go get报错unrecognized import path “golang.org/x/net/context”…

今天安装gin框架，首先下载gin，命令如下：
go get github.com/mattn/go-sqlite3

结果报错:

package golang.org/x/net/context: unrecognized import path "golang.org/x/net/context" (https fetch: Get https://golang.org/x/net/context?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.)

操作的办法就是：

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$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

安装了这个net包，然后再去安装go-sqlite3，就安装成功了。