Just updated Anubis to v1.23.0 and it looks like something has changed 
Looking at the timelines from Tusky or Tuba, the timelines would not update. However the web UI of my GoToSocial instance still works fine. Checked the Anubis log and it looked like my Anubis was sending challenges to Tusky, Tuba and even to other fedi servers (Mastodon etc) 
So anyway I fixed it 馃 by creating new configuration file: /usr/local/share/doc/anubis/data/apps/allow-api-routes.yaml:
- name: allow-api-routes
action: ALLOW
expression:
all:
- '!(method == "HEAD")'
- path.startsWith("/api/")
And another one: /usr/local/share/doc/anubis/data/apps/allow-user-routes.yaml:
- name: allow-api-routes
action: ALLOW
expression:
all:
- '!(method == "HEAD")'
- path.startsWith("/users/")
And then adding the new configurations to /etc/anubis/<gotosocial_service_name>.botPolicies.yaml:
bots:
...
- import: /usr/local/share/doc/anubis/data/apps/allow-api-routes.yaml
- import: /usr/local/share/doc/anubis/data/apps/allow-user-routes.yaml
...
Restarted the Anubis service, and it works again after that. Dunno if that that is even the correct way to do it though. Hopefully i haven't weakened anything 