无法使用多语言代码点火器清除URL中的默认控制器

当我登录主页www.domain.com（默认控制器为"home"）时，浏览器会重定向到www.domain.com/en/home。我想看到的是www.domain.com/en（我认为谷歌会将这些页面视为重复内容？）

是否可以将默认控制器排除在URL之外，以便只有语言遵循域（即www.domain.com/en）？

下面是我的代码：

$route['default_controller'] = "Home";
$route['404_override'] = '';
// '/en', '/es' URIs -> use default controller
$route['^(en|es)$'] = 'home'; //$route['default_controller']; //'home'

// route es translation of girls to girls
$route['es/chicas'] = "girls";
$route['es/chicas/chica/(:num)/(:any)'] = "girls/girl/$1/$2";
$route['es/chicas/etiquetas/(:num)/(:any)'] = "girls/tags/$1/$2";
// movies es routes
$route['es/peliculas'] = "movies";
$route['es/peliculas/pelicula/(:num)/(:any)'] = "movies/movie/$1/$2";
$route['es/fotos/galeria/pelicula/(:num)/(:any)'] = 'photos/gallery/movie/$1/$2';
$route['es/peliculas/etiquetas/(:num)/(:any)'] = "movies/tags/$1/$2";
$route['es/unirse'] = "join";
// general catch all for anything that doesn't fit rules above, but doesn't have a 
// language prefix e.g. en/girls -> girls controller
$route['^(en|es)/(.+)$'] = "$2";