问AngularJS错误回调中的标头值

EN

            Model.save(obj, onSaveSuccess, onSaveError);
            var onSaveError = function(res)
            {

            };

            var onSaveSuccess = function(res)
            {

            };

@RequestMapping(value = "/models", method = RequestMethod.PUT, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Model> updateModel(@RequestBody Model model) 
........
return ResponseEntity.badRequest().headers(HeaderUtil.createAlert("Failure", "I am here")).body(null);
}