我怀疑代理设置没有正确设置，或者我可能有误，请在这里帮助我。我正在公司网络下工作并使用VPN。
下面的错误详细信息：
Launching lib\main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...
Resolving dependencies...
* Error running Gradle:
ProcessException: Process "D:\flutter_workspace\flutter_app\android\gradlew.bat" exited abnormally:
Starting a Gradle Daemon (subsequent builds will be faster)
FAILURE: Build failed with an exception.
Finished with error: Please review your Gradle project setup in the android/ folder.
* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.
> Could not resolve com.android.tools.build:gradle:3.2.1.
Required by:
project :
> Could not resolve com.android.tools.build:gradle:3.2.1.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom'.
> Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom'.
> Connect to dl.google.com:443 [dl.google.com/172.217.9.14] failed: Connection refused: connect
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 17s
Command: D:\flutter_workspace\flutter_app\android\gradlew.bat app:properties