[Error record] The command line to create a Flutter application reported an error pub get failed (server unavailable) - attempting retry 1 in 1 second...

Officially recommended Chinese mirror: https://flutter.dev/community/china

The cause of the problem was found, the Flutter mirror of Shanghai Jiaotong University failed, or temporarily failed; (anyway, it is useless today)

Shanghai Jiaotong University Linux User Group
FLUTTER_STORAGE_BASE_URL: https://mirrors.sjtug.sjtu.edu.cn/
PUB_HOSTED_URL: https://dart-pub.mirrors.sjtug.sjtu.edu.cn/

After using the official mirror, execute the flutter create flutter_cmd command to create the application successfully;

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

Mirror needs to be set to environment variables;

1. Error message

---

Use the command line to create a Flutter application, the command is as follows:

flutter create flutter_cmd

Create a Flutter application, the application name is flutter_cmd;

Error message:

D:\002_Project\002_Android_Learn\Flutter_Cmd>flutter create flutter_cmd
Creating project flutter_cmd... androidx: true
  flutter_cmd\.gitignore (created)
  flutter_cmd\.idea\libraries\Dart_SDK.xml (created)
  flutter_cmd\.idea\libraries\Flutter_for_Android.xml (created)
  flutter_cmd\.idea\libraries\KotlinJavaRuntime.xml (created)
  flutter_cmd\.idea\modules.xml (created)
  flutter_cmd\.idea\runConfigurations\main_dart.xml (created)
  flutter_cmd\.idea\workspace.xml (created)
  flutter_cmd\.metadata (created)
  flutter_cmd\android\app\build.gradle (created)
  flutter_cmd\android\app\src\main\kotlin\com\example\flutter_cmd\MainActivity.kt (created)
  flutter_cmd\android\build.gradle (created)
  flutter_cmd\android\flutter_cmd_android.iml (created)
  flutter_cmd\android\.gitignore (created)
  flutter_cmd\android\app\src\debug\AndroidManifest.xml (created)
  flutter_cmd\android\app\src\main\AndroidManifest.xml (created)
  flutter_cmd\android\app\src\main\res\drawable\launch_background.xml (created)
  flutter_cmd\android\app\src\main\res\mipmap-hdpi\ic_launcher.png (created)
  flutter_cmd\android\app\src\main\res\mipmap-mdpi\ic_launcher.png (created)
  flutter_cmd\android\app\src\main\res\mipmap-xhdpi\ic_launcher.png (created)
  flutter_cmd\android\app\src\main\res\mipmap-xxhdpi\ic_launcher.png (created)
  flutter_cmd\android\app\src\main\res\mipmap-xxxhdpi\ic_launcher.png (created)
  flutter_cmd\android\app\src\main\res\values\styles.xml (created)
  flutter_cmd\android\app\src\profile\AndroidManifest.xml (created)
  flutter_cmd\android\gradle\wrapper\gradle-wrapper.properties (created)
  flutter_cmd\android\gradle.properties (created)
  flutter_cmd\android\settings.gradle (created)
  flutter_cmd\ios\Runner\AppDelegate.swift (created)
  flutter_cmd\ios\Runner\Runner-Bridging-Header.h (created)
  flutter_cmd\ios\Runner.xcodeproj\project.pbxproj (created)
  flutter_cmd\ios\Runner.xcodeproj\xcshareddata\xcschemes\Runner.xcscheme (created)
  flutter_cmd\ios\.gitignore (created)
  flutter_cmd\ios\Flutter\AppFrameworkInfo.plist (created)
  flutter_cmd\ios\Flutter\Debug.xcconfig (created)
  flutter_cmd\ios\Flutter\Release.xcconfig (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Contents.json (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-1024x1024@1x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-20x20@1x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-20x20@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-20x20@3x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-29x29@1x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-29x29@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-29x29@3x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-40x40@1x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-40x40@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-40x40@3x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-60x60@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-60x60@3x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-76x76@1x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-76x76@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\AppIcon.appiconset\Icon-App-83.5x83.5@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\LaunchImage.imageset\Contents.json (created)
  flutter_cmd\ios\Runner\Assets.xcassets\LaunchImage.imageset\LaunchImage.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\LaunchImage.imageset\LaunchImage@2x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\LaunchImage.imageset\LaunchImage@3x.png (created)
  flutter_cmd\ios\Runner\Assets.xcassets\LaunchImage.imageset\README.md (created)
  flutter_cmd\ios\Runner\Base.lproj\LaunchScreen.storyboard (created)
  flutter_cmd\ios\Runner\Base.lproj\Main.storyboard (created)
  flutter_cmd\ios\Runner\Info.plist (created)
  flutter_cmd\ios\Runner.xcodeproj\project.xcworkspace\contents.xcworkspacedata (created)
  flutter_cmd\ios\Runner.xcworkspace\contents.xcworkspacedata (created)
  flutter_cmd\lib\main.dart (created)
  flutter_cmd\flutter_cmd.iml (created)
  flutter_cmd\pubspec.yaml (created)
  flutter_cmd\README.md (created)
  flutter_cmd\test\widget_test.dart (created)
Because flutter_cmd depends on cupertino_icons any which doesn't exist (could not find package cupertino_icons at https://storage.flutter-io.cn), version solving failed.
pub get failed (server unavailable) -- attempting retry 1 in 1 second...
Because flutter_cmd depends on cupertino_icons any which doesn't exist (could not find package cupertino_icons at https://storage.flutter-io.cn), version solving failed.
pub get failed (server unavailable) -- attempting retry 2 in 2 seconds...
Because flutter_cmd depends on cupertino_icons any which doesn't exist (could not find package cupertino_icons at https://storage.flutter-io.cn), version solving failed.
pub get failed (server unavailable) -- attempting retry 3 in 4 seconds...
Because flutter_cmd depends on cupertino_icons any which doesn't exist (could not find package cupertino_icons at https://storage.flutter-io.cn), version solving failed.
pub get failed (server unavailable) -- attempting retry 4 in 8 seconds...
Running "flutter pub get" in flutter_cmd...                            |终止批处理操作吗(Y/N)? y

D:\002_Project\002_Android_Learn\Flutter_Cmd>

Second, the solution

---

The two sources of Flutter are not set correctly. I have encountered this problem before, and it is also caused by source failure;

【错误记录】Flutter 报错 Downloading the Dart SDK using the BITS service failed, retrying with WebRequest…

Use the source of the official Chinese community to complete the command line creation;

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