code: def create_app_cookie_stickiness_policy(self, name, lb_name, policy_name):
          
          params = {
                      'CookieName'        :   name,
                      'LoadBalancerName'  :   lb_name,
                      'PolicyName'        :   policy_name,
                   }
          return self.get_status('CreateAppCookieStickinessPolicy', params)
docs: Generates a stickiness policy with sticky session lifetimes that follow
          that of an application-generated cookie. This policy can only be
          associated with HTTP listeners.
  
          This policy is similar to the policy created by
          CreateLBCookieStickinessPolicy, except that the lifetime of the special
          Elastic Load Balancing cookie follows the lifetime of the
          application-generated cookie specified in the policy configuration. The
          load balancer only inserts a new stickiness cookie when the application
          response includes a new application cookie.
  
          If the application cookie is explicitly removed or expires, the session
          stops being sticky until a new application cookie is issued.