Hello,
We noticed this error when working with Keycloak and using multiple tabs in the browser:

Sometimes automatic reauthentication on SSO session expiry does not work.
The cause is documented in the Keycloak documentation:
https://www.keycloak.org/securing-apps/oidc-layers#_oidc-errors :

https://www.keycloak.org/docs/latest/server_admin/#_authentication-sessions :

As you can see they say:
When a client application receives this type of error, it is ideal to retry authentication immediately and send a new OIDC authentication request to the Keycloak server.
But it seems lua-resty-opendic does not handle this type of errror. Can you confirm ?
Thanks a lot ;)