Why doesn't “go get gopkg.in/…” work while “go get github.com/…” OK?

Question

I try to use go get gopkg.in/fatih/pool.v2 to install pool according to Readme.md , but can't success:

C:\Users\xiaona\Documents\GitHub> go get -v gopkg.in/fatih/pool.v2
Fetching https://gopkg.in/fatih/pool.v2?go-get=1
https fetch failed.
Fetching http://gopkg.in/fatih/pool.v2?go-get=1
import "gopkg.in/fatih/pool.v2": http/https fetch: Get http://gopkg.in/fatih/poo
l.v2?go-get=1: dial tcp 107.178.216.236:80: ConnectEx tcp: A connection attempt
failed because the connected party did not properly respond after a period of ti
me, or established connection failed because connected host has failed to respon
d.
package gopkg.in/fatih/pool.v2: unrecognized import path "gopkg.in/fatih/pool.v2
"

While access 107.178.216.236:80 is OK in web browser.

I try to use go get github.com/fatih/pool , and it also works OK.

Could anyone give some clues on this issue?

BTW: I use windows powershell and git version is 1.9.5 .

Answer 1

The root cause has been found: Because my computer use a web proxy, so I need to set proxy in environment variable:

C:\Users\xiaona>set https_proxy=https://web-proxy.corp.hp.com:8080/

C:\Users\xiaona>set http_proxy=https://web-proxy.corp.hp.com:8080/

C:\Users\xiaona>go get -v gopkg.in/fatih/pool.v2
Fetching https://gopkg.in/fatih/pool.v2?go-get=1
Parsing meta tags from https://gopkg.in/fatih/pool.v2?go-get=1 (status code 200)

get "gopkg.in/fatih/pool.v2": found meta tag main.metaImport{Prefix:"gopkg.in/fa
tih/pool.v2", VCS:"git", RepoRoot:"https://gopkg.in/fatih/pool.v2"} at https://g
opkg.in/fatih/pool.v2?go-get=1
gopkg.in/fatih/pool.v2 (download)
gopkg.in/fatih/pool.v2

Then, all is OK!