> ## Documentation Index
> Fetch the complete documentation index at: https://www.quo.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# API response codes

> Quo uses standard HTTP response codes to indicate request status. 

## Response code categories

* 2xx: Success
* 4xx: Client-side errors
* 5xx: Server-side errors

<Info>
  Some 4xx errors include specific error codes for programmatic handling.
</Info>

## Common response codes

| Code  | Status               | Description                                                   |
| ----- | -------------------- | ------------------------------------------------------------- |
| `200` | OK                   | Request successful                                            |
| `201` | Created              | Resource successfully created                                 |
| `202` | Accepted             | Request accepted for processing                               |
| `204` | No Content           | Request successful, no content returned                       |
| `400` | Bad Request          | Invalid parameters                                            |
| `401` | Unauthorized         | Missing or invalid API key                                    |
| `403` | Forbidden            | Insufficient permissions or an account setting is not enabled |
| `404` | Not Found            | Resource doesn't exist                                        |
| `409` | Conflict             | Conflict with another request                                 |
| `422` | Unprocessable Entity | Request is well-formed but contains semantic errors           |
| `429` | Too Many Requests    | Rate limit exceeded                                           |
| `500` | Server Error         | Quo-side issue                                                |

<Tip>
  For 429 errors, implement exponential backoff in your requests.
</Tip>