Per-application disabling of auth

[richfitz]

This is a feature request - please feel free to just say no 😁

In https://www.shinyproxy.io/configuration/ the auth and users are set at the whole proxy level and access is given via lines like:

    access-groups: [scientists, mathematicians]

Am I right that there is no way of per-application entirely removing the authentication requirement (I think that means that there will be no load balancing either, right?). Would supporting something like a per-application disabling of authentication be something you'd be willing to support?

[fmichielssen]

Removing authentication from the /app/... URLs will be straightforward, but supporting anonymous users on the index page requires some additional work I believe.
Also, some authentication backends like OpenID and Keycloak have additional filters installed, those will have to be adjusted as well.

[LEDfan]

See issue #330 for an explanation why this is quite difficult to achieve.