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报错信息：
Performing hot restart…
Syncing files to device AQM AL10…
/C:/Users/zsf/AppData/Local/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:699:8: Context: This is the overridden method (‘add’).
void add(String name, Object value,
^
/C:/Users/zsf/AppData/Local/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:708:8: Context: This is the overridden method (‘set’).
void set(String name, Object value,
^
/C:/Users/zsf/AppData/Local/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:699:8: Context: This is the overridden method (‘add’).
void add(String name, Object value,
^
/C:/Users/zsf/AppData/Local/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:708:8: Context: This is the overridden method (‘set’).
void set(String name, Object value,
^
Restarted application in 919ms.
解决方法：
将dio版本上升到最新版本【由于dio版本向前依赖导致错误，我发布这篇文章的版本号是 dio ^3.0.10 】
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