Due to the dynamic increase in popularity of the World Wide Web, where client and proxies access resources on servers, internet traffic has grown significantly. Correspondingly , user perceived latency in retrieving web page has increased.
Caching at proxy servers is one of the ways to reduce the respond time perceived by web users. Cache replacement algorithms play a central role in the response time reduction by selecting a subset of documents for caching so that a given performance metric is maximized . Hence, proxy server is a server which can act on behalf of the server and improve the response time by forwarding the client request to the appropriate web server.
Many of the current firewall designs rely on the combination of packet filtering and technology. The solution for protecting your pc’s security and privacy by allowing to block potentially damaged sites.
Today, proxy systems can manage the different operations authorizations that users have when surfing (for example who is allowed to use which protocol), blocking unwanted surfers outside the local net from going in.
Today, everyone from smallest startup to General Motors has accessed to middleware application servers that provide high reliability, scalability, database access and connection pooling , space caching and supports open standards.