How does proxy server work?
The proxy server acts as both a server system and a client system. It is a server when accepting HTTP requests from browsers, and acts as a client system when its browser software connects to remote servers to retrieve documents. The proxy server uses the header fields passed to it by the browser without modification when it connects to the remote server. This means the browser does not lose any functionality when going through a proxy. A complete proxy server should be able to communicate all the Web protocols, the most important ones being HTTP, FTP, Gopher, and WAIS. Proxies that handle only a single Internet protocol, such as HTTP, are possible, but a Web browser would then require access to other proxy servers to handle the remaining protocols. When a browser sends a request through a proxy server, the browser always uses HTTP for the transactions with the proxy server. This is true even when the user wants to access a remote server that uses another protocol; for example, FTP. In
