下载golang依赖异常解决
go modules项目执行go build时异常：
main.go:11:2: module github.com/astaxie/beego: Get "https://proxy.golang.org/github.com/astaxie/beego/@v/list": dial tcp 216.58.200.49:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
models\task_log.go:12:2: module github.com/astaxie/beego/cache: Get "https://proxy.golang.org/github.com/astaxie/beego/cache/@v/list": dial tcp 216.58.200.49:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
jobs\job.go:14:2: module github.com/astaxie/beego/logs: Get "https://proxy.golang.org/github.com/astaxie/beego/logs/@v/list": dial tcp 216.58.200.49:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
可以看出上面的异常是应为https://proxy.golang.org无法访问。
从 Go 1.11 版本开始，官方支持了 go module 包依赖管理工具。
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。
使用go env可以看到，默认的GOPROXY的值是https://proxy.golang.org。
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 https://goproxy.io ， 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=https://goproxy.io
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