So after reading here and there on MEAN, I decided to make my first MEAN application which is pretty small, all seems to work except the routeing to make my app a one-page app. Any help would be much appreciated!
 app.config(function($routeProvider){
   $routeProvider
     .when('/', {
       templateUrl: 'main.html',
       controller: 'mainController'
     })
     .when('/login', {
       templateUrl: 'login.html',
       controller: 'authController'
     })
     .when('/register', {
       templateUrl: 'register.html',
       controller: 'authController'
     });
 });
Anyway, I adopted a boilerplate navigation bar
       <nav class="navbar-fluid navbar-default navbar-fixed-top">
         <div class="container">
           <a class="navbar-brand" href="#">IoT</a>
           <p class="navbar-text">IoT</p>
           <p class="navbar-right navbar-text" ng-hide="authenticated"><a href="#/login">Login</a> or <a href="#/register">Register</a></p>
           <p class="navbar-right navbar-text" ng-show="authenticated"><a href="#" ng-click="signout()">Logout</a></p>
           <p class="navbar-right navbar-text" ng-show="authenticated">Signed in as {{current_user}}</p>
         </div>
       </nav>
And, when I run it on localhost:3000, the homepage address I got instead is
 http://localhost:3000/#!/
where I was expecting
 http://localhost:3000/#/
And when I clicked on the 'register' link, the address I got is
 http://localhost:3000/#!/#%2Fregister
where as I was expecting
 http://localhost:3000/#/register
Is that normal? Maybe it's bcs of the version of Angular I was using?
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.0/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.0/angular-route.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.0/angular-resource.min.js"></script>
It was all fine before, but then I stripped down the HTML and make the main page pull individual HTML pages one-by-one then this happened.
 
     
     
     
    