go get安装遇到的问题

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: i/o timeout)
package golang.org/x/net/webdav: unrecognized import path "golang.org/x/net/webdav" (https fetch: Get https://golang.org/x/net/webdav?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)

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

package golang.org/x/sys/unix: unrecognized import path "golang.org/x/sys/unix" (https fetch: Get https://golang.org/x/sys/unix?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)

cd golang.org/x
git clone https://github.com/golang/sys sys

package golang.org/x/text/secure/bidirule: unrecognized import path "golang.org/x/text/secure/bidirule" (https fetch: Get https://golang.org/x/text/secure/bidirule?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
package golang.org/x/text/unicode/bidi: unrecognized import path "golang.org/x/text/unicode/bidi" (https fetch: Get https://golang.org/x/text/unicode/bidi?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
package golang.org/x/text/unicode/norm: unrecognized import path "golang.org/x/text/unicode/norm" (https fetch: Get https://golang.org/x/text/unicode/norm?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
package golang.org/x/text/width: unrecognized import path "golang.org/x/text/width" (https fetch: Get https://golang.org/x/text/width?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
package golang.org/x/tools/go/loader: unrecognized import path "golang.org/x/tools/go/loader" (https fetch: Get https://golang.org/x/tools/go/loader?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)

git clone https://github.com/golang/text

package golang.org/x/tools/go/loader: unrecognized import path "golang.org/x/tools/go/loader" (https fetch: Get https://golang.org/x/tools/go/loader?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)