[keycloak-user] Basic auth and Authentication popup

Hi there, I have a war application deployed to tomcat that is currently secured with BASIC authentication through tomcat's realm. When I try to access secured page, the authentication popup appears. I would like to switch to keycloak securitu but I'm not sure if it is possible to configure keycloak to force this authentication popup. I tried setting it up but when I try to access the secured page, instead of authentication popup I am redirected to keycloak page "Client is not allowed to initiate browser login with given response_type. Standard flow is disabled for the client." I've followed the instructions from https://github.com/keycloak/keycloak/tree/master/examples/basic-auth and http://keycloak.github.io/docs/userguide/keycloak-server/html/ch08.html#t... . Is it possible to setup tomcat and keycloak so that the authentication popup would be forced to appear? Thanks