go get unrecognized import path "golang.org/x/net"

报错信息

$ go get golang.org/x/net/websocket
unrecognized import path "golang.org/x/net/websocket": https fetch: Get "https://golang.org/x/net/websocket?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 get 中撞墙，即便挂着vpn仍然无法下载

尝试过 go get层面增加代理也没能解决（本身代理地址是阿里云镜像）

go 1.11版本新增了 GOPROXY 环境变量，go get会根据这个环境变量来决定去哪里取引入库的代码

$ export GOPROXY=https://goproxy.io

最终解决方案

$mkdir -p $GOPATH/src/golang.org/x/
$cd $GOPATH/src/golang.org/x/
$git clone https://github.com/golang/net.git net 
$go install net

手动克隆库到本地环境
再执行go get 安装（如： go get golang.org/x/net/websocket）
即可安装成功