用 go get 导包，拉取go第三方扩展包的时候报如下错误：
dial tcp 34.64.4.113:443: 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.
解决办法：
1.查看 GOSUMDB 的配置
最后是因为：set GOSUMDB=sum.golang.org
2.关掉GOSUMDB
go env -w GOSUMDB=off
3.配置代理
go env -w GOPROXY=https://goproxy.cn,direct
再次导包，依赖下载成功~
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