Flutter更新sdk时报错

Failed to download

https://storage.googleapis.com/flutter_infra_release/flutter/fonts/3012db47f3130e62f7cc0beabff968a33cbec8d8/fonts.zip.

Ensure you have network connectivity and then try again.

HandshakeException: Connection terminated during handshake

解决办法：

Windows 增加用户变量

FLUTTER_STORAGE_BASE_URL

https://storage.flutter-io.cn

Mac执行命令：

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