Restify中接入Socket.io报Error:Can’t set headers的错误解决

var server = restify.createServer();
var io = socketio.listen(server);

// ...

io.sockets.on('connection', function (socket) {
 socket.emit('news', { hello: 'world' });
 socket.on('my other event', function (data) {
   console.log(data);
 });
});

Error: Can't set headers after they are sent.

var restify = require('restify');
var socketio = require('socket.io');

var server = restify.createServer();
var io = socketio.listen(server.server);

// ...

var io = socketio.listen(server.server);