问题： Flutter Exception: Pub will wait for a while before trying to connect again.
解决
1.设置终端代理
export http_proxy=http://127.0.0.1:1080;
export https_proxy=http://127.0.0.1:1080;
2.使用curl google.com测试是否连通
curl google.com
3.禁用设置的镜像源
unset FLUTTER_STORAGE_BASE_URL;
unset PUB_HOSTED_URL;
4.检查是否可上传
flutter packages pub publish --dry-run --server=https://pub.dartlang.org
5.上传
flutter packages pub publish --server=https://pub.dartlang.org