Express Js/AngularJS cookie session lost

I'm new to express and I'm trying to save some data in session and then retrieve it in another query. My client app is an AngularJS app.

    var express = require('express');
    var path = require('path');
    var favicon = require('serve-favicon');
    var logger = require('morgan');
    var cookieParser = require('cookie-parser');
    var bodyParser = require('body-parser');
    var cookieSession = require('cookie-session');
    app.use(cookieParser());
    app.use(cookieSession({
      name: 'session',
      keys: ['mySecret']
    }));
    app.use(bodyParser.json());

When retrieving session, it's always an empty object

{} What can be the cause ? Thank you !

EDIT

This my app.js now

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
//var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var cookieSession = require('cookie-session');
var methodOverride = require('method-override');

var session = require('express-session');

//Services
var routes = require('./routes/index');
var users = require('./routes/users');
var typesOperateurs = require('./routes/typesOperateurs');
var domains = require('./routes/domains');
var categories = require('./routes/categories');
var donnees = require('./routes/donnees');
var arcepData = require('./routes/arcepData');
var generalData = require('./routes/generalData');

var app = express();

var properties = require('./configs/properties');
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
//app.use(cookieParser('arcepSecret'));
/*app.use(cookieSession({
      name: 'session',
      keys: ['arcepSecret'],
          httpOnly : false
    }));*/
app.use(session({
    secret:'arcepSecret',
    resave: true,
    saveUninitialized: true,
    name : 'arcep.sid'
}));
app.use(bodyParser.json());
app.use(function (req, res, next) {

    // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', properties.clientHost);

    // Request methods you wish to allow
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    // Request headers you wish to allow
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

    // Set to true if you need the website to include cookies in the requests sent
    // to the API (e.g. in case you use sessions)
    res.setHeader('Access-Control-Allow-Credentials', true);

    // Pass to next layer of middleware
    next();
});
//app.use(methodOverride);

//app.use(express.static(path.join(__dirname, 'public')));

//storing models
app.use(function(req, res, next) {  
      req.models = app.models;  
      next();
    });

// Routes
app.use('/arcep', routes);
app.use('/arcep/users', users);
app.use('/arcep/typesOperateurs', typesOperateurs);
app.use('/arcep/domains', domains);
app.use('/arcep/categories', categories);
app.use('/arcep/donnees', donnees);
app.use('/arcep/arcep_data', arcepData);
app.use('/arcep/general_data', generalData);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});



module.exports = app;

I'm populating the session inside

router.post('/link1', function (req, res, next) {
  req.session.name = 'khalil';
});

And I'm trying to retrieve it inside

router.post('/link2', function (req, res, next) {
        console.log(req.session);
})

EDIT2

I found that if invoke the services from the browser directly, everything goes fine, but when trying that from the client app which is an angular app hosted on a tomcat server, the problem occurs.

The solution is to allow credentials in the angular app.

.config(function ($routeProvider, $httpProvider) {
    $httpProvider.defaults.withCredentials = true;

$http doesn't send cookie in Requests