/client.py", line 215, in call
      self.xml_response = self.send(method, self.xml_request)
    File "/Users/me/Documents/workspace/blixem/lib/pysimplesoap/client.py", line 241, in send
      location,"POST", body=xml, headers=headers )
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/httplib2/httplib2/__init__.py", line 1457, in request
      self.disable_ssl_certificate_validation)
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/httplib2/httplib2/__init__.py", line 1143, in __init__
      strict, timeout, proxy_info, ca_certs, disable_ssl_certificate_validation)
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/httplib2/httplib2/__init__.py", line 1092, in __init__
      raise NotSupportedOnThisPlatform()
  NotSupportedOnThisPlatform
  </code></pre>
  
  <p>I did some reading, and discovered that client side certificates were not supported yet in the urlfetch service. Is this still the case? If so, is there a work-around? </p>