[james_d_elliott]

Hey one of the Authelia developers here. Authelia works out of the box with Caddy's forward auth directive. In fact I helped Caddy develop and test the feature to ensure it had feature parity with an existing implementation/spec.

You have very granular options to customize the experience allowing multiple sites to have the same or different rules, which can alter the authentication requirements based on remote ip, users, groups, paths, domains, etc.