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A proxy service is an intermediary role played by software or a dedicated computer system between an endpoint device and a client which is requesting the service. The proxy service enables the client to connect to a different server and provides easy access to services like web pages, connections or files.
Proxy have two main purposes: to improve performance and to filter requests.
A purpose of a proxy service is to boost the performance of the system. Proxy servers can dramatically improve performance for groups of users. This is because it saves the results of all requests for a certain amount of time. A proxy service works simply – when a proxy service receives a request, for example, to open a Web page, it looks for the already cached pages. If it finds the requested page in the already cached page, it returns it to the user. If the page is not yet cached, proxy service uses its own IP address to fetch the page from the server for the client.
Proxy can also be used to filter requests to ensure that no dangerous traffic creeps in by applying strict routing rules. A company might use a proxy server to prevent its employees from accessing a specific set of Web sites.
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