> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# UnauthorizedResponseError - Python SDK

> UnauthorizedResponseError error handling

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

Unauthorized - Authentication required or invalid credentials

## Fields

| Field                 | Type                                                                                                                   | Required             | Description                         | Example                                                    |
| --------------------- | ---------------------------------------------------------------------------------------------------------------------- | -------------------- | ----------------------------------- | ---------------------------------------------------------- |
| `error`               | [components.UnauthorizedResponseErrorData](/client-sdks/python/api-reference/components/unauthorizedresponseerrordata) | :heavy\_check\_mark: | Error data for UnauthorizedResponse | `{"code": 401,"message": "Missing Authentication header"}` |
| `openrouter_metadata` | Dict\[str, *Nullable\[Any]*]                                                                                           | :heavy\_minus\_sign: | N/A                                 |                                                            |
| `user_id`             | *OptionalNullable\[str]*                                                                                               | :heavy\_minus\_sign: | N/A                                 |                                                            |