curl_cffi

Python binding for curl-impersonate via CFFI.

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

Note on Chrome 110+ JA3 fingerprints

Chrome introduces ClientHello permutation in version 110, which means the order of extensions will be random, thus JA3 fingerprints will be random. So, when comparing JA3 fingerprints of curl_cffi and a browser, they may differ. However, this does not mean that TLS fingerprints will not be a problem, ClientHello extension order is just one factor of how servers can tell automated requests from browsers.

See more from this article and curl-impersonate notes

Install

pip install --upgrade curl_cffi

This should work for Linux(x86_64/aarch64), macOS(Intel/Apple Silicon), Windows(amd64). If it does not work, you may need to compile and install curl-impersonate first.

Usage

requests/httpx-like API:

from curl_cffi import requests

# Notice the impersonate parameter
r = requests.get("https://tls.browserleaks.com/json", impersonate="chrome101")

print(r.json())
# output: {'ja3_hash': '53ff64ddf993ca882b70e1c82af5da49'
# the fingerprint should be the same as target browser

# proxies are supported
proxies = {"https": "http://localhost:3128"}
r = requests.get("https://tls.browserleaks.com/json", impersonate="chrome101", proxies=proxies)

# socks proxies are also supported
proxies = {"https": "socks://localhost:3128"}
r = requests.get("https://tls.browserleaks.com/json", impersonate="chrome101", proxies=proxies)

Sessions

# sessions are supported
s = requests.Session()
# httpbin is a http test website
s.get("https://httpbin.org/cookies/set/foo/bar")
print(s.cookies)
# <Cookies[<Cookie foo=bar for httpbin.org />]>
r = s.get("https://httpbin.org/cookies")
print(r.json())
# {'cookies': {'foo': 'bar'}}

Supported impersonate versions:

• chrome99
• chrome100
• chrome101
• chrome104
• chrome107
• chrome110
• chrome99_android
• edge99
• edge101
• safari15_3
• safari15_5

Alternatively, you can use the low-level curl-like API:

from curl_cffi import Curl, CurlOpt
from io import BytesIO

buffer = BytesIO()
c = Curl()
c.setopt(CurlOpt.URL, b'https://tls.browserleaks.com/json')
c.setopt(CurlOpt.WRITEDATA, buffer)

c.impersonate("chrome101")

c.perform()
c.close()
body = buffer.getvalue()
print(body.decode())

See example.py or tests/ for more examples.

API

Requests: almost the same as requests.

Curl object:

• setopt(CurlOpt, value): Sets curl options as in curl_easy_setopt
• perform(): Performs curl request, as in curl_easy_perform
• getinfo(CurlInfo): Gets information in response after curl perform, as in curl_easy_getinfo
• close(): Closes and cleans up the curl object, as in curl_easy_cleanup

Enum values to be used with setopt and getinfo, and can be accessed from CurlOpt and CurlInfo.

Trouble Shooting

Pyinstaller ModuleNotFoundError: No module named '_cffi_backend'

You need to tell pyinstaller to pack cffi and data files inside the package:

pyinstaller -F .\example.py --hidden-import=_cffi_backend --collect-all curl_cffi

Using https proxy, error: OPENSSL_internal:WRONG_VERSION_NUMBER

You are messing up https-over-http proxy and https-over-https proxy, for most cases, you should change {"https": "https://localhost:3128"} to {"https": "http://localhost:3128"}. Note the protocol in the url for https proxy is http not https.

See this issue for a detailed explaination.

Current Status

This implementation is very hacky now, but it works for most common systems.

When people installing other python curl bindings, like pycurl, they often face compiling issues or OpenSSL issues, so I really hope that this package can be distributed as a compiled binary package, uses would be able to use it by a simple pip install, no more compile errors.

For now, I just download the pre-compiled libcurl-impersonate from github and build a bdist wheel, which is a binary package format used by PyPI, and upload it. However, the right way is to download curl and curl-impersonate sources on our side and compile them all together.

Help wanted!

TODOs:

• Write docs.
• Binary package for macOS(Intel/AppleSilicon) and Windows.
• Support musllinux(alpine) bdist by building from source.
• Exclude the curl headers from source, download them when building.
• Update curl header files and constants via scripts.
• Implement requests.Session/httpx.Client.
• Create ABI3 wheels to reduce package size and build time.
• Set default headers as in curl-impersonate wrapper scripts.
• Support stream in asyncio mode

Change Log

• 0.5.0

  • Added asyncio support

• 0.4.0

  • Removed c shim callback function, use cffi native callback function

• 0.3.6

  • Updated to curl-impersonate v0.5.4, supported chrome107 and chrome110

• 0.3.0, copied more code from httpx to support session

  • Add requests.Session
  • Breaking change: Response.cookies changed from http.cookies.SimpleCookie to curl_cffi.requests.Cookies
  • Using ABI3 wheels to reduce package size.

Acknowledgement

• This package was originally forked from https://github.com/multippt/python_curl_cffi , which is under the MIT license.
• headers/cookies files are copied from https://github.com/encode/httpx/blob/master/httpx/_models.py , which is under the BSD license.
• Asyncio support is inspired by Tornado's curl http client.