[keycloak-user] Token validation and public client

Hi, I found a shell script to use the new introspection path to do token validation: http://lists.jboss.org/pipermail/keycloak-user/2016-April/005869.html I'm using public client and by removing : KC_CLIENT_SECRET=a-test-client-credental The result is: {"error_description":"Authentication failed.","error":"invalid_request"} It is possible to use validation token for public clients ? Thanks!