curl-cffi 0.10.0b1

libcurl ffi bindings for Python, with impersonation support.

curl_cffi

Documentation

Python binding for curl-impersonate fork via cffi.

Unlike other pure python http clients like httpx or requests, curl_cffi can impersonate browsers' TLS/JA3 and HTTP/2 fingerprints. If you are blocked by some website for no obvious reason, you can give curl_cffi a try.

Minimum supported python versions:

• Since 0.10, Python 3.9
• 0.9 and below, Python 3.8

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Features

• Supports JA3/TLS and http2 fingerprints impersonation, including recent browsers and custome fingerprints.
• Much faster than requests/httpx, on par with aiohttp/pycurl, see benchmarks.
• Mimics requests API, no need to learn another one.
• Pre-compiled, so you don't have to compile on your machine.
• Supports asyncio with proxy rotation on each request.
• Supports http 2.0, which requests does not.
• Supports websocket.

	requests	aiohttp	httpx	pycurl	curl_cffi
http2	❌	❌	✅	✅	✅
sync	✅	❌	✅	✅	✅
async	❌	✅	✅	❌	✅
websocket	❌	✅	❌	❌	✅
fingerprints	❌	❌	❌	❌	✅
speed	🐇	🐇🐇	🐇	🐇🐇	🐇🐇

Install

pip install curl_cffi --upgrade

This should work on Linux, macOS and Windows out of the box. If it does not work on you platform, you may need to compile and install curl-impersonate first and set some environment variables like LD_LIBRARY_PATH.

To install beta releases:

pip install curl_cffi --upgrade --pre

To install unstable version from GitHub:

git clone https://github.com/lexiforest/curl_cffi/
cd curl_cffi
make preprocess
pip install .

Usage

curl_cffi comes with a low-level curl API and a high-level requests-like API.

requests-like

from curl_cffi import requests

# Notice the impersonate parameter
r = requests.get("https://tools.scrapfly.io/api/fp/ja3", impersonate="chrome")

print(r.json())
# output: {..., "ja3n_hash": "aa56c057ad164ec4fdcb7a5a283be9fc", ...}
# the js3n fingerprint should be the same as target browser

# To keep using the latest browser version as `curl_cffi` updates,
# simply set impersonate="chrome" without specifying a version.
# Other similar values are: "safari" and "safari_ios"
r = requests.get("https://tools.scrapfly.io/api/fp/ja3", impersonate="chrome")

# To pin a specific version, use version numbers together.
r = requests.get("https://tools.scrapfly.io/api/fp/ja3", impersonate="chrome124")

# To impersonate other than browsers, bring your own ja3/akamai strings
# See examples directory for details.
r = requests.get("https://tls.browserleaks.com/json", ja3=..., akamai=...)

# http/socks proxies are supported
proxies = {"https": "http://localhost:3128"}
r = requests.get("https://tools.scrapfly.io/api/fp/ja3", impersonate="chrome", proxies=proxies)

proxies = {"https": "socks://localhost:3128"}
r = requests.get("https://tools.scrapfly.io/api/fp/ja3", impersonate="chrome", proxies=proxies)

Sessions

s = requests.Session()

# httpbin is a http test website, this endpoint makes the server set cookies
s.get("https://httpbin.org/cookies/set/foo/bar")
print(s.cookies)
# <Cookies[<Cookie foo=bar for httpbin.org />]>

# retrieve cookies again to verify
r = s.get("https://httpbin.org/cookies")
print(r.json())
# {'cookies': {'foo': 'bar'}}

curl_cffi supports the same browser versions as supported by my fork of curl-impersonate:

Browser versions will be added only when their fingerprints change. If you see a version, e.g. chrome122, were skipped, you can simply impersonate it with your own headers and the previous version.

If you are trying to impersonate a target other than a browser, use ja3=... and akamai=... to specify your own customized fingerprints. See the docs on impersonation for details.

• chrome99
• chrome100
• chrome101
• chrome104
• chrome107
• chrome110
• chrome116 ^[1]
• chrome119 ^[1]
• chrome120 ^[1]
• chrome123 ^[3]
• chrome124 ^[3]
• chrome131 ^[4]
• chrome133a ^[5][6]
• chrome99_android
• chrome131_android ^[4]
• edge99
• edge101
• safari15_3 ^[2]
• safari15_5 ^[2]
• safari17_0 ^[1]
• safari17_2_ios ^[1]
• safari18_0 ^[4]
• safari18_0_ios ^[4]
• firefox133 ^[5]
• firefox135 ^[7]

Notes:

1. Added in version 0.6.0.
2. Fixed in version 0.6.0, previous http2 fingerprints were not correct.
3. Added in version 0.7.0.
4. Added in version 0.8.0.
5. Added in version 0.9.0.
6. The version postfix -a(e.g. chrome133a) means that this is an alternative version, i.e. the fingerprint has not been officially updated by browser, but has been observed because of A/B testing.
7. Added in version 0.10.0.

asyncio

from curl_cffi.requests import AsyncSession

async with AsyncSession() as s:
    r = await s.get("https://example.com")

More concurrency:

import asyncio
from curl_cffi.requests import AsyncSession

urls = [
    "https://google.com/",
    "https://facebook.com/",
    "https://twitter.com/",
]

async with AsyncSession() as s:
    tasks = []
    for url in urls:
        task = s.get(url)
        tasks.append(task)
    results = await asyncio.gather(*tasks)

WebSockets

from curl_cffi.requests import WebSocket

def on_message(ws: WebSocket, message: str | bytes):
    print(message)

ws = WebSocket(on_message=on_message)
ws.run_forever("wss://api.gemini.com/v1/marketdata/BTCUSD")

For low-level APIs, Scrapy integration and other advanced topics, see the docs for more details.

asyncio WebSockets

import asyncio
from curl_cffi.requests import AsyncSession

async with AsyncSession() as s:
    ws = await s.ws_connect("wss://echo.websocket.org")
    await asyncio.gather(*[ws.send_str("Hello, World!") for _ in range(10)])
    async for message in ws:
        print(message)

Acknowledgement

• Originally forked from multippt/python_curl_cffi, which is under the MIT license.
• Headers/Cookies files are copied from httpx, which is under the BSD license.
• Asyncio support is inspired by Tornado's curl http client.
• The synchronous WebSocket API is inspired by websocket_client.
• The asynchronous WebSocket API is inspired by aiohttp.

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