解决方法：
**

go env -w GOPROXY=https://goproxy.cn

**

情景描述：

运行网站main的时候出现错误：
go run main.go

报错：

src\controller\home.go:3:8: no required module provides package github.com/teambition/gear;
to add it:
go get github.com/teambition/gear

输入命令之后会卡顿一会儿，然后返回：

go: module github.com/teambition/gear: Get “https://proxy.golang.org/github.com/teambition/gear/@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.

明显是无法访问go服务器，一般可以用开头给出的命令设置一下即可：
go env -w GOPROXY=https://goproxy.cn
go get github.com/teambition/gear
搞定！