If there's no SockJsCookieNeeded or SockJsNoCookieNeeded annotation, the cookie config is taken from sockJsCookie in xitrum.conf.
See SockJsCookieNeeded.
WebSocket is always turn on for SockJS.
See: https://github.com/swagger-api/swagger-spec/blob/master/versions/2.0.md
WebSocket is always turn on for SockJS. To turn off, use this annotation.