Android Architecture Components 下载依赖失败

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最近想要研究####Android Architecture Components 奈何本地的gradle一直拉不下源码，尝试切换到云服务器编译，依然落不下代码提示错误

FAILURE: Build failed with an exception.* What went wrong:A problem occurred configuring project ':app'.> Could not resolve all dependencies for configuration ':app:_debugApkCopy'.   > Could not resolve android.arch.persistence.room:runtime:1.0.0-alpha3.     Required by:         project :app      > Could not resolve android.arch.persistence.room:runtime:1.0.0-alpha3.         > Could not get resource 'https://maven.google.com/android/arch/persistence/room/runtime/1.0.0-alpha3/runtime-1.0.0-alpha3.pom'.            > Could not HEAD 'https://maven.google.com/android/arch/persistence/room/runtime/1.0.0-alpha3/runtime-1.0.0-alpha3.pom'.               > Connect to maven.google.com:443 [maven.google.com/216.58.200.46] failed: Connection timed out: connect   > Could not resolve android.arch.lifecycle:common:1.0.0-alpha3.     Required by:         project :app > android.arch.lifecycle:runtime:1.0.0-alpha3         project :app > android.arch.lifecycle:extensions:1.0.0-alpha3      > Could not resolve android.arch.lifecycle:common:1.0.0-alpha3.         > Could not get resource 'https://maven.google.com/android/arch/lifecycle/common/1.0.0-alpha3/common-1.0.0-alpha3.pom'.            > Could not HEAD 'https://maven.google.com/android/arch/lifecycle/common/1.0.0-alpha3/common-1.0.0-alpha3.pom'.               > Connect to maven.google.com:443 [maven.google.com/216.58.200.46] failed: Connection timed out: connect

思来想去，还是没找到原因，本身网络是自带翻墙梯子的，后来看到很多人在Google issue提问题，也是无法下载依赖库
后来尝试翻看 https://developer.android.com/studio/build/dependencies.html 找到了答案，Google 建议将

将 https://maven.google.com
替换为 https://dl.google.com/dl/android/maven2/

答案解析 https://developer.android.com/studio/build/dependencies.html

repositories {    maven {        url 'https://maven.google.com'        // Alternative URL is 'https://dl.google.com/dl/android/maven2/'    }}

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