510 Not Extended
Further extensions to the request are required.
What it means
Obsolete and historic.
What your client should do
Check the API documentation.
Should you retry?
No. Repeating the same request will give the same result.
Try it
The free practice API returns this status on demand, with the headers a well-behaved API would send. Call GET /api/play/status/510 from Endpoint Client and open the Explain tab.
Defined in RFC 2774. All status codes and headers