尽管显式设置了代理,但flatter run-behind代理无法下载gradle依赖项

> $env:http_proxy="127.0.0.1:8090"
> $env:https_proxy="127.0.0.1:8090"
> $env:NO_PROXY="localhost,127.0.0.1"

> flutter create app
> cd app
> flutter run

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not find com.android.tools.build:gradle:3.5.0.
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.0/gradle-3.5.0.pom
       - https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.0/gradle-3.5.0.jar
     Required by:
         project :

* 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 3s

我知道使用VPN也是一种选择。但我更喜欢用代理。 操作系统:Windows 10