Hello Eric,
Since response parameters are returned in the Redirection URI fragment value, the Client needs to have the User Agent parse the fragment encoded values and pass them to on to the Client's processing logic for consumption.
http://openid.net/specs/openid-connect-core-1_0.html#FragmentNotes
Also, you can specify the response_mode param in the authorization request: query, fragment or form_post
http://openid.net/specs/oauth-v2-multiple-response-types-1_0.html#ResponseModes
http://openid.net/specs/oauth-v2-form-post-response-mode-1_0.html#FormPostResponseMode
Please check the following tests for response_mode param:
https://github.com/GluuFederation/oxAuth/blob/master/Client/src/test/java/org/xdi/oxauth/ws/rs/AuthorizationResponseModeHttpTest.java
Regards
Javier