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Xanda - /dev/project - HOWTO Page on Proxy

In computer networks, a proxy server is a server (a computer system or an application program) which services the requests of its clients by forwarding requests to other servers. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource, available from a different server. The proxy server provides the resource by connecting to the specified server and requesting the service on behalf of the client. A proxy server may optionally alter the client's request or the server's response, and sometimes it may serve the request without contacting the specified server.

A proxy server that passes all requests and replies unmodified is usually called a gateway or sometimes tunnelling proxy.

A proxy server can be placed in the user's local computer or at specific key points between the user and the destination servers or the Internet.