Anonymous read-only access to OBS

Hello!

I want to allow anonymous users to access OBS projects, read and download, like in build.opensuse.org
I’ve read the docs and add following lines to /srv/www/obs/api/config/options.yml

allow_anonymous: true
webui_host: my_hostname
webui_url: https://my_hostname:443

And it’s not working, I still get 401 Unauthorized.
What am I missing?