下载

go get -u github.com/gin-gonic/gin

报错

go get: module github.com/gin-gonic/gin: Get "https://proxy.golang.org/github.com/gin-gonic/gin/@v/list": dial tcp 172.217.160.113:443: 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.

解决方案

go env -w GO111MODULE=on

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

go get -u github.com/gin-gonic/gin

下载成功