RESTEasy mapping a "legacy" Moodle REST service

I'm trying to map a "legacy" REST server using RESTEasy client. The urls of this ws are mapped like this: http://localhost/webservice/rest/server.php?wstoken=reallylongtokenhash&wsfunction=core_course_get_courses The endpoint is always server.php, and the function to call is mapped using a queryparam. @POST @Path("/server.php") @Produces("application/json") List<Map<String, Object>> getCourses( @QueryParam("wstoken") String token , @QueryParam("wsfunction") String function , @QueryParam("moodlewsrestformat") String format); @POST @Path("/server.php") @Produces("application/json") String createUser( @QueryParam("wstoken") String token , @QueryParam("wsfunction") String function , @QueryParam("moodlewsrestformat") String format , @Form User user); which I call in this way private static void getCourses() { final MoodleRest client = ProxyFactory.create(MoodleRest.class, "http://localhost/webservice/rest/"); final List<Map<String, Object>> s = client.getCourses(token, "core_course_get_courses", "json"); System.out.println("s = " + s); } Let's ignore the fact that a "get_courses" method is mapped using a POST, and that the token are passed using the QueryParameter on this post, is it possible to avoid passing the function and the response format on every method? I would like to map it using the annotations. I tried to write in directly into the @Path using /server.php?function=core_course_get_courses But obviously this is not the right way to proceed (plus, it doesn't work since it's escaped)