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18. Server Software > Proxy Servers

Proxy Servers

Proxy servers are usually set up at the interface between a large organization and the rest of the Internet, both for security and performance reasons. The main idea behind using a proxy for security is that there will be no direct connections between the Internet and the internal network; when an HTTP request goes out, the proxy intercepts it and makes the request on behalf of the internal user. Or if the proxy already has the page in its cache, the cache will simply return the page to the internal user without ever touching the Internet.

If the page requested is not in the proxy’s cache, then the request will be significantly slower because of the extra step of intercepting the request and copying it back from the proxy to the client. On the other hand, for all subsequent accesses, access will be far faster because the page is close at hand.


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