报错情况

下载gin包，报错如下：

unrecognized import path "golang.org/x/crypto/sha3": https fetch: Get "https://golang.org/x/crypto/sha3?go-get=1": dial tcp 216.239.37.1:443: 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.
unrecognized import path "google.golang.org/protobuf/encoding/prototext": https fetch: Get "https://google.golang.org/protobuf/encoding/prototext?go-get=1": dial tcp 216.239.37.1:443: 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.

如图：

解决方案

设置代理

cmd下输入：SET GO111MODULE=on

接着cmd输入:SET GOPROXY=https://goproxy.cn

这里参考的文章上是：

在代理链接外添加了双引号，但是事实上：

出现了转义

go get github.com/gin-gonic/gin: parse "\"https://goproxy.cn\"": first path segment in URL cannot contain colon

所以这里我们灵活修改为 SET GOPROXY=https://goproxy.cn

代理设置完成，成功下载

参考链接

• https://www.liwenzhou.com/posts/Go/fix_go_get/