SocketStream - Detect when client disconnect from server side

Is there a way to detect when a client disconnect from the server side?

app.js

ss.event.on("close",function(session){

console.log(client disconnected); });

thanks

Check these two:

req.on("close", function() {
  // request closed unexpectedly
});

req.on("end", function() {
  // request ended normally
}):