今天在Android Studio上，sync工程的时候遇到了下面的问题：

Plugin [id: 'org.gradle.kotlin.kotlin-dsl', version: '4.0.6'] was not found in any of the following sources:

* Try:
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Exception is:
org.gradle.api.plugins.UnknownPluginException: Plugin [id: 'org.gradle.kotlin.kotlin-dsl', version: '4.0.6'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'org.gradle.kotlin.kotlin-dsl:org.gradle.kotlin.kotlin-dsl.gradle.plugin:4.0.6')
  Searched in the following repositories:
    Gradle Central Plugin Repository
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.resolveToFoundResult(DefaultPluginRequestApplicator.java:237)
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.lambda$resolvePluginRequests$3(DefaultPluginRequestApplicator.java:167)
	at org.gradle.util.internal.CollectionUtils.collect(CollectionUtils.java:212)
	at org.gradle.util.internal.CollectionUtils.collect(CollectionUtils.java:206)
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.resolvePluginRequests(DefaultPluginRequestApplicator.java:165)
	at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.applyPlugins(DefaultPluginRequestApplicator.java:100)
	at org.gradle.kotlin.dsl.provider.PluginRequestsHandler.handle(PluginRequestsHandler.kt:48)
	at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.applyPluginsTo(KotlinScriptEvaluator.kt:202)
	at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.applyPluginsTo(Interpreter.kt:405)

问题分析

因为Android Studio不能下载依赖，需要设置代理，我在Android Studio中设置了socks代理。但是总是下载不成功，每次sync的时候都报错。我以为是gradle的网站出问题了，用浏览器直接访问是没问题的。后来想到了以前好像遇到类似的问题，Android Studio需要设置http代理。修改为http代理之后工程可以正常sync了。

解决方案

在Android Studio中设置http代理。