1. Error: The method 'DioHttpHeaders.add' has fewer named arguments than those
    2. Context: This is the overridden method ('add'). void add(String name, Object value,

    原因：dio第三方库向前兼容差，之前的方法没见到
    解决：升级至最新dio版本
    **

    Flutter Dart 报错 ‘_InternalLinkedHashMap dynamic, dynamic’ is not a subtype of type’

    1. new Map<String, dynamic>.from(params)

    flutter 通过Dio调用接口报错 “is not a subtype of type ‘DioError’”