Unable to use proxy at sudo

The company's network connection to the extranet requires proxies, but it's strange that sudo users can't connect at any rate, but the root user can apt-get update

Just started to think it was a network connection problem, NAT, bridge for half a day
Later, according to Https://www.chenyudong.com/archives/sudo-keep-env.html
Just know

sudo when switching to root users, Env does not retain these environment variables, and needs to be specifically specified.

In/etc/sudoers, add under Env_reset
Defaults env_keep= "Http_proxy https_proxy ftp_proxy No_proxy
o:)