go get报错：A connection attemp t failed because the connected party did not properly respond after a p

当我尝试执行go get -u github.com/go-sql-driver/mysql命令获取mysql的时候，报错了。

具体错误如下：

go get: module github.com/go-sql-driver/mysql: Get "https://proxy.golang.org/github.com/go-sql-driver/mysql/@v/list": dial tcp 172.217.24.17:443: connectex: A connection attemp
t 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.

具体原因：默认go的代理网站是GOPROXY=https://proxy.golang.org,direct，是一个外网地址，国内访问不到，因此我们需要修改代理网站。

解决：使用命令go env -w GOPROXY=https://goproxy.cn,direct更改代理网站，然后再重新执行go get命令即可成功download了。