Javascript WebSocket not connecting to Scala server - scala

Question

I am trying to implement a real-time game server in Scala, but I have a problem connecting to it with javascript's WebSocket. I tryed connecting with websocket.org/echo.html using either ws://localhost:8888, ws://127.0.0.1:8888 or ws://[my ip]:8888 .
Here's my server code, whch is pretty much the example from Akka's doc:
class MyServer(port: Int) extends Actor with ActorLogging{
var address: InetSocketAddress = new InetSocketAddress("", port)
var socketServer: ServerHandle = IOManager(context.system).listen(address)
override def receive = {
//Fired when the server is listening
case Listening(server, add) =>
log.info(s"The server is now listening on $add.")
//When a new client connect to the server...
case NewClient(server) =>
log.info("A new client just connected !")
server.accept()
//When a message is received by the server
case Read(socket, bytes) =>
log.info("The server just received some data.")
log.info(bytes.decodeString("US-ASCII"))
//When a connection with a client is closed
case Closed(socket, cause) =>
log.info(s"A client just disconnected : $cause")
}
}
object GemsApplication extends App{
println("Starting Gems application !")
val port = Option(System.getenv("PORT")).map(_.toInt).getOrElse(8888)
println(s"Selected port is $port.")
ActorSystem().actorOf(Props( new MyServer(port) ))
}
The odd thing is that I can connect to my server using Python sockets. Since they are may more low-level I'm guessing that I'll have to implement the handshake response to make it work with WebSocket, but shouldn't I see the message from the web socket asking for upgrade ? or even just connecting ?
Thanks for any insight you might have
Robin