I'm using express-generator.
The following codes are in app.js
1- The following two routings:
 **app.use('/', indexRouter);
app.use('/users', usersRouter);**
2- Andthe following are defined
  **var indexRouter = require('./routes/index');
  var usersRouter = require('./routes/users');**
The following codes are modules: 1- users.js with the following code
 **var express = require('express');
 var router = express.Router();
 /* GET users listing. */
 router.get('/', function(req, res, next) {
  res.send('respond with a resource');
});
module.exports = router;**
2- index.js with the following code
  **var express = require('express');
  var router = express.Router();
  /* GET home page. */
  router.get('/', function (req, res, next) {
  res.render('index', {
     title: 'Express',
     condition: true
  });
  });
  module.exports = router;**
My question: if I hit the following URL     (http://localhost/)     then the
app.use('/', indexRouter);       shall be called . 
and when I hit      (http://localhost/users)     the same URL shall be called which is      app.use('/', indexRouter);      because      use      finds the first matched pattern which it is     /   . But it calls      app.use('/users', usersRouter)       instead.
If it's get instead of use then its OK and making sense for me, could anybody explain this code behavior? thnx