static CloseWebSocketFrame ofClose(WebSocketCloseStatus status, String reason) {
        requireNonNull(status, "status");
        requireNonNull(reason, "reason");
        return new CloseByteBufWebSocketFrame(status, reason);
    }
Returns a new {@link CloseWebSocketFrame} with the {@link WebSocketCloseStatus} and the reason.

@see <a href="https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.1">Close</a>
core/src/main/java/com/linecorp/armeria/common/websocket/WebSocketFrame.java