505 HTTP Version Not Supported
The server does not support this HTTP version.
What it means
The protocol version in the request line is not supported.
What your client should do
Use HTTP/1.1 or a version the server lists.
Should you retry?
Only after you change the request.
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/505 from Endpoint Client and open the Explain tab.
Defined in RFC 9110. All status codes and headers