Skip to main content
HTTP 501 Not Implemented
The server does not support the functionality required to fulfil the request.
5xx · Server error✗ not retryable — fix the request instead
Fix checklist
- Check you're calling a released endpoint, not a docs-preview one.
- Verify the HTTP method.
Spec: RFC reference
Related status codes
500 Internal Server Error
The server hit an unexpected condition.
502 Bad GatewayA gateway or proxy received an invalid response from the upstream server..
503 Service UnavailableThe server is temporarily unable to handle the request — overload or maintenance.
504 Gateway TimeoutA gateway did not receive a timely response from the upstream server..