[keycloak-user] Response for preflight is invalid (redirect)

Hi, I need some pointer on how to debug the issue with Response for preflight is invalid (redirect). I have made a client running on localhost:3000, and a REST-service running on localhost:8080. I've followed the tutorials for https://github.com/keycloak/keycloak-quickstarts/blob/latest/service-jee-... to make my service. In keycloak I've made a client for the client and a client for the service. I've read somewhere that webOrigin could be an issue, but not sure. I've set enable-cors=true for the service. access type public Root URL: http://localhost:3000 Valid Redirect URIs: http://localhost:3000/* Base URL is empty Admin URL http://localhost:3000 Web Origins http://localhost:3000 I've also read that I need to install undertow-cors-filter in wildfly (running wildfly 11.0.0.Final and Keycloak 3.4.3.Final), but I haven't done this yet. Where should I look to dig into this? Best regards, Viggo Navarsete