Node.js在WebSocket范围上表达标头

Question

I've got a node.js + express + socket.io app.

i want to save the request headers in the socket, to use later.

io.sockets.on('connection', function (socket) {

  socket.headers = {};

  app.get('*', function (req, res) {

    //fetch headers
    socket.headers.ua = req.headers['user-agent'];  

    res.sendfile(__dirname + '/index.html');

  });
  ....etc

but because i am in the app scope, socket isnt defined. I always get confused with the in and out scope. i cannot app.get() it, because if another browser connects, the app will be changed, right?

Answer 1

You're doing it wrong. Every socket has a handshake object with it which contains request headers, domain, host, date etc. If you still want to fetch headers information then do this:

io.sockets.on('connection', function(socket) {
  console.log(socket.handshake); //This would print handshake object in JSON format
  // to get req-header, do this
  socket.head = socket.handshake.headers['user-agent'];
});

And you can use this property later in some event like:

socket.on('EventName',function(data){
  console.log(socket.head);
});