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go moudle 为golang的一种包管理方式；而对于在国内使用，很多外网的包可能会无法使用，遂做一个记录；

报错信息：

go: golang.org/x/crypto@v0.0.0-20190701094942-4def268fd1a4: unrecognized import path "golang.org/x/crypto" (https fetch: Get https://golang.org/x/crypto?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.)go: golang.org/x/sys@v0.0.0-20190813064441-fde4db37ae7a: unrecognized import path "golang.org/x/sys" (https fetch: Get https://golang.org/x/sys?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.)go: golang.org/x/sys@v0.0.0-20190222072716-a9d3bda3a223: unrecognized import path "golang.org/x/sys" (https fetch: Get https://golang.org/x/sys?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.)

对于golang.org/x/**下的包，由于墙的原因，无法更新；解决方案如下：

go mod edit -require=golang.org/x/***@v0.0.0go mod edit -replace=golang.org/x/***@v0.0.0=github.com/golang/***@latest

方法1设置后，go.mod文件中显示如下：

go 1.12require golang.org/x/*** v0.0.0replace golang.org/x/*** v0.0.0 => github.com/golang/*** latest

方法2：

go env -w GOPROXY=https://goproxy.io,direct# 设置不走 proxy 的私有仓库，多个用逗号相隔go env -w GOPRIVATE=*.corp.example.com