ilam5上的Alamofire（模拟器和真实设备）iOS 9.2

Question

我的APP使用Alamofire库（3.0）与服务器通信。在iphone5S / iphone6 / iphone6-plus上工作正常。今天我在iphone5上测试它，我发现问题：服务器回答正确的数据（JSON），但在APP中，缺少一些数据字段。感谢任何帮助！代码段和评论如下：

AFManager.request(.GET, URLString, parameters: params, headers: headers).responseJSON { (json) -> Void in
            if (json.response == nil) {
                completion(nil, "connect to server failed!")
            } else {
                if (json.response?.statusCode)! == 200 {
                    if json.result.isSuccess {
                        let dict = json.result.value //the "value" field's content is a dictionary, having a field named "data", on iphone5, this field is missing, so the rest code can not work correctly. 
                        completion(dict, "")
                    }
                } else if (json.response?.statusCode)! == 401 {
                    completion(nil, "401")
                } else {
                    completion(nil, "unknown error occured")
                }
            }