go get 撞墙了，在go get github.com/mattn/go-sqlite3 的时候，绕过一道墙，然后go get 里面还有git clone https://go.googlesource.com/net /Users/topcaver/code/go/src/golang.org/x/net 这样的操作……
Step 1: set git through socks5 proxy:
git config --global http.proxy socks5://127.0.0.1:7070
Step 2: go get via socks5 proxy:
http_proxy=socks5://127.0.0.1:7070 go get github.com/mattn/go-sqlite3
Recover git global config:
git config --global --unset http.proxy
ref:
https://stackoverflow.com/questions/10383299/how-do-i-configure-go-to-use-a-proxy https://stackoverflow.com/questions/128035/how-do-i-pull-from-a-git-repository-through-an-http-proxy/3406766#3406766