解决Failed to retrieve the Dart SDK from: https://storage.googleapis.com/flutter_infra/问题

mac终端执行flutter -h命令后，出现过

Failed to retrieve the Dart SDK from: https://storage.googleapis.com/flutter_infra/flutter/91a63d6a44c56ca13baadccedc46fd66b001fdbc/dart-sdk-darwin-x64.zip

If you're located in China, please see this page:

https://flutter.dev/community/china

这个问题。

解决办法

执行flutter -h之前，先执行一下命令

export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

成功之后：