https://scrapingclub.com/exercise/detail_cookie/

    def parse(self, response):

        pattern=re.compile('token=(.*?);')
        token=pattern.findall( response.headers.get("set-cookie").decode("utf-8"))[0]
        cookie = {
            '__cfduid': 'd67f5270ed84c0000af9c771fdee950631551004073',
            '_ga': 'GA1.2.2009295084.1551004056',
            '_gid': 'GA1.2.513859849.1551004056',
            'token': token
        }
        yield scrapy.Request(url='https://scrapingclub.com/exercise/ajaxdetail_cookie/?token='+str(token),cookies=cookie,headers=header,callback=self.parse_json)

settings.py

COOKIES_ENABLED = True

DEFAULT_REQUEST_HEADERS = {
  # 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  # 'Accept-Language': 'en',
# 'cookie': '__cfduid=d67f5270ed84c0000af9c771fdee950631551004073; _ga=GA1.2.2009295084.1551004056; _gid=GA1.2.513859849.1551004056; token=685NVSGV2O',
# 'dnt': '1',
'referer': 'https://scrapingclub.com/exercise/detail_cookie/',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36',
'x-requested-with': 'XMLHttpRequest'
}