执行go get github.com/astaxie/beego时，出现的错误大致如下：
go get: module github.com/astaxie/beego: Get "https://proxy.golang.org/github.com/astaxie/beego/@v/list": dial tcp 172.217.163.49:443: 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.
出现如上现象大致就是网络问题，无法访问，解决方法如下：
运行cmd，执行如下代码：
go env -w GOPROXY=https://goproxy.cn,direct
再次执行go get github.com/astaxie/beego就可以了
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