scrapy爬虫返回302，301，解决方法

def demo():

    headers = {'Accept':'xxxx',
           'Accept-Encoding':'xxxx',
           'Accept-Language':'xxxx',
           'Connection':'xxxx',
           'Host':'xxxx',
           'Upgrade-Insecure-Requests':'x',
           'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'}

    url = 'https:xxxxx.com'
    html = requests.get(url, headers=headers, allow_redirects=False)
    return html.headers['Location']
def demo():

    headers = {'Accept':'xxxx'