python request获取真实302地址

HEADERS = {
    'accept-encoding': 'gzip, deflate, br',
    'accept-language': 'zh-CN,zh;q=0.9',
    'pragma': 'no-cache',
    'cache-control': 'no-cache',
    'upgrade-insecure-requests': '1',
    'user-agent': "Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1",
}

def get_real_address(url):
    if url.find('v.douyin.com') < 0:
        return url
    res = requests.get(url, headers=HEADERS, allow_redirects=False)
    return res.headers['Location'] if res.status_code == 302 else None