Try setting variable named no_proxy in following manner
$ export no_proxy=localhost,127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
But if you do this in the command line, you will have to do it again each time you open a new terminal window. If you want those settings to be persistent, put this very command inside your .profile file
under $HOME (read this answer if you want to understand better what this .profile file is).