extern void afb_xreq_fail(struct afb_xreq *xreq, const char *status, const char *info);
extern void afb_xreq_fail_f(struct afb_xreq *xreq, const char *status, const char *info, ...);
extern void afb_xreq_success_f(struct afb_xreq *xreq, struct json_object *obj, const char *info, ...);
extern void afb_xreq_fail(struct afb_xreq *xreq, const char *status, const char *info);
extern void afb_xreq_fail_f(struct afb_xreq *xreq, const char *status, const char *info, ...);
extern void afb_xreq_success_f(struct afb_xreq *xreq, struct json_object *obj, const char *info, ...);