运行 Go 报错：exercise-maps.go:4:2: cannot find package “code.google.com/p/go-tour/wc” in any of: c:\go\src\code.google.com\p\go-tour\wc (from $GOROOT) 的解决

1、查看 Go 文件：exercise-maps.go，代码如下

package main

import (
 "code.google.com/p/go-tour/wc"
)

func WordCount(s string) map[string]int {
 return map[string]int{"x": 1}
}

func main() {
 wc.Test(WordCount)
}

2、运行文件，Go 报错：exercise-maps.go:4:2: cannot find package “code.google.com/p/go-tour/wc” in any of:
c:\go\src\code.google.com\p\go-tour\wc (from $GOROOT)
C:\Users\Administrator\go\src\code.google.com\p\go-tour\wc (from $GOPATH)，如图1

PS E:\wwwroot\go\moretypes> go run exercise-maps.go
exercise-maps.go:4:2: cannot find package "code.google.com/p/go-tour/wc" in any of:
        c:\go\src\code.google.com\p\go-tour\wc (from $GOROOT)
        C:\Users\Administrator\go\src\code.google.com\p\go-tour\wc (from $GOPATH)

3、打开 Go Tour 在 GitHub 上的网址：https://github.com/golang/tour ，开启蓝灯连接后，基于源代码安装 Go Tour，报错：unrecognized import path “golang.org/x/tour”，Ping golang.org，提示请求超时，如图2

PS E:\wwwroot\go\moretypes> go get golang.org/x/tour
package golang.org/x/tour: unrecognized import path "golang.org/x/tour" (https fetch: Get https://golang.org/x/tour?go-g
et=1: dial tcp 216.239.37.1:443: connectex: A connection attempt failed because the connected party did not properly res
pond after a period of time, or established connection failed because connected host has failed to respond.)

4、在 Chrome 中打开网址：https://golang.org/ ，可以正常打开，如图3

5、利用蓝灯为命令行配置 HTTP 代理，查看蓝灯的高级设置 – HTTP(S)代理服务器，如图4

6、在 cmd 中设置两个环境变量 HTTP_PROXY 和 HTTPS_PROXY ，执行以下两个命令设置环境变量，完成配置，基于源代码安装 Go Tour，未报错，虽然仍然无法 Ping 通，但是可以通过 Curl 打开 www.google.com，表示 HTTP 代理已经设置成功，如图5

C:\Users\Administrator>set HTTP_PROXY=http://127.0.0.1:50999

C:\Users\Administrator>set HTTPS_PROXY=http://127.0.0.1:50999

C:\Users\Administrator>go get golang.org/x/tour

C:\Users\Administrator>ping golang.org

正在 Ping golang.org [216.239.37.1] 具有 32 字节的数据:
请求超时。
请求超时。
请求超时。
请求超时。

216.239.37.1 的 Ping 统计信息:
    数据包: 已发送 = 4，已接收 = 0，丢失 = 4 (100% 丢失)，

C:\Users\Administrator>curl -vv http://www.google.com
* Rebuilt URL to: http://www.google.com/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 50999 (#0)
> GET http://www.google.com/ HTTP/1.1
> Host: www.google.com
> User-Agent: curl/7.55.1
> Accept: */*
> Proxy-Connection: Keep-Alive
>
< HTTP/1.1 301 Moved Permanently
< Connection: close
< Cache-Control: max-age:86400
< Date: Friday, 27-Dec-19 16:57:05 CST
< Expires: Sat, 28 Dec 2019 16:57:05 GMT
< Keep-Alive: timeout=58
< Location: https://www.google.com/
< Content-Length: 0
<
* Closing connection 0

7、查看目录：C:\Users\Administrator\go\src\golang.org\x，目录：tour 已经存在，如图6

8、编辑 Go 文件：exercise-maps.go，将 code.google.com/p/go-tour 替换为：golang.org/x/tour，代码如下

package main

import (
 "golang.org/x/tour/wc"
)

func WordCount(s string) map[string]int {
 return map[string]int{"x": 1}
}

func main() {
 wc.Test(WordCount)
}

9、运行文件，正常运行，如图7

PS E:\wwwroot\go\moretypes> go run exercise-maps.go
FAIL
 f("I am learning Go!") =
  map[string]int{"x":1}
 want:
  map[string]int{"Go!":1, "I":1, "am":1, "learning":1}