language abbreviation in url

Hello everybody,

I am working with codeigniter 4. I have a problem.
how can i recognize language abbreviation in url.

with

PHP Code:

$routes->get('{locale}/books', 'App\Books::index'); 


I tried but the problem is the following.

1. for all routes {locale} must be defined.
2. without language abbreviation the controller is not found.
3. $routes->setAutoRoute(true); no longer works.

it has to work like this:
when user enters the URL:
www.domain.com requires its browser language to be recognized and redirected to www.domain.com/en/

and if user enters the URL www.domain.com/de/ the locale must be changed in German.

this must work as well:
http://www.domain.com/contoller/method redirect to http://www.domain.com/en/contoller/method

I look forward to your suggestions
thanks

Hi,
did you find any solution? I am struggling the same problem now. Thanks in advance.