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

Just the Toggling :)

networksetup -setwebproxystate  
networksetup -setsecurewebproxystate  

Example :

networksetup -setwebproxystate  Wi-Fi on
networksetup -setsecurewebproxystate  Wi-Fi on

To handle the Modification alert : prefix sudo like

sudo networksetup -setwebproxystate  Wi-Fi on
sudo networksetup -setsecurewebproxystate  Wi-Fi on