> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# UnauthorizedResponseError - Go SDK

> UnauthorizedResponseError type definition

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

Unauthorized - Authentication required or invalid credentials

## Fields

| Field                | Type                                                                                                           | Required             | Description                         | Example                                                    |
| -------------------- | -------------------------------------------------------------------------------------------------------------- | -------------------- | ----------------------------------- | ---------------------------------------------------------- |
| `Error`              | [components.UnauthorizedResponseErrorData](/client-sdks/go/api-reference/models/unauthorizedresponseerrordata) | :heavy\_check\_mark: | Error data for UnauthorizedResponse | `{"code": 401,"message": "Missing Authentication header"}` |
| `OpenrouterMetadata` | map\[string]`any`                                                                                              | :heavy\_minus\_sign: | N/A                                 |                                                            |
| `UserID`             | `*string`                                                                                                      | :heavy\_minus\_sign: | N/A                                 |                                                            |