xtekky/gpt4free · error · MissingRequirementsError

Install "curl_cffi" package | pip install -U curl_cffi

Error message

Install "curl_cffi" package | pip install -U curl_cffi

What it means

MissingRequirementsError raised by the stub Session class in g4f/requests/__init__.py when curl_cffi is not installed: importing g4f.requests works, but any Session(...) construction fails immediately. curl_cffi is the TLS-impersonation HTTP client most browser-based providers depend on, so without it nearly all cookie/Cloudflare-dependent providers cannot run.

Source

Thrown at g4f/requests/__init__.py:67

try:
    from .cdp import CDPSession

    has_cdp = True
except ImportError:
    has_cdp = False

from .. import debug
from .raise_for_status import raise_for_status
from ..errors import MissingRequirementsError
from ..typing import Cookies
from ..cookies import BrowserConfig, get_cookies_dir
from .defaults import DEFAULT_HEADERS, WEBVIEW_HAEDERS

if not has_curl_cffi:

    class Session:
        def __init__(self, **kwargs):
            raise MissingRequirementsError(
                'Install "curl_cffi" package | pip install -U curl_cffi'
            )


async def get_args_from_webview(url: str) -> dict:
    if not has_webview:
        raise MissingRequirementsError('Install "webview" package')
    window = webview.create_window("", url, hidden=True)
    await asyncio.sleep(2)
    body = None
    while body is None:
        try:
            await asyncio.sleep(1)
            body = window.dom.get_element("body:not(.no-js)")
        except Exception:
            ...
    headers = {
        **WEBVIEW_HAEDERS,

View on GitHub (pinned to 973504e177)

Solutions

1. Install the dependency exactly as the message says: pip install -U curl_cffi.
2. Better, install g4f with its requirements: pip install -U g4f[all] (or the relevant extras) so all optional deps come along.
3. In Dockerfiles, ensure the base image is new enough for curl_cffi's binary wheels, or upgrade pip first.
4. Verify with python -c "import curl_cffi; print(curl_cffi.__version__)" before running your app.

Example fix

# before
pip install g4f
python app.py  # MissingRequirementsError: Install "curl_cffi" package

# after
pip install -U g4f[all]
python app.py

import importlib.util
if importlib.util.find_spec('curl_cffi') is None:
    raise RuntimeError('curl_cffi not installed — run: pip install -U curl_cffi')

def has_curl_cffi() -> bool:
    import importlib.util
    return importlib.util.find_spec('curl_cffi') is not None

from g4f.errors import MissingRequirementsError
try:
    session = Session(impersonate='chrome')
except MissingRequirementsError as e:
    raise RuntimeError(f'deployment incomplete: {e}') from e

When it happens

Trigger: pip install g4f without extras (curl_cffi is an optional dependency), then any code path constructing g4f.requests.Session — directly or via a provider that uses it for browser-fingerprinted requests.

Common situations: Minimal installs in CI or slim Docker images; installing g4f from source without requirements; virtualenvs where curl_cffi failed to build (it ships binary wheels — old pip/platform combos can miss them).

Related errors

• Install "beautifulsoup4" package
• Install "webview" package
• cloudscraper library is required for Yupp provider | install
• MarkItDown is not installed. Please install it with `pip ins
• Install "gpt4all" package | pip install -U g4f[local]

AI-assisted analysis of xtekky/gpt4free@973504e177 (2026-08-14). Data as JSON: /api/errors/59721f01372c3cba. Report an issue: GitHub.