laravel RouteServiceprovider redirect() not working

RouteServiceProvider.php 

public function boot()

    {

       $str= request()->getRequestUri();

       if(str_contains($str, '/index.php'))

       {

           header("Location: https://www.example.com/");

           exit();

       }

       if(str_contains($str, '/public/'))

       {

           header("Location: https://www.example.com/");

           exit();

       }

   

        parent::boot();

    }