What causes "Install "curl_cffi" package | pip install -U curl_cffi" in xtekky/gpt4free?

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

Raised by HuggingChat.create_async_generator when the optional curl_cffi package is not installed. HuggingChat's Session wrapper depends on curl_cffi to present a browser-like TLS fingerprint to huggingface.co; without it the provider refuses to run rather than failing mid-request. It is a MissingRequirementsError, so it is purely an environment problem.

Source

Thrown at g4f/Provider/needs_auth/hf/HuggingChat.py:110

            yield AuthResult(
                cookies=cookies, headers=DEFAULT_HEADERS, impersonate="chrome"
            )

    @classmethod
    async def create_authed(
        cls,
        model: str,
        messages: Messages,
        auth_result: AuthResult,
        prompt: str = None,
        media: MediaListType = None,
        return_conversation: bool = True,
        conversation: Conversation = None,
        web_search: bool = False,
        **kwargs,
    ) -> AsyncResult:
        if not has_curl_cffi:
            raise MissingRequirementsError(
                'Install "curl_cffi" package | pip install -U curl_cffi'
            )
        model = cls.get_model(model)

        session = Session(**auth_result.get_dict())

        if conversation is None or not hasattr(conversation, "models"):
            conversation = Conversation({})

        if model not in conversation.models:
            conversationId = cls.create_conversation(session, model)
            debug.log(f"Conversation created: {json.dumps(conversationId[8:] + '...')}")
            messageId = cls.fetch_message_id(session, conversationId)
            conversation.models[model] = {
                "conversationId": conversationId,
                "messageId": messageId,
            }
            inputs = format_prompt(messages)

View on GitHub (pinned to 973504e177)

Solutions

Run: pip install -U curl_cffi
Verify with: python -c "import curl_cffi"
If you don't need HuggingChat, route requests to a provider without the curl_cffi dependency

Example fix

# before
# MissingRequirementsError: Install "curl_cffi" package
# after
pip install -U curl_cffi
python -c "from curl_cffi import requests; print('ok')"

Defensive patterns

Strategy: validation

Validate before calling

def huggingchat_ready() -> bool:
    try:
        import curl_cffi  # noqa: F401
        return True
    except ImportError:
        return False

if not huggingchat_ready():
    raise SystemExit("pip install -U curl_cffi")

Prevention

Add curl_cffi to requirements whenever HuggingChat is in your provider set
Run an import check at startup before selecting providers
Include provider extras in Docker builds: pip install g4f[all]

When it happens

Trigger: Instantiating/calling the HuggingChat provider (hf chat models) in an environment where `import curl_cffi` failed and has_curl_cffi is False.

Common situations: Minimal installs of g4f that skipped provider extras; Docker images trimmed for size; CI environments where only core requirements were pinned.

Related errors

AI-assisted analysis of xtekky/gpt4free@973504e177 (2026-08-14). Data as JSON: /api/errors/79a6dc655737103d. Report an issue: GitHub.