问题描述
当我们使用 go get、go install、go mod 等命令时，会自动下载相应的包或依赖包。但由于众所周知的原因，类似于 golang.org/x/… 的包会出现下载失败的情况。如下所示：
$ go get -u golang.org/x/sys go get golang.org/x/sys: unrecognized import path "golang.org/x/sys" (https fetch: Get dial tcp 216.239.37.1:443: i/o timeout)
解决方式
那我们该如何解决问题呢？毕竟还要制造 bug 的嘛~
手动下载
我们常见的 golang.org/x/… 包，一般在 git Hub 上都有官方的镜像仓库对应。比如 golang.org/x/text 对应 github.com/golang/text。所以，我们可以手动下载或 clone 对应的 GitHub 仓库到指定的目录下。
mkdir $GOPATH/src/golang.org/x
cd $GOPATH/src/golang.org/x
git clone git@github.com:golang/text.git
rm -rf text/.git
当如果需要指定版本的时候，该方法就无解了，因为 GitHub 上的镜像仓库多数都没有 tag。并且，手动嘛，程序员怎么能干呢，尤其是依赖的依赖，太多了。
设置代理
如果你 有代理 ，那么可以设置对应的 环境变量 ：
export http_proxy= export https_proxy=
或者，直接用 all_proxy：
export all_proxy=
go mod replace
从 Go 1.11 版本开始，新增支持了 go modules 用于解决包依赖管理问题。该工具提供了 replace，就是为了解决包的别名问题，也能替我们解决 golang.org/x 无法下载的的问题。
go module 被集成到原生的 go mod 命令中，但是如果你的代码库在 $GOPATH 中，module 功能是默认不会开启的，想要开启也非常简单，通过一个环境变量即可开启 export GO111MODULE=on。
以下为参考示例：
module example.com/hello require ( golang.org/x/text v0.3.0 ) replace ( golang.org/x/text => github.com/golang/text v0.3.0 )
类似的还有 glide、gopm 等这类第三方包管理工具，都不同方式的解决方案提供给我们。
GOPROXY 环境变量
终于到了本文的终极大杀器 —— GOPROXY 。
我们知道从 Go 1.11 版本开始，官方支持了 go module 包依赖管理工具。
其实还新增了 GOPROXY 环境变量。如果设置了该变量，下载源代码时将会通过这个环境变量设置的代理地址，而不再是以前的直接从代码库下载。这无疑对我等无法科学上网的开发良民来说是最大的福音。
更可喜的是，goproxy.io 这个 开源项目 帮我们实现好了我们想要的。该项目允许开发者一键构建自己的 GOPROXY 代理服务。同时，也提供了公用的代理服务 ，我们只需设置该环境变量即可正常下载被墙的源码包了：
export GOPROXY=
不过， 需要依赖于 go module 功能 。可通过 export GO111MODULE=on 开启 MODULE。
如果项目不在 GOPATH 中，则无法使用 go get …，但可以使用 go mod … 相关命令。
也可以通过置空这个环境变量来关闭，export GOPROXY=。
对于 Windows 用户，可以在 PowerShell 中设置：
$env:GOPROXY = ""
最后，我们当然推荐使用 GOPROXY 这个环境变量的解决方式，前提是 Go version >= 1.11 。
参考资料
- goproxy.io for Go modules（）
- goproxy.io（）
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