BerriAI/litellm · error · ValueError

Reducto /upload returned a non-JSON 200 response: {response.

Error message

Reducto /upload returned a non-JSON 200 response: {response.text}

What it means

Response-shape guard after a Reducto /upload call: the HTTP status was 200 but response.json() raised, meaning the body is not JSON (unexpected gateway/content response), and the raw text is surfaced for diagnosis.

Source

Thrown at litellm/llms/reducto/common.py:69

        _raise_bad_request("Invalid Reducto data URI provided.", model=model)

    if ";base64" not in header:
        _raise_bad_request("Reducto only supports base64-encoded data URIs.", model=model)

    mime: Final = header.removeprefix("data:").split(";")[0] or "application/octet-stream"
    try:
        raw_bytes: Final = base64.b64decode(encoded, validate=True)
    except (binascii.Error, ValueError):
        _raise_bad_request("Invalid Reducto base64 payload provided.", model=model)

    return None, raw_bytes, mime


def _extract_file_id_from_upload_response(response: Any) -> str:
    try:
        payload: Final = response.json()
    except ValueError as exc:
        raise ValueError(f"Reducto /upload returned a non-JSON 200 response: {response.text}") from exc
    file_id: Final = (payload or {}).get("file_id") if isinstance(payload, dict) else None
    if not isinstance(file_id, str) or not file_id:
        raise ValueError(f"Reducto /upload returned 200 without a file_id; got payload={payload}")
    return file_id


def upload_bytes_sync(
    raw_bytes: bytes,
    mime: str | None,
    api_key: str,
    api_base: str | None,
) -> str:
    import litellm

    response: Final = litellm.module_level_client.post(
        url="{}{}".format(_normalize_api_base(api_base), "/upload"),
        headers={"Authorization": f"Bearer {api_key}"},
        files={"file": ("document", raw_bytes, mime or "application/octet-stream")},

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. The Reducto /upload endpoint returned non-JSON content; check api_base and proxy configuration.
2. Verify the Reducto server version and that the upload endpoint is correct.

Example fix

# curl the /upload endpoint manually and inspect the raw body.

When it happens

Trigger: Triggered when the Reducto /upload endpoint returns HTTP 200 with a body that is not valid JSON.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/41ec2222c3b7822d. Report an issue: GitHub.