dial tcp 216.58.200.49:443: connectex: A connection attempt failed because the connected party did

1. go build, 提示以下错误：

 github.com/alecthomas/[email protected]: Get "https://proxy.golang.org/github.com/alecthomas/template/@v/v0.0.0-20190718012654-fb15b899a751.mod": 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.

2. 原以为是这个模块找不到，所以 在go mod 文件里，删除了报错的这一行，再次 go build， 还是同样的错误，只是模块名称不一样，这才意识到是代理地址的问题，不是模块找不到的问题

3. go  env

 

发现是 set GOPROXY=https://proxy.golang.org,direct， 换成淘宝的地址，

set GOPROXY=https://mirrors.aliyun.com/goproxy/

再次 go build就不报错了。