Cannot add proxy exceptions on Ubuntu 15.04

Question

My machine sits behind office network proxy.

How can I add exception for certain hosts?

I have tried the solution given in Proxy exceptions in 12.04 LTS. In gconf-editor it does not show 'ignore_hosts' option.

Answer 1

The option is available via gconf-editor

or with dconf-editor

sudo apt-get install dconf-editor

or via your Network sessings

Answer 2

This option IS there. system -> proxy -> ignore-hosts