报错：
go get: module github.com/gin-gonic/gin: Get "https://proxy.golang.org/github.com/gin-gonic/gin/@v/list": dial tcp 172.217.160.81:443: 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.
原因：
墙
解决方法：
设置国内代理
go env -w GOPROXY=https://goproxy.cn
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