gsettings set org.gnome.system.proxy mode 'none'
gsettings set org.gnome.system.proxy mode 'manual'
gsettings set org.gnome.system.proxy.http port 8080
gsettings set org.gnome.system.proxy.http host 0.0.0.0
gsettings set org.gnome.system.proxy.https port 8080
gsettings set org.gnome.system.proxy.https host 0.0.0.0
gsettings set org.gnome.system.proxy ignore-hosts "['']"