xtekky/gpt4free · error · RuntimeError

Failed to start conversation: {await resp.text()}

Error message

Failed to start conversation: {await resp.text()}

What it means

CopilotApp POSTs to https://copilot.microsoft.com/c/api/start to create a conversation; any non-200 status raises with the response body attached. Common statuses: 401/403 (session not established), 429 (too many live sessions — the class tracks a 'live' counter), or 4xx from missing/invalid headers.

Source

Thrown at g4f/Provider/CopilotApp.py:67

        }

        start_payload = {
            "timeZone": "Europe/Kiev",
            "startNewConversation": True,
            "teenSupportEnabled": True,
            "correctPersonalizationSetting": True,
            "deferredDataUseCapable": True,
        }
        try:
            async with aiohttp.ClientSession() as session:
                async with session.post(
                    "https://copilot.microsoft.com/c/api/start",
                    headers=headers,
                    json=start_payload,
                    proxy=proxy,
                ) as resp:
                    if resp.status != 200:
                        raise RuntimeError(
                            f"Failed to start conversation: {await resp.text()}"
                        )

                    start_data = await resp.json()
                    conversation_id = start_data.get("currentConversationId")

                client_session_id = str(uuid.uuid4())
                ws_url = f"wss://copilot.microsoft.com/c/api/chat?api-version=2&clientSessionId={client_session_id}"

                async with session.ws_connect(ws_url, headers=headers, proxy=proxy) as ws:
                    async for msg in ws:
                        if msg.type == aiohttp.WSMsgType.TEXT:
                            data = json.loads(msg.data)
                            if data.get("event") == "connected":
                                break

                    model_lower = model.lower()
                    if (

View on GitHub (pinned to 973504e177)

Solutions

1. Read the status/body in the message: 401/403 → refresh auth cookies; 429 → back off and limit concurrency
2. Ensure session-establishing cookies are included in the headers passed to create_async_generator
3. Serialize or cap concurrent CopilotApp conversations to avoid session-limit rejections

try:
    async for chunk in CopilotApp.create_async_generator(model, messages):
        yield chunk
except RuntimeError as e:
    text = str(e)
    if '429' in text:
        await asyncio.sleep(30)  # session limit: back off
        async for chunk in CopilotApp.create_async_generator(model, messages):
            yield chunk
    elif '401' in text or '403' in text:
        raise AuthNeeded('CopilotApp session rejected — refresh cookies')
    else:
        raise

When it happens

Trigger: Calling /c/api/start without valid session cookies; exceeding the provider's concurrent-session expectations (cls.live); request blocked by bot detection; malformed start_payload after an upstream schema change.

Common situations: Auth cookie not passed in headers; running many parallel CopilotApp requests from one IP; Microsoft requiring additional headers/turnstile token; proxy stripping cookies.

Related errors

• Error: {msg}
• WebSocket Error: {ws.exception()}
• Error during CopilotApp interaction: {e}
• Invalid response: {last_msg}
• Failed to upload file: {response.status} {error_text}

AI-assisted analysis of xtekky/gpt4free@973504e177 (2026-08-14). Data as JSON: /api/errors/adec325b7643e16b. Report an issue: GitHub.