python普通程序访问网址状态码为521

问题遇到的现象和发生背景

无法通过js获取cookie，状态码为521

问题相关代码，请勿粘贴截图

import requests
import json
from fake_useragent import UserAgent


requests.packages.urllib3.disable_warnings()


import re
import execjs


url = "https://www.cnvd.org.cn/flaw/list?flag=true"


ua = UserAgent()
headers = {
    "User-Agent": ua.random
}



data = {
    "number": "20",
    "startDate": "",
    "endDate": "",
    "field": "",
    "order": "",
    "numPerPage": "10",
    "offset": "20",
    "max": "20",
    "startWord": "A"
}

response = requests.post(url, headers=headers, data=data)

print(response.text)
print(response)

我想要达到的结果

https://www.cnvd.org.cn/
破防护措施，python程序正常访问

通过js自动获取cookie并实现正常访问