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).

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.

The server is terminating the connection because it encountered an unexpected condition that prevented it from fulfilling the request.

The client is terminating the connection because it expected the server to negotiate one or more extension, but the server didn't.

Normal closure; the connection successfully completed whatever purpose for which it was created.

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.

The endpoint is terminating the connection due to a protocol error.

The server is terminating the connection because it is restarting.

The endpoint is terminating the connection because a data frame was received that is too large.

The server is terminating the connection due to a temporary condition, e.g. it is overloaded and is casting off some of its clients.

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).