Symfony allow access for anonymous users and logged in users

I have a route with a response in json to make accessible for logged in users but also anonymous users but in this case with a response with a status code 401.

I tried to add a firewall;

route_name:
    pattern: ^/path
    anonymous: true

but with this configuration, i get always an anonymous user (in profiler), even if user is logged in.

I tried also adding configuration in access_control instead;

access_control:
    - { path: ^/path, role: IS_AUTHENTICATED_ANONYMOUSLY }

but i keep getting the login form instead.

Any idea how to handle this case? Thanks