title: Websocket getting remote IP on connect
body: <p>Can I get remote IP address inside <code>@OnOpen</code> method of <code>@ServletEndpoint</code> class?
  I tried follow this <a href="https://stackoverflow.com/questions/17936440/accessing-httpsession-from-httpservletrequest-in-a-web-socket-socketendpoint">Accessing HttpSession from HttpServletRequest in a Web Socket @SocketEndpoint</a> but as in <a href="https://stackoverflow.com/questions/20240591/websocket-httpsession-returns-null">Websocket - httpSession returns null</a> it doesn't work. </p>
  
  <p>Anyway I only need clients IP address.</p>