[sbt] How to use sbt from behind proxy?

In windows environment simply add following line in the sbt/sbtconfig.txt

-Dhttp.proxyHost=PROXYHOST 
-Dhttp.proxyPort=PROXYPORT 
-Dhttp.proxyUser=USERNAME 
-Dhttp.proxyPassword=XXXX

or the Https equivalent (thanks to comments)

-Dhttps.proxyHost=PROXYHOST 
-Dhttps.proxyPort=PROXYPORT 
-Dhttps.proxyUser=USERNAME 
-Dhttps.proxyPassword=XXXX