Hi, I have a direct grant flow working correctly and returning all the information I need using Mappers when the response is OK. However, I would like to include more information in the error response when my Federator doesn't authenticate the username, specifically, my own federator's error codes/messages. I've been reading the RFC and there is a parameter called error_description in the error response, but not sure how to add a json there (it is supported by the USASCII chars, afaik). This is my architecture: Mobile client ---direct access grant---> Keycloak -------validateUser----> Federator If Error Federator ----response---> MyFederatorProvider (on validate() method, parse the response and somehow include the error coming from the federator inside the error_description field of the standard OAuth 2.0 response). Can someone please give me a hint on this? Is there any other (better/cleaner) way to do this? Thanks in advance! -- *Fabricio Milone* Developer * * * Shine Consulting * 30/600 Bourke Street Melbourne VIC 3000 T: 03 8488 9939 M: 04 3200 4006 www.shinetech.com <http://www.shinetech.com/>/*a*/ passion for excellence _______________________________________________ keycloak-user mailing list keycloak-user(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/keycloak-user