title: is it possible to send a data when a websocket connection is opened
body: <p>I am implementing a Jetty Websocket servlet. 
  When the server receives a new connection, I want to send a message that will be read by websocket's onopen function. I want this message to be sent only during the open and not using the regular connection.SendMessage() function. Is it possible to do that? and how?</p>