Flutter http导入错误提示

flutter 项目导入http.dart 包

void main() {
  String dataUrl = 'https://jsonplaceholder.typicode.com/posts';
  http.Response response = await http.get(dataUrl);
}

运行报如下错误：

The following Dart file:
  /Users/lulu/AndroidStudioProjects1/flutter_app/lib/main.dart
...refers, in an import, to the following library:
  package:http/http.dart
That library is in a package that is not known. Maybe you forgot to mention it in your pubspec.yaml file?

按照错误提示，在 pubspec.yaml中添加http依赖库即可

dependencies:
  http: ^0.12.0
  flutter:
    sdk: flutter