運行文件時報錯 verifying github.com/mattn/go-isatty@v0.0.10-0.20190818123653-bf9a1dea1961/go.mod: github.com/mattn/go-isatty@v0.0.10-0.20190818123653-bf9a1dea1961/go.mod: Get https://sum.golang.org/lookup/github.com/mattn/go-isatty@v0.0.10-0.20190818123653-bf9a1dea1961: dial tcp 216.58.200.49:443: 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.
verifying github.com/onsi/gomega@v1.8.1/go.mod: github.com/onsi/gomega@v1.8.1/go.mod: Get https://sum.golang.org/lookup/github.com/onsi/gomega@v1.8.1: dial tcp 216.58.200.49:443: 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.
verifying github.com/mattn/go-colorable@v0.1.3-0.20190818022642-388941e3ea99/go.mod: github.com/mattn/go-colorable@v0.1.3-0.20190818022642-388941e3ea99/go.mod: Get https://sum.golang.org/lookup/github.com/mattn/go-colorable@v0.1.3-0.20190818022642-388941e3ea99: dial tcp 216.58.200.49:443: 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.
在Go 1.13中，我們可以通過GOPROXY來控制代理
注意 ： 通過 GOPRIVATE 控制私有庫不走代理
這個網站是被牆了的，用於驗證包的有效性，可以通過如下命令關閉：
go env -w GOSUMDB=off
私有倉庫自動忽略驗證
可以設置 go env -w GOSUMDB="sum.golang.google.cn"， 這個是專門為國內提供的sum 驗證服務