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Area

dist/quarkus

Describe the bug

Propagated after upgrade to Quarkus 3.15.2 addressed by https://github.com/keycloak/keycloak/issues/35077.

For Quarkus 3.15.2, some changes around @HEAD, and @OPTIONS handling for sub-resources were made[1]. We are more interested in the @OPTIONS HTTP method that is used in preflight requests. When a sub-resource does not contain REST handler for @OPTIONS, a default response with default fields like 'Access-Control-Allow-Methods' is returned. However, in some places, we managed the @OPTIONS in a method redirecting to the subresource, so RESTEasy was not able to discover it.

In that case, different headers (from the new default response) were provided, that do not allow some methods hidden in sub-sub-resources.

It is a breaking change introduced in Quarkus 3.15.2 and addressed by: https://github.com/quarkusio/quarkus/issues/45173

For instance, the CorsPreflightService is not executed and the default response is returned:

https://github.com/keycloak/keycloak/blob/main/services/src/main/java/org/keycloak/services/resources/account/AccountLoader.java#L101

```

@Path("{version : v\\d[0-9a-zA-Z_\\-]*}")
@Produces(MediaType.APPLICATION_JSON)
public Object getVersionedAccountRestService(final @PathParam("version") String version) {
    if (request.getHttpMethod().equals(HttpMethod.OPTIONS)) {
        return new CorsPreflightService();
    }
    return getAccountRestService(getAccountManagementClient(session.getContext().getRealm()), version);
}

```

The workaround can be removed after upgrading to Quarkus 3.15.3

Version

999

Regression

[ ] The issue is a regression

Expected behavior

Possibility to use OPTIONS handler in sub-resources redirection

Actual behavior

Not possible to use OPTIONS handler in sub-resources redirection

How to Reproduce?

Send HTTP OPTIONS request to http://keycloak-instance/auth/realms/, or http://keycloak-instance/admin/serverinfo.

Anything else?

No response