code: def validate(self, request, data):
          
          client = consumer.Consumer(request.session, None)
  
          try:
              resp = client.complete(data, request.session['openid_return_to'])
          except KeyError:
              messages.error(request, lang.INVALID_RESPONSE_FROM_OPENID)
              return redirect('netauth-login')
          if resp.status == consumer.CANCEL:
              messages.warning(request, lang.OPENID_CANCELED)
              return redirect('netauth-login')
          elif resp.status == consumer.FAILURE:
              messages.error(request, lang.OPENID_FAILED % resp.message)
              return redirect('netauth-login')
          elif resp.status == consumer.SUCCESS:
              self.identity = resp.identity_url
              del request.session['openid_return_to']
              return resp
docs: Validate response from OpenID server.
          Set identity in case of successfull validation.