code: def process_response(self, request, response, resource, req_succeeded):
          
          sid = request.cookies.get(self.cookie_name, None)
          if sid is None or not self.store.exists(sid):
              sid = self.generate_sid()
  
          self.store.set(sid, request.context.get(self.context_name, {}))
          response.set_cookie(self.cookie_name, sid, expires=self.cookie_expires, max_age=self.cookie_max_age,
                              domain=self.cookie_domain, path=self.cookie_path, secure=self.cookie_secure,
                              http_only=self.cookie_http_only)
docs: Save request context in coupled store object. Set cookie containing a session ID.