Why is expressjs not seeing the path?

Question

Node.js

module.exports = (function(app){
    var index = require('./index');
    var users = require('./users');

    app.use('/users', users);
    app.use('/', index);
});

var express = require('express');
var router = express.Router();

router.get('/', function(req, res, next) {
    console.log('index');
    res.json({message: "index"});
});

module.exports = router;

var express = require('express');
var router = express.Router();

router.get('/users', function(req, res, next) {
    console.log('users');
    res.json({message: "users"});
});

module.exports = router;

Why can I make requests to index, that is, "/", but not to "/users", 404?

Answer 1

app.use('/users', router.get('/users', ...)) == app.get('/users/users', ...)