[keycloak-user] Missing Basic Authentication functionality for connecting to an OpenId Identity Provider

Hi, We are having an issue while connecting from keycloak to a certain OpenId Identity Provider. The OpenId Provider only supports logging in with Basic Authentication (client_id and client_secret), as specified in "token_endpoint_auth_methods_supported": [ "client_secret_basic” ] Currently keycloak does only support ‘posting' the client_id and client_secret. This will not work with the OpenID Identity Provider. Or maybe I don’t see how to configure it. Code: https://github.com/keycloak/keycloak/blob/63efee6e158c4a06d4948819cb36ccf... Can you confirm connecting to an OpenId Identity Provider with Basic Authentication is not implemented in keycloak. If this is not implemented I will make a JIRA issue. The OAuth RFC also states that it is recommended to use Basic Authentication over Posting. (see: https://tools.ietf.org/html/rfc6749#section-2.3.1). Kind regards, Ulrich Merckx Ontwikkelaar DEPARTEMENT OMGEVING Afdeling Data- en informatiebeheer en Digitale Maatschappij T 02 553 00 00, M 0478 69 59 18 Koning Albert II-laan 20 bus 8, 1000 Brussel www.omgevingvlaanderen.be<http://www.omgevingvlaanderen.be/> www.milieuinfo.be<http://www.milieuinfo.be/> [cid:88CF64B4-2C47-48FB-B4AF-3AEF93EE6B24@mmis.be]