HKUDS/nanobot · error · ImageGenerationError

generated image URL did not return a supported image

Error message

generated image URL did not return a supported image

What it means

Error "generated image URL did not return a supported image" thrown in HKUDS/nanobot.

Source

Thrown at nanobot/providers/image_generation.py:232

                    async for chunk in response.aiter_bytes():
                        total += len(chunk)
                        if total > _IMAGE_DOWNLOAD_MAX_BYTES:
                            raise ImageGenerationError(
                                "generated image exceeded the 32 MiB download limit"
                            )
                        chunks.append(chunk)
                    raw = b"".join(chunks)
                    break
            else:
                raise ImageGenerationError("generated image URL exceeded the redirect limit")
    except UnsafeURLRequestError as exc:
        raise ImageGenerationError(f"blocked unsafe generated image URL: {exc}") from exc
    except httpx.RequestError as exc:
        raise ImageGenerationError(f"failed to download generated image: {exc}") from exc

    mime = detect_image_mime(raw)
    if mime is None:
        raise ImageGenerationError("generated image URL did not return a supported image")
    encoded = base64.b64encode(raw).decode("ascii")
    return f"data:{mime};base64,{encoded}"


# ---------------------------------------------------------------------------
# Registry
# ---------------------------------------------------------------------------

_IMAGE_GEN_PROVIDERS: dict[str, type[ImageGenerationProvider]] = {}


def register_image_gen_provider(cls: type[ImageGenerationProvider]) -> None:
    """Register an image provider at import time only.

    The registry is populated by module side effects so provider discovery
    stays lazy and consistent across the process.
    """
    name = cls.provider_name

View on GitHub (pinned to 42f37dc4c0)

When it happens

Trigger: Thrown at nanobot/providers/image_generation.py:232 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of HKUDS/nanobot@42f37dc4c0 (2026-08-26). Data as JSON: /api/errors/316a3190f36a16f8. Report an issue: GitHub.