Code

Value	Description
CLOSE_CODE_BAD_PAYLOAD	The endpoint is terminating the connection because a message was received that contained inconsistent data (e.g., non-UTF-8 data within a text message).
CLOSE_CODE_GOING_AWAY	The endpoint is going away, either because of a server failure or because the browser is navigating away from the page that opened the connection.
CLOSE_CODE_INTERNAL_ERROR	The server is terminating the connection because it encountered an unexpected condition that prevented it from fulfilling the request.
CLOSE_CODE_NEEDS_EXTENSION	The client is terminating the connection because it expected the server to negotiate one or more extension, but the server didn't.
CLOSE_CODE_NORMAL	Normal closure; the connection successfully completed whatever purpose for which it was created.
CLOSE_CODE_POLICY_ERROR	The endpoint is terminating the connection because it received a message that violates its policy. This is a generic status code, used when codes 1003 and 1009 are not suitable.
CLOSE_CODE_PROTOCOL_ERROR	The endpoint is terminating the connection due to a protocol error.
CLOSE_CODE_SERVICE_RESTART	The server is terminating the connection because it is restarting.
CLOSE_CODE_TOO_BIG	The endpoint is terminating the connection because a data frame was received that is too large.
CLOSE_CODE_TRY_AGAIN_LATER	The server is terminating the connection due to a temporary condition, e.g. it is overloaded and is casting off some of its clients.
CLOSE_CODE_UNKNOWN_DATA	The connection is being terminated because the endpoint received data of a type it cannot accept (for example, a text-only endpoint received binary data).

Asynchronously close WebSocket connection by transmitting a close code.

WebSocket Object  | WebSocket Members