flutter 注册接口调用问题

来源：4-3 Flutter登录与注册SDK设计实现

慕先生3072650

2021-11-07

请求header没有加入课程标识和 auth_token会报以下错误但视频里老师没有加这些时候不会报错会报DioError 请老师解答以下
[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type ‘Future<HiNetResponse>’ is not a subtype of type 'HiNetResponse?'
E/flutter (15423): #0 HiNet.fire (package:flutter_bill/http/core/hi_net.dart:23:7)
E/flutter (15423):
E/flutter (15423): #1 LoginDao._send (package:flutter_bill/http/dao/login_dao.dart:26:18)
E/flutter (15423):
E/flutter (15423): #2 _MyHomePageState.testLogin (package:flutter_bill/main.dart:99:20)
E/flutter (15423):

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