The idea of proxy it is used with reference to the agent that is authorized to perform an action on behalf of another entity . The term is often used in the field of computing to allude to server which, in a network, acts as intermediary when a client requests resources from a server.
He proxy server , Or simply proxy , allows to register and control the traffic , ensures that communication is anonymous and helps optimize performance, for example. In some cases, however, the use of a proxy is considered illegitimate.
A proxy, in short, is a mediator or a link. Suppose a computer TO you need to request a resource from a team C . If you do it through a server B , this is responsible for transferring the request to C , With which C does not record that the original request was based on TO . As you can see as stated above, in this case the server B is the proxy server .
In practice the proxy is dedicated to intercepting the connections that are made from a client to a destination server. When browsing the world Wide Web , in this frame, the web proxy .
The proxy, in turn, can be local (the client who makes the request seeks the interception, thus allowing the establishment of filtering standards) or external (The proxy implementation is decided by an outside entity).
The notion of proxy is also used in other contexts. A climate proxy , also called paleoclimatic indicator , is a registry of biophysical peculiarities of the past that is intended for the measurement of meteorological conditions and thus serves for the reconstruction of the climatic characteristics of historical moments.
A proxy variable finally it is a statistical variable to which no interest is attributed to itself, but is important in making it possible to obtain others of greater interest through a correlation With the inferred value.