text: var http = require("http");
  var io = require("socket.io")(http);
  
  app.get("/", function(req, res) {
    res.sendFile(__dirname + "/index.html");
  });
  
  io.on("connection", function(socket) {
    console.log("a user connected");
  });
  
  http.listen(3000, function() {
    console.log("listening on *:3000");
  });
  