Compiler message:
../../flutter/.pub-cache/hosted/pub.flutter-io.cn/dio-2.2.2/lib/src/dio_http_headers.dart:55:8: Error: The method 'DioHttpHeaders.add' has fewer named arguments than those of overridden method 'HttpHeaders.add'.
void add(String name, value) {
^
org-dartlang-sdk:///third_party/dart/sdk/lib/_http/http.dart:694:8: Context: This is the overridden method ('add').
void add(String name, Object value,
^
../../flutter/.pub-cache/hosted/pub.flutter-io.cn/dio-2.2.2/lib/src/dio_http_headers.dart:70:8: Error: The method 'DioHttpHeaders.set' has fewer named arguments than those of overridden method 'HttpHeaders.set'.
void set(String name, Object value) {
^
org-dartlang-sdk:///third_party/dart/sdk/lib/_http/http.dart:703:8: Context: This is the overridden method ('set').
void set(String name, Object value,
上面报的这个错是dio版本问题，解决方法是修改pubspec.yaml 文件下的dio版本。
dio: ^3.0.9
再次运行：成功。
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