JA3 是一种创建 SSL/TLS 客户端指纹的方法，一般一个网站的证书是不变的，所以浏览器指纹也是稳定的，能区分不同的客户端。

requests库

Python requests库请求一个带JA3指纹网站的结果：

import requests

headers = {
    'authority': 'tls.browserleaks.com',
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7',
    'accept-language': 'zh-CN,zh;q=0.9,en;q=0.8,zh-TW;q=0.7,da;q=0.6',
    'cache-control': 'no-cache',
    'pragma': 'no-cache',
    'sec-ch-ua': '"Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"',
    'sec-ch-ua-mobile': '?0',
    'sec-ch-ua-platform': '"Windows"',
    'sec-fetch-dest': 'document',
    'sec-fetch-mode': 'navigate',
    'sec-fetch-site': 'cross-site',
    'sec-fetch-user': '?1',
    'upgrade-insecure-requests': '1',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36',
}

response = requests.get('https://tls.browserleaks.com/json', headers=headers)
print(response.json())

可以看到，akamai_hash和akamai_text都是空的。

curl_cffi实现JA3指纹

安装

首先安装curl_cffi：

pip install curl_cffi

impersonate

from curl_cffi import requests

headers = {
    'authority': 'tls.browserleaks.com',
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7',
    'accept-language': 'zh-CN,zh;q=0.9,en;q=0.8,zh-TW;q=0.7,da;q=0.6',
    'cache-control': 'no-cache',
    'pragma': 'no-cache',
    'sec-ch-ua': '"Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"',
    'sec-ch-ua-mobile': '?0',
    'sec-ch-ua-platform': '"Windows"',
    'sec-fetch-dest': 'document',
    'sec-fetch-mode': 'navigate',
    'sec-fetch-site': 'cross-site',
    'sec-fetch-user': '?1',
    'upgrade-insecure-requests': '1',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36',
}

response = requests.get('https://tls.browserleaks.com/json', headers=headers, impersonate="chrome110")
print(response.text)

这里需要通过from curl_cffi import requests引入requests，并在get方法里加入impersonate="chrome110"。

可以看到，akamai_hash和akamai_text都有值了。

支持异步和代理

import asyncio
from curl_cffi.requests import AsyncSession

headers = {
    'authority': 'tls.browserleaks.com',
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7',
    'accept-language': 'zh-CN,zh;q=0.9,en;q=0.8,zh-TW;q=0.7,da;q=0.6',
    'cache-control': 'no-cache',
    'pragma': 'no-cache',
    'sec-ch-ua': '"Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"',
    'sec-ch-ua-mobile': '?0',
    'sec-ch-ua-platform': '"Windows"',
    'sec-fetch-dest': 'document',
    'sec-fetch-mode': 'navigate',
    'sec-fetch-site': 'cross-site',
    'sec-fetch-user': '?1',
    'upgrade-insecure-requests': '1',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36',
}
urls = [
    "https://tls.browserleaks.com/json",
    "https://tls.peet.ws/",
    # "https://kawayiyi.com/tls",
]

proxies = {"http": "socks5://127.0.0.1:10808", "https": "socks5://127.0.0.1:10808"}

asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())


async def main():
    async with AsyncSession() as s:
        tasks = []
        for url in urls:
            task = s.get(url, headers=headers, impersonate="chrome110", proxies=proxies)
            tasks.append(task)
        results = await asyncio.gather(*tasks)
        print(results)


asyncio.run(main())

参考

https://tls.browserleaks.com/json
https://github.com/salesforce/ja3
https://github.com/yifeikong/curl_cffi
https://github.com/lwthiker/curl-impersonate