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In computer networks, a proxy server is a server (a computer system or an application program) which services the requests of its clients by forwarding requests to other servers. 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. The proxy server provides the resource by connecting to the specified server and requesting the service on behalf of the client. A proxy server may optionally alter the client's request or the server's response, and sometimes it may serve the request without contacting the specified server. In this case, it would 'cache' the first request to the remote server, so it could save the information for later, and make everything as fast as possible.

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Wikipedia about proxy server

Schematic%20Proxy%20Server.png

In computer networks, a proxy server is a server (a computer system or an application program) which services the requests of its clients by forwarding requests to other servers. 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. The proxy server provides the resource by connecting to the specified server and requesting the service on behalf of the client. A proxy server may optionally alter the client's request or the server's response, and sometimes it may serve the request without contacting the specified server. In this case, it would 'cache' the first request to the remote server, so it could save the information for later, and make everything as fast as possible.

A proxy server that passes all requests and replies unmodified is usually called a gateway or sometimes tunneling proxy.

A proxy server can be placed in the user's local computer or at specific key points between the user and the destination servers or the Internet.

Types and functions

Proxy servers implement one or more of the following functions:

Caching proxy server

A caching proxy server is the original proxy and can accelerate service requests by retrieving content saved from a previous request, made by the same client or even other clients. Caching proxies keep local copies of frequently requested resources, allowing large organizations to significantly reduce their upstream bandwidth usage and cost, while significantly increasing performance. Most ISP's and large businesses have a caching proxy. These machines are built to deliver superb file system performance (often with RAID and journaling) and also contain hot-rodded versions of TCP.

The HTTP 1.0 and later protocols contain many types of headers for declaring static (cacheable) content and verifying content freshness with an original server, e.g. ETAG (validation tags), If-Modified-Since (date-based validation), Expiry (timeout-based invalidation), etc. Other protocols such as DNS support expiry only and contain no support for validation.

Some poorly-implemented caching proxies have had downsides (e.g., an inability to use user authentication). Some problems are described in RFC 3143 (Known HTTP Proxy/Caching Problems).

Web proxy

A proxy that focuses on WWW traffic is called a "web proxy". The most common use of a web proxy is to serve as a web cache. Most proxy programs (e.g. Squid) provide a means to deny access to certain URLs in a blacklist, thus providing content filtering. This is usually used in a corporate environment, though with the increasing use of Linux in small businesses and homes, this function is no longer confined to large corporations. Some web proxies reformat web pages for a specific purpose or audience (e.g., cell phones and PDAs).

Search results for Proxy Server

ServerWatch Server Categories

... of servers reviewed on ... Server Directory (See a detailed list of all proxy servers. ... A reverse proxy stands in the way of servers within the ...www.serverwatch.com/stypes/index.php/cHJveHk=

MS Proxy Server Security Evaluation

... a recent study by Coopers & Lybrand LLP, Microsoft Proxy Server was deemed secure for many computing environments. This ... including Proxy Servers have been ...www.microsoft.com/technet/archive/proxy/prxsecwp.mspx

Proxy.org - The Proxy Authority

... HTTP or SOCKS type proxy servers that are accidently or ... proxy server so the machine can be exploited to launch further attacks on other machines. ...proxy.org/

proxy: Definition from Answers.com

proxy n. , pl. -ies . A person authorized to act for another; an agent or substitute. ... as a relay between client and server, proxy servers help prevent an attacker ...www.answers.com/topic/proxy

Proxy server - Simple English Wikipedia, the free encyclopedia

Proxy servers get their name because they act like a proxy (a stand-in) of the server computer. ... Caching proxy servers reduce the work load of the remote server. ...simple.wikipedia.org/wiki/Proxy_server

Images found for Proxy Server

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News about Proxy Server

Virginia High Court Wrong About IP Addresses

SlashdotFrequent Slashdot contributor Bennett Haselton writes "The Virginia Supreme Court has ruled that the state's anti-spam law, which prohibits the sending of bulk e-mail using falsified or forged headers, violates the First Amendment because it also applies to non-commercial political or religious speech. I agree that an anti-spam law should not outlaw anonymous non-commercial speech. But the ...http://news.slashdot.org/article.pl?sid=08/10/01/1526235&fro...

PocketSurfer offers unlimited browsing for £60

VNU Net via Yahoo! UK & Ireland NewsDatawind has unveiled a new version of its PocketSurfer mobile internet device with the option of unlimited web access for a £60 fee.http://uk.news.yahoo.com/vdunet/20081001/ttc-pocketsurfer-of...

Microsoft Managed Services Engine How To: Virtualize Your SOA

Enterprise IT PlanetUse the Microsoft Managed Services Engine to manage the changes in your SOA. http://redir.internet.com/rss/click/www.enterpriseitplanet.c...

PocketSurfer offers unlimited browsing for £60

InfomaticsDatawind has unveiled a new version of its PocketSurfer mobile internet device with the option of unlimited web access for a £60 fee. The PocketSurfer2R, available from late October, is the third generation of the pocket-sized clamshell device which opens up to reveal a Qwerty keyboard and 640 x 240 screen.http://www.infomaticsonline.co.uk/vnunet/news/2227280/pocket...

PocketSurfer offers unlimited browsing for £60

vnunet.com Daniel Robinson, Datawind has unveiled a new version of its PocketSurfer mobile internet device with the option of unlimited web access for a £60 fee.... http://feeds.vnunet.com/c/554/f/7147/s/20355cc/l/0L0Svnunet0...

