Feature flags with Unleash in Angular application

I’m trying to configure feature flags in my angular application. (Followed this guide: Guide) .
Using ‘unleash’ library and unleash-proxy with a docker instance everything is working fine on local server (pointing to localhost: 3000) . My question is, do i have to setup a proxy also for my production environment and send requests to that? When i send request to feature flags API.
https://gitlab.com/api/v4/feature_flags/unleash/****` i get 401 error. Is it possible to use feature_flags API without a proxy? I can’t find a solution around and i hope someone will help me. Thank you.