请忽略以下内容，现在（go 1.11+）请直接使用go mod，使用goproxy.cn、goproxy.io或者mirrors.aliyun.com/goproxy
由于国内连接不上golang.org ，当用go get安装有依赖golang.org的包时会报错Fetching https://golang.org/x，如果不用代理的话就需要手动下载了
PS E:\github.com> go get -v github.com/gohugoio/hugo
Fetching https://golang.org/x/net/idna?go-get=1
https fetch failed: Get https://golang.org/x/net/idna?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.
package golang.org/x/net/idna: unrecognized import path "golang.org/x/net/idna" (https fetch: Get https://golang.org/x/net/idna?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.)
Fetching https://golang.org/x/text/unicode/norm?go-get=1
https fetch failed: Get https://golang.org/x/text/unicode/norm?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.
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: 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.)
Fetching https://golang.org/x/text/width?go-get=1
https fetch failed: Get https://golang.org/x/text/width?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.
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: 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.)
Fetching https://golang.org/x/text/transform?go-get=1
https fetch failed: Get https://golang.org/x/text/transform?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.
package golang.org/x/text/transform: unrecognized import path "golang.org/x/text/transform" (https fetch: Get https://golang.org/x/text/transform?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.)
Fetching https://golang.org/x/image/bmp?go-get=1
https fetch failed: Get https://golang.org/x/image/bmp?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.
package golang.org/x/image/bmp: unrecognized import path "golang.org/x/image/bmp" (https fetch: Get https://golang.org/x/image/bmp?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.)
Fetching https://golang.org/x/image/tiff?go-get=1
https fetch failed: Get https://golang.org/x/image/tiff?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.
package golang.org/x/image/tiff: unrecognized import path "golang.org/x/image/tiff" (https fetch: Get https://golang.org/x/image/tiff?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.)
Fetching https://golang.org/x/image/draw?go-get=1
https fetch failed: Get https://golang.org/x/image/draw?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.
package golang.org/x/image/draw: unrecognized import path "golang.org/x/image/draw" (https fetch: Get https://golang.org/x/image/draw?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.)
Fetching https://golang.org/x/image/webp?go-get=1
https fetch failed: Get https://golang.org/x/image/webp?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.
package golang.org/x/image/webp: unrecognized import path "golang.org/x/image/webp" (https fetch: Get https://golang.org/x/image/webp?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.)
Fetching https://golang.org/x/net/context?go-get=1
https fetch failed: 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.
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.)
Fetching https://golang.org/x/sync/errgroup?go-get=1
https fetch failed: Get https://golang.org/x/sync/errgroup?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.
package golang.org/x/sync/errgroup: unrecognized import path "golang.org/x/sync/errgroup" (https fetch: Get https://golang.org/x/sync/errgroup?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.)
在$GOPATH/src路径下创建golang/x文件夹并下载想要的包，在windows下以上面报错为例。以上报错无法获取https://golang.org/x/nettextimagesync现在我们来手动获取
打开Git Bash
mkidr -p ~/go/src/golang.org/x
cd ~/go/src/golang.org/x
git clone https://github.com/golang/net.git
git clone https://github.com/golang/text.git
git clone https://github.com/golang/image.git
git clone https://github.com/golang/sync.git
这样我们再go get时就成功了