def post(self):
    """Handle post request."""
    client_customer_id = self.request.get('clientCustomerId')
    campaign_id = self.request.get('campaignId')
    if not client_customer_id or not campaign_id:
      self.redirect('/')
    else:
      self.redirect('/showAdGroups?clientCustomerId=%s&campaignId=%s'
                    % (client_customer_id, campaign_id))
Handle post request.