[keycloak-dev] unsupported media type error

I'm trying to test Openstack ECP with Keycloak. When Openstack posts the SAML AuthnRequest wrapped in SOAP to the /auth/realms/master/protocol/saml endpoint keycloak responds with an HTTP 415 unsupported media type error. The HTTP Content-Type in the post is text/xml. What are you expecting? This is with the 1.8.0.CR1 version of keycloak. Thanks! -- John