Not getting any response for save - express

Question

Whenever I request on 8081/list_user there is no response. When I open localhost:8081 I get a response but not for localhost:8081/list_user.Both files are in the same folder is there any issues with that.Please check this issue what's problem in that.
// grab the things we need schema.js file
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
// create a schema
var userSchema = new Schema({
name: String,
});
// the schema is useless so far
// we need to create a model using it
var User = mongoose.model('User', userSchema);
// make this available to our users in our Node applications
console.log("Schema")
module.exports = User;
////////////Next file
var express = require('express');
var app = express();
var User = require('./schema');
// This responds with "Hello World" on the homepage
app.get('/', function (req, res) {
console.log("Got a GET request for the homepage",User);
res.send('Hello GET');
})
// This responds a POST request for the homepage
app.post('/', function (req, res) {
console.log("Got a POST request for the homepage");
res.send('Hello POST');
})
// This responds a DELETE request for the /del_user page.
app.delete('/del_user', function (req, res) {
console.log("Got a DELETE request for /del_user");
res.send('Hello DELETE');
})
// This responds a GET request for the /list_user page.
app.get('/list_user', function (req, res) {
console.log("Got a GET request for /list_user");
var newUser = User({
name: 'Peter Quill',
});
// save the user
newUser.save(function(err) {
if (err) throw err;
res.send('User created!');
console.log('User created!');
});
})
// This responds a GET request for abcd, abxcd, ab123cd, and so on
app.get('/find', function(req, res) {
User.find({}, function(err, users) {
if (err) throw err;
// object of all the users
console.log(users);
res.send(users)
});
})
var server = app.listen(8081, function () {
var host = server.address().address
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port)
})

Answer 1

When I tested .save function the way it was I couldn't even get an error message. What I did was add a connection with my local database (at schema file) to test properly.
mongoose.connect('mongodb://localhost/test');
In order to do this, first you have to certify that you have a local mongodb server running (or you could just connect to an online server), mongoose.connect receives my connection string as parameter ("test" is the database name, if it doesn't exist it will be created automatically). Last thing I did was add new when I create an user.
var newUser = new User({
name: 'teste',
});