511 Network Authentication Required
You need to sign in to the network first.
What it means
Sent by captive portals, such as hotel or airport Wi-Fi, not by the API you called.
What your client should do
Open a browser and complete the network login.
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/511 from Endpoint Client and open the Explain tab.
Defined in RFC 6585. All status codes and headers