dep ensure -update等相关指令，速度很慢，甚至出现网络连接问题，请问如何解决
Solving failure: No versions of github.com/mattn/go-isatty met constraints:
v0.0.3: unable to deduce repository and source type for "golang.org/x/sys/unix": unable to read metadata: unable to fetch raw metadata: failed HT
TP request to URL "http://golang.org/x/sys/unix?go-get=1": Get http://golang.org/x/sys/unix?go-get=1: dial tcp 216.239.37.1:80: connectex: A connection a
ttempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has fa
iled to respond.
有疑问加站长微信联系（非本文作者）
挂代理
http://golang.org/ 被墙乐
挂代理也慢。不知道为啥
用 govendor 可以提取本地包到 vendor 目录中，先用 golangtc 提供的下载页面下载。