本以为Visual Studio Code 安装Golang插件很容易，确实容易。但是安装Golang插件需要的插件却很麻烦。
譬如调试需要用dlv，visual studio code可以自动下载需要的插件，如下所示：
gocode
go-outline
go-symbols
guru
gorename
dlv
godef
goreturns
但是各种报错，信息如下：
Installing github.com/nsf/gocode FAILED
Installing github.com/ramya-rao-a/go-outline FAILED
Installing github.com/acroca/go-symbols FAILED
Installing golang.org/x/tools/cmd/guru FAILED
Installing github.com/golang/lint/golint FAILED
......
guru:
Error: Command failed: C:\Go\bin\go.exe get -u -v golang.org/x/tools/cmd/guru
Fetching https://golang.org/x/tools/cmd/guru?go-get=1
https fetch failed: Get https://golang.org/x/tools/cmd/guru?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.
golang.org\x\tools (download)
Fetching https://golang.org/x/tools/cmd/guru/serial?go-get=1
https fetch failed: Get https://golang.org/x/tools/cmd/guru/serial?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
......于是各种查找安装dlv失败的解决办法，网上说的很简单，都是通过如下命令：
go get -u github.com/derekparker/delve/cmd/dlv我兴致匆匆，以为马上可以解决，但是又报错
# github.com/derekparker/delve/pkg/config
F:\ProgramTest\Golang\src\github.com\derekparker\delve\pkg\config\config.go:137:
undefined: io.SeekStart
# github.com/derekparker/delve/pkg/dwarf/reader
F:\ProgramTest\Golang\src\github.com\derekparker\delve\pkg\dwarf\reader\variable
s.go:89: dwarf.Ranges undefined (type *dwarf.Data has no field or method Ranges,
but does have dwarf.ranges)看来是缺少相应的文件，其中，F:\ProgramTest\Golang是GOPATH变量值
继续找资料，发现了如下解决方法：
1. 在目录%GOPATH%\src\github.com下，执行：git clone https://github.com/golang/tools.git tools
2. 在下载完成后，在%GOPATH%\src\github.com\golang多了一个tools目录，将tools目录复制到%GOPATH%\src\golang.org\x\tools下，如果没有自行创建
3. 然后继续通过Visual Studio Code安装，提示如下
Installing github.com/nsf/gocode FAILED
Installing github.com/ramya-rao-a/go-outline SUCCEEDED
Installing github.com/acroca/go-symbols SUCCEEDED
Installing golang.org/x/tools/cmd/guru FAILED
Installing golang.org/x/tools/cmd/gorename SUCCEEDED
Installing github.com/derekparker/delve/cmd/dlv FAILED
Installing github.com/rogpeppe/godef FAILED
Installing github.com/sqs/goreturns FAILED
5 tools failed to install.其实还是可以安装成功几个的，失败原因也大致如下：
gocode:
Error: Command failed: C:\Go\bin\go.exe get -u -v github.com/nsf/gocode
github.com\nsf\gocode (download)
github.com/nsf/gocode
# github.com/nsf/gocode
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:99: r.declReader.Reset undefined (type bytes.Reader has no field or method Reset)
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:148: undefined: io.SeekCurrent
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:152: undefined: io.SeekCurrent
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:214: r.declReader.Reset undefined (type bytes.Reader has no field or method Reset)
github.com\nsf\gocode (download)
github.com/nsf/gocode
# github.com/nsf/gocode
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:99: r.declReader.Reset undefined (type bytes.Reader has no field or method Reset)
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:148: undefined: io.SeekCurrent
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:152: undefined: io.SeekCurrent
F:\ProgramTest\Golang\src\github.com\nsf\gocode\package_ibin.go:214: r.declReader.Reset undefined (type bytes.Reader has no field or method Reset)
guru:
Error: Command failed: C:\Go\bin\go.exe get -u -v golang.org/x/tools/cmd/guru
Fetching https://golang.org/x/tools/cmd/guru?go-get=1
https fetch failed: Get https://golang.org/x/tools/cmd/guru?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.
golang.org\x\tools (download)
Fetching https://golang.org/x/tools/cmd/guru/serial?go-get=1
https fetch failed: Get https://golang.org/x/tools/cmd/guru/serial?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/tools/go/ast/astutil?go-get=1
https fetch failed: Get https://golang.org/x/tools/go/ast/astutil?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/tools/go/buildutil?go-get=1
https fetch failed: Get https://golang.org/x/tools/go/buildutil?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.
4. 通过手动安装失败的插件，如gocode
在Visual Studio Code的右下角的TERMINAL栏（当前目录自动在%GOPATH%）执行如下命令
go get -u -v github.com/nsf/gocode依然报错：
github.com\nsf\gocode (download)
github.com/nsf/gocode
# github.com/nsf/gocode
src\github.com\nsf\gocode\package_ibin.go:99: r.declReader.Reset undefined (type bytes.Reader has no field or method Reset)
src\github.com\nsf\gocode\package_ibin.go:148: undefined: io.SeekCurrent
src\github.com\nsf\gocode\package_ibin.go:152: undefined: io.SeekCurrent
src\github.com\nsf\gocode\package_ibin.go:214: r.declReader.Reset undefined (type bytes.Reader has no field or method Reset)
说是缺少一些package，如io，r。于是到github上看issuse，也没有说有这类问题。
5. 继续查询，发现可能与go的版本号有关
通过go version查看版本号：go version go1.6 windows/amd64
这个版本号真的好低，赶紧更新为1.10版本，安装后信息如下：
go version go1.10.3 windows/amd64
6. 由于重新安装go，visual studio code检测到相关信息，因此主动更新之前安装的插件
7. 重新安装dlv等插件，安装结果如下
Installing github.com/mdempsky/gocode SUCCEEDED
Installing golang.org/x/tools/cmd/guru SUCCEEDED
Installing github.com/derekparker/delve/cmd/dlv SUCCEEDED
Installing github.com/rogpeppe/godef SUCCEEDED
Installing github.com/sqs/goreturns SUCCEEDED
Installing golang.org/x/lint/golint FAILED发现只有golint（检测代码中不规范的地方）安装失败，因为golang.org被墙，有些时候可以访问，有些时候不能。多试几次，并且dlv安装成功，可以调试程序了，golint对调试程序也没什么影响。
总结：go版本太低，导致安装golang插件一直失败，更新go版本即可解决。
参考资料