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 requestsheaders = {'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 requestsheaders = {'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 AsyncSessionheaders = {'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
