Auto redirect to root folder

[malayvuong]

When I connect on below link, website will auto redirect to new url:

• http://localhost:8888/ci4/public/admin redirect to http://localhost:8888/admin
• http://localhost:8888/ci4/public/admin/ redirect to http://localhost:8888/admin
• http://localhost:8888/ci4/public/admin/auth/ redirect to http://localhost:8888/admin/auth

But when I connect to http://localhost:8888/ci4/public/admin.html; and routes realized that i connect to V_admin Controllers, and website has print contents of admin page.

I think the issue here is when i connect a folders not exists, website will auto redirect to root folder. On my source code, I set V_admin for admin controllers.
My Routes:

$routes->group('/admin', function($routes)
{
	//	Authentication
	$routes->add('auth.html', 'VAdmin\Controllers\Auth::index');
	$routes->add('auth/(:alpha).html', 'VAdmin\Controllers\Auth::index/$1');
	
	$routes->add('blog',  'Admin\Blog::index');
});
$routes->add('/admin', 'VAdmin\V_admin::index');

I don't know how to fix it or find any problems with my localhost. I used MAMP Pro on Mac Sierra. And CI3 run very well.