A proxy server is a server that connects to the Internet on behalf of a computer that can not directly connect to the Internet, and represents a server that act on behalf of access to a Web site, and a proxy mean substitute when translated into.
The corporate in-house LAN has a firewall setting to protect the connected computer from malicious external access, but in this state, since you can not access the website from the inside of the company, a proxy serve is putting on.
function
1. cache
2. filtering
3. ensure anonymity
