auth_set_up_and_testing.server.snippet2.js

// server.js 
...
app.use(express.static(path.join(__dirname, '/public'))); //Expose /public
// routes ======================================================================
require('./app/routes.js')(app, passport); // load our routes and pass in our app and fully configured passport

// catch all other routes and have index.html handle them. 
app.get('*', function (req, res){
    res.sendFile(path.join(__dirname+ '/public/views/index.html'));
});

...