I believe the convention for `no_proxy` is a trailing match. `no_proxy=github.com` should probably match `www.github.com`. I tip I got from a friend was that you could easily build a single regex combining all the `no_proxy` elements like `/(github.com|google.com)$/i`. Also don't strip the `.` prefix.

See http://lynx.isc.org/lynx2.8.6/lynx2-8-6/lynx_help/keystrokes/environments.html