尽管明确设置了代理，flutter 在代理后运行仍无法下载 gradle 依赖项

Question

Flutter is supposed to use proxy env vars when fetching dependencies but it fails to do so.

> $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

I know using a VPN is an option too. But I prefer to use a proxy. OS: Windows 10

Answer 1

If you are behind proxy you have to set proxy for gradle explicitly AGAIN which means gradle doesn't respect env vars that is kind of annoying. anyway here you go.

create a gradle.properties file under .gradle directory in your home folder.

code ~/.gradle/gradle.properties

Paste the following into it

systemProp.http.proxyHost={ProxyIP}
systemProp.http.proxyPort={ProxyPort}
systemProp.http.nonProxyHosts=*.jitpack.io, *.maven.org
systemProp.https.proxyHost={ProxyIP}
systemProp.https.proxyPort={ProxyPort}
systemProp.https.nonProxyHosts=*.jitpack.io, *.maven.org

In my case maven.org and jitpack.io domains can be browsed directly.

And don't forget to run flutter clean before flutter run . To see what's going on run flutter run -v