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

Some 4xx errors include specific error codes for programmatic handling.

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

For 429 errors, implement exponential backoff in your requests.