News about Proxy Server

Palin email hacker pleads innocence, gets court date

TG DailyThe FBI found Kernell by tracing proxy server logs back to Kernell’s apartment. Apparently Kernell has a history of hacking into other computers, according to a recent NetworkingWorld article. His seventh grade history teacher, Tracey McDaniels ... http://www.tgdaily.com/content/view/39668/108/

News - Politics and Law

CNET NewsThe government, having a law against any opposition, tries to identify the source of the negative articles but the articles having been published via a proxy server, is unable to do so protecting the anonymity of the author. That document was provided ... http://news.cnet.com/8300-13578_3-38.html?keyword=%22NSA%22

Lawmaker’s son arrested and indicted over Palin’s hacked email ...

TG Daily ... thus providing access to the account by others.” The case is being investigated by the FBI’s Anchorage and Knoxville field offices, a statement released by the Department of Justice said. Apparently, Kernell was found through a proxy server email ... http://www.tgdaily.com/content/view/39648/118/

Jentro Technologies and Bouygues Telecom Announce WAP Agreement to ...

ForbesThe proxy is ad-server agnostic, thus allowing for multiple ad-servers to be installed for each solution or region to ensure the highest levels of sell through and to provide advertisers with the option to use their traditional agency relationships ... http://www.forbes.com/businesswire/feeds/businesswire/2008/1...

BBC iPlayer: An American Perspective

Newteevee.comBut if you’re a fan of British television, it’s definitely well worth the effort to locate a proxy server instead of relying on torrents (something I’ll be looking into upon my return to California). I sampled about three or four programs in the ... http://newteevee.com/2008/10/06/bbc-iplayer-an-american-pers...

Search results for Proxy Server

IRC Proxy Server - Fast Fresh Proxy Search & Leech tool

IRC Proxy Search - Fast leech thousands of fresh proxy server addresses in 1 minutes. Also offer new working HTTP Socks proxies finder.http://www.proxy-tool.com/irc-proxy-search.html

What is proxy server? - A Word Definition From the Webopedia Computer ...

This page describes the term proxy server and lists other pages on the Web where you can find additional information.http://www.webopedia.com/term/p/proxy_server.html

Proxy Server For E-Resources

library catalogs online research resources library services library help site map/search home : proxy server for e-resourceshttp://www.library.uiuc.edu/proxy/

Squid Web Proxy Cache

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. ... Squid has extensive access controls and makes a great server accelerator.http://www.squid-cache.org/

YouHide.com - Anonymous Proxy Server

About us What is an Anonymous Proxy Server? Anonymous proxy server is a routing communications between your computer and the Internet that can hide or mask your unique address to ... http://youhide.com/
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Videos found for Proxy Server

Biovail Proxy Fight

Biovail Proxy FightBiovail's founder and former chairman & CEO Eugene Melnyk wants current management out, with CNBC's Charlie Gasparino.Windows Media - Video

Investigators: Stalking By Proxy?

Investigators: Stalking By Proxy?There are many men in Minnesota prisons who claim they're really innocent of the crimes they were convicted of. Thomas Evenstad, the man you're about to meet, is one...Video - Video

Icahn to Launch Proxy Battle Agains...

Icahn to Launch Proxy Battle Against Yahoo - videoBillionaire activist investor Carl Icahn has confirmed he is launching a proxy battle to remove... 5/2008 APWindows Media - Video

Bypassing blocked sites using proxy

Bypassing blocked sites using proxyBypassing blocked siteMPEG 4 - Video

Exxon Proxy Fight Grows Pt. 2

Exxon Proxy Fight Grows Pt. 2Exxon Proxy Fight Grows Pt. 2Flash - Video

Videos found for Proxy Server

murderinthestacks.mpg

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ADVERTISE: Bulk Email Software - ML...

ADVERTISE: Bulk Email Software - MLM - Multi Level Marketing Advertisement...ADVERTISE: Bulk Email Software - MLM - Multi Level Marketing Advertisement! mailinglistmaster.com 20 min 15 sec - Oct 25, 2006 For anonymity emails are sent out through open proxy servers making you...flash: 0 MB w:320px - h:240px

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3_4_a_7a.swfTCP/IP(1) TCP/IP(2) DNS Router Proxy Server Firewall Chapter 3.4(II) 中文版本 Handout (1)flash: 0.2 MB w:550px - h:400px

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Answers for Proxy Server

yours_sivasiva

how to avoid the logging by proxy server?

yours_sivasivahi my friend this is the best answer for you question the best way for using proxy server and surf hidely your have to go to surfannoymously websites and the one which i trusted and think it is th...
b_j_sanchez

How can I use a proxy server to view movies on netflix.com from Mexico?

b_j_sanchezhttp://a.mesocancer.info -Let's you login Facebook (Writte on walls, comments, reply to messages and more!) -watch youtube videos -download up to 100 MB Compatible with -Facebook, -friends...
weberliner

How do I get access to and use a proxy server?

weberlinercontact your ssystem administrator, he/she may know of anonymous sites you can bounce through
Mike

How can I run Java applets that our corporate proxy server are blocking? Is there workaround?

MikeYea... i don't think there'd really be a way around this unless some how you could use a different proxy server outside of your work but then this too would be blocked by most smart network engineers....
Abdul Hameed

What is the difference between a normal server and proxy server.?

Abdul HameedThere's no such thing as a normal server, servers are just computers, the difference is in the functions they serve. A proxy server is simply a server that receives requests from clients (most of t...

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