Unknown proxy Servers
Anonymity : Proxy Servers
Web proxy: Proxies that focus on WWW traffic are called web proxies. Many web proxies attempt to block offensive web content. Other web proxies reformat web pages for a specific purpose or audience. Network operators can also deploy proxies to intercept computer viruses and other hostile content served from remote web pages. Many organizations – including families, schools, corporations, and countries – use proxy servers to enforce acceptable network use policies or to provide security, anti-malware and/or caching services. A traditional web proxy is not transparent to the client application, which must be configured to use the proxy. In some cases, where alternative means of connection to the Internet are available, the user may be able to avoid policy control by simply resetting the client configuration and bypassing the proxy. Furthermore administration of browser configuration can be a burden for network administrators.
Security: A proxy server is an additional layer of defense and therefore protects the web servers further up the chain.
Encryption / SSL acceleration: when secure web sites are created, the SSL encryption is often not done by the web server itself, but by a reverse proxy that is equipped with SSL acceleration hardware. See Secure Sockets Layer.
Load balancing: The reverse proxy can distribute the load to several web servers, each web server serving its own application area. In such a case, the reverse proxy may need to rewrite the URLs in each web page (translation from externally known URLs to the internal locations).
Serve/cache static content: A reverse proxy can offload the web servers by caching static content like pictures and other static graphical content.
Compression: The proxy server can optimize and compress the content to speed up the load time.
Spoon feeding: Reduces resource usage caused by slow clients on the web servers by caching the content the web server sent and slowly "spoon feeds" it to the client. This especially benefits dynamically generated pages.