code: def post(self):
      
      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))
docs: Handle post request.