Socket.io не работает

// start the server if `$ node server.js`
 if (require.main === module)
 app.io = require('socket.io')(app.start());
});

//log a user in
 app.post('/login', function(req, res) {
   User.login({
     email: req.body.email,
     password: req.body.password
   }, 'user', function(err, token) {
     if (err) {
       if(err.details && err.code === 'LOGIN_FAILED_EMAIL_NOT_VERIFIED'){
         res.render('reponseToTriggerEmail', {
           title: 'Login failed',
           content: err,
           redirectToEmail: '/api/users/'+ err.details.userId + '/verify',
           redirectTo: '/',
           redirectToLinkText: 'Click here',
           userId: err.details.userId
         });
       } else {
           app.io.emit('login-response', { loginError: 'Login failed. Wrong username or password'});
       }
       return;
     }
     res.render('home', {
       email: req.body.email,
       accessToken: token.id,
       redirectUrl: '/api/users/change-password?access_token=' + token.id
     });
   });
 });

server {
    listen  443 ssl http2;

    server_name ...;
    ssl_certificate ...;
    ssl_certificate_key ...;

    error_log /var/log/nginx/..;
    access_log /var/log/nginx/...;

    location / {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $host;

    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";


    proxy_pass http://...:3000/;
    }
}

<script src=js/jquery.min.js></script>
<script src=js/socket.io.js></script>
<script>
var socket = io.connect();
socket.on('login-response', function (msg) {
   console.log(msg);
   $('#login-response').html(msg.loginError)
});
</script>