how to use internet and apt with a authentification proxy with a A20 micro

[Nicoohunter]

Hello,
It's my first time using a A20 MICRO and I can't find how to use internet or the apt commands with my proxy who need an authentification . I am using a Debian 8 jessie image with my board, the one that is provided on the wiki page. Can sommeone help me configure my A20 micro to be able to use internet with my proxy ?

[Gerrit]

Some ways to set a proxy on debian

https://codepoets.co.uk/2014/debian-http_proxy-setting/