URLSessionWebSocketTask.CloseCode.mandatoryExtensionMissing
A code that indicates the client terminated the connection because the server didn’t negotiate a required extension.
Declaration
case mandatoryExtensionMissingDiscussion
RFC 6455 indicates the client should provide a closeReason with a list of the needed extensions.
See Also
Close codes
URLSessionWebSocketTask.CloseCode.abnormalClosureURLSessionWebSocketTask.CloseCode.goingAwayURLSessionWebSocketTask.CloseCode.internalServerErrorURLSessionWebSocketTask.CloseCode.invalidURLSessionWebSocketTask.CloseCode.invalidFramePayloadDataURLSessionWebSocketTask.CloseCode.messageTooBigURLSessionWebSocketTask.CloseCode.noStatusReceivedURLSessionWebSocketTask.CloseCode.normalClosureURLSessionWebSocketTask.CloseCode.policyViolationURLSessionWebSocketTask.CloseCode.protocolErrorURLSessionWebSocketTask.CloseCode.tlsHandshakeFailureURLSessionWebSocketTask.CloseCode.unsupportedData