[keycloak-user] Disable HTTP2 in Keycloak 4.6 container?

It looks like the wildfly server used for the Keycloak 4.6.0.Final image is configured to use HTTP2. Is there an easy way to disable this? I think it might be the cause of some strange behaviour in Chrome, similar to as described here: https://issues.jboss.org/browse/KEYCLOAK-2656. The related 'test http2' issue is pending for the Keycloak 5.x release, so i assume Keycloak 4.x does not officially support HTTP2, is that correct? Kind regards, Gareth