= Valid redirect URIs for clients are always compared with exact string matching
Version 1.8.0 introduced a lower-case for the hostname and scheme when comparing a redirect URI with the specified valid redirects for a client. Unfortunately it did not fully work in all the protocols, and, for example, the host was lower-cased for `http` but not for `https`. As https://datatracker.ietf.org/doc/html/draft-ietf-oauth-security-topics#name-protecting-redirect-based-f[OAuth 2.0 Security Best Current Practice] advises to compare URIs using exact string matching, {project_name} will follow the recommendation and for now on valid redirects are compared with exact case even for the hostname and scheme.
For realms relying on the old behavior, the valid redirect URIs for their clients should now hold separate entries for each URI that should be recognized by the server.
Although it introduces more steps and verbosity when configuring clients, the new behavior enables more secure deployments as pattern-based checks are frequently the cause of security issues. Not only due to how they are implemented but also how they are configured.
= Operator -secrets-store Secret
Older versions of the operator created a Secret to track watched Secrets. Newer versions of the operator no longer use the -secrets-store Secret, so it may be deleted.
If you are on 23.0.0 or 23.0.1 and see "org.keycloak.operator.controllers.KeycloakAdminSecretDependentResource -> java.lang.IllegalStateException: More than 1 secondary resource related to primary" in the operator log then either delete the -secrets-store Secret, or upgrade to 23.0.2 where this is no longer an issue.
