ListUserController.php

<?php

namespace App\Controller;

use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class UserAction
{  
     /**
     * @Route("/users",
     *       name="get",
     *       methods="GET",
     *       defaults={
     *          "_validator": {
     *              "limit":"Positive"
     *       }
     * })
     */
    public function search(Request $request): Response
    {
        $errors = $request->attributes->get('_errors');

        if ([] !== $errors) {
            return new JsonResponse($this->formatError($errors), 400);
        }
        
        // boring stuff, fetch users...
        return new JsonResponse($users, 201);
    }
}