Github has opened a proxy, but push still cannot go up

Refer to the article
http://t.csdn.cn/GnEby
to record it, so as not to change it back in the future.
The first step:
first look at
git config --global http.proxy
git config --global https.proxy
If there is nothing, go directly to the third Step
2:
git config --global --unset http.proxy
git config --global --unset https.proxy
Step 3:
Reset proxy
git config --global https.proxy 127.0 .0.1:****
git config --global http.proxy 127.0.0.1:********
here is the port number, and the proxy is generally written, which can be 7890, etc.