extern void afb_xreq_reply(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info);
extern void afb_xreq_reply_f(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info, ...);
extern void afb_xreq_reply(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info);
extern void afb_xreq_reply_f(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info, ...);