How to fix 'The GET method is not supported for this route. Supported methods: POST'

I'm developing a REST service with Laravel to consume it from a mobile app. It works properly on local, but not on hosting. After several tries, I developed a basic example to test the POST method, but it returns the same error.

api.php file

Route::post('/test', 'testController@test') ;

testController.php file

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class testController extends Controller
{
    //
    public function test(Request $request)
    {
        return response()->json(['mensaje' => 'POST access successful']); 
    }
}

POST request is always returning the same error, and I am using POST on petition: 405 Method Not Allowed. The GET method is not supported for this route. Supported methods: POST.

POSTMAN request

I have investigated this topic and I have read it could be due CORS. So, I have installed spatie/laravel-cors with its default config, but POSTMAN is still showing the same error. Some help, please?

via Chebli Mohamed