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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 and the proxy server evaluates the request as a way to simplify and control its complexity.Proxies were invented to add structure and encapsulation to distributed systems.For example, JPEG files could be blocked based on fleshtone matches, or language filters could dynamically detect unwanted language.If the content is rejected then an HTTP fetch error may be returned to the requester.Ironically, websites commonly used by students to circumvent filters and access blocked content often include a proxy, from which the user can then access the websites that the filter is trying to block.Requests may be filtered by several methods, such as a URL or DNS blacklists blacklist, URL regex filtering, MIME filtering, or content keyword filtering.There are several reasons for installing reverse proxy servers: A content-filtering web proxy server provides administrative control over the content that may be relayed in one or both directions through the proxy.It is commonly used in both commercial and non-commercial organizations (especially schools) to ensure that Internet usage conforms to acceptable use policy.

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Web proxies are the most common means of bypassing government censorship, although no more than 3% of Internet users use any circumvention tools.Some products have been known to employ content analysis techniques to look for traits commonly used by certain types of content providers.Blacklists are often provided and maintained by web-filtering companies, often grouped into categories (pornography, gambling, shopping, social networks, etc.).A reverse proxy (or surrogate) is a proxy server that appears to clients to be an ordinary server.Reverse proxies forward requests to one or more ordinary servers which handle the request.

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