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proxy level

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In computer networks, a proxy server is a server (a computer system or an application program) which services the requests of its clients by making requests to other servers. A client connects to the proxy server, requesting a file, connection, web page, or other resource available from a different server. A proxy server provides the resource by connecting to the specified server, with some exceptions: A proxy server may alter the client's request or the server's response. A proxy server may service the request without contacting the specified server.

(A proxy server that passes all requests and replies unmodified is not called a proxy server. It is a gateway.)

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.

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