old_contents: var port = process.env.PORT || '3000';
  var express = require('express');
  var app = 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 io = require('socket.io')(http)
  var session = require('express-session')
  var passport = require('passport')
  var flash = require('connect-flash')
  
  var http = require('http').Server(app)
  
  var index = require('./routes/index');
  const signup = require('./routes/signup');
  const login = require('./routes/login');
  const secret = require('./routes/secret');
  var setupPassport = require('./passportSetup')
  
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'hbs');
  
  // 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: false }));
  app.use(cookieParser());
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(session({secret: 'use a config var in production'})) //SEE THIS
  app.use(passport.initialize())
  app.use(passport.session())
  setupPassport()
  
  app.use('/', index);
  
  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
  });
  
  app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};
  
    // render the error page
    res.status(err.status || 500);
    res.render('error');
  });
  
  io.on('connection', function(socket) {
    console.log('connection made');
  })
  
  http.listen(port, function() {
    console.log('listening on localhost:3000');
  })
  
  // error handler
  
  module.exports = app;
  
new_contents: var port = process.env.PORT || '3000';
  var express = require('express');
  var app = 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 io = require('socket.io')(http)
  var session = require('express-session')
  var passport = require('passport')
  var flash = require('connect-flash')
  const cors = require('cors');
  
  var http = require('http').Server(app)
  
  var index = require('./routes/index');
  const signup = require('./routes/signup');
  const login = require('./routes/login');
  const secret = require('./routes/secret');
  var setupPassport = require('./passportSetup')
  
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'hbs');
  
  // 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: false }));
  app.use(cookieParser());
  app.use(express.static(path.join(__dirname, 'public')));
  app.use(cors())
  app.use(session({secret: 'use a config var in production'})) //SEE THIS
  app.use(passport.initialize())
  app.use(passport.session())
  setupPassport()
  
  app.use('/', index);
  
  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
  });
  
  app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};
  
    // render the error page
    res.status(err.status || 500);
    res.render('error');
  });
  
  io.on('connection', function(socket) {
    console.log('connection made');
  })
  
  http.listen(port, function() {
    console.log('listening on localhost:3000');
  })
  
  // error handler
  
  module.exports = app;
  
subject: add cors