def start_requests(self):
    headers = {'User-Agent':
        'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36'
        }
for i, url in enumerate(self.start_urls):
    yield Request(url, cookies={'over18': '1'}, callback=self.parse_item,
        headers=headers)
How to send cookie with scrapy CrawlSpider requests?