how to you toggle on and off a web proxy in os x from the command line

Question

In OS X, you turn on and off a web proxy from System Preferences > Network > Proxies, by checking Web Proxy (HTTP) and designating the Web Proxy Server etc. and by clicking OK a

Answer 1

For an unauthenticated proxy (and assuming it's the Ethernet service you want to configure):

networksetup -setwebproxy Ethernet proxy.example.net 80 off

for authenticated:

networksetup -setwebproxy Ethernet proxy.example.net 80 on proxyuser "p4ssw0rd"

and to turn it off:

networksetup -setwebproxystate Ethernet off

If the network service isn't named just "Ethernet", you may need to parse networksetup -listallnetworkservices or -listnetworkserviceorder to get the correct name.