postman pre-request script (post form-data)

pm.sendRequest({
    url: '{{your url}}',
    method: 'POST',
    header: {
        'Content-Type': 'multipart/form-data',
          },
    body: {
      mode: 'formdata',
      formdata: [
        {key: "{{your key}}", value: "{{your value}}", disabled: false, description: {content:"", type:"text/plain"}},
        {key: "{{your key}}", value: "{{your value}}", disabled: false, description: {content:"", type:"text/plain"}},
        {key: "{{your key}}", value: "{{your value}}", disabled: false, description: {content:"", type:"text/plain"}}
      ]
    }
  }, function(err, response) { 
  //сохраняем парметр set-cookie в переменную
      var refresh = response.headers.get('set-cookie');
  //обрезаем для получения куки
      refresh = refresh.substr(2,36);
  //сохраняем в переменную окружения
       pm.environment.set("{{your value}}", refresh);
       
  });