proxy server

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Related to Proxy Website: Anonymous surfing

proxy server

Computing a computer that acts as an intermediary between a client machine and a server, caching information to save access time
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

proxy server

[′präk·sē ‚sər·vər]
(computer science)
Software for caching and filtering Web content to reduce network traffic on intranets, and for increasing security by filtering content and restricting access.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Proxy Server

(software, security)
Microsoft's proxy server and proxy gateway, designed to provide extensible firewall and network security. Proxy Server is part of BackOffice.

proxy server

(programming, World-Wide Web)
A process providing a cache of items available on other servers which are presumably slower or more expensive to access.

This term is used particularly for a World-Wide Web server which accepts URLs with a special prefix. When it receives a request for such a URL, it strips off the prefix and looks for the resulting URL in its local cache. If found, it returns the document immediately, otherwise it fetches it from the remote server, saves a copy in the cache and returns it to the requester. The cache will usually have an expiry algorithm which flushes documents according to their age, size and access history.

Compare proxy gateway.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

proxy server

A proxy server is a computer system or router that functions as a relay between client and server. It helps prevent an attacker from invading a private network and is one of several tools used to build a firewall.

The word proxy means "to act on behalf of another," and a proxy server acts on behalf of the user. All requests to the Internet go to the proxy server first, which evaluates the request and forwards it to the Internet. Likewise, responses come back to the proxy server and then to the user.


Proxy Servers Provide Anonymity
Like a virtual private network (VPN), a proxy server hides the user's IP address when accessing the Internet. See VPN and TLS.







Address Translation and Caching
The proxy server is a dual-homed host with two network IP addresses. The address on the outbound side is the one the Internet sees. Proxies are often used in conjunction with network address translation (NAT), which hides the users' IP addresses on the internal network. Proxy servers may also cache Web pages so that the next request for that page can be retrieved much faster. See NAT and proxy cache.

Other Proxies
Anonymous proxy servers let users surf the Web and keep their IP address private (see anonymous proxy). Although not specifically called proxies, Internet email (SMTP) and the Usenet new system (NNTP) are somewhat similar because messages are relayed from sender to recipient. See firewall.

Application Level and Circuit Level
"Application-level" proxies or "application-level gateways" are dedicated to specific content such as HTTP (Web) and FTP (file transfer). In contrast, a "circuit-level" proxy supports every application (see SOCKS).

Forward and Reverse Proxies
In this definition, the proxy servers are "forward proxies" that hide the details of the clients from the servers. However, proxies can also reside at the website to hide details from the clients (see reverse proxy).


A Proxy Server in a LAN
In this example, the proxy server functions as a firewall in the public side of a company network, which is called the "demilitarized zone" (see DMZ).
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References in periodicals archive ?
The Association for Freedom of Thought and Expression (AFTE), an Egyptian non-governmental organization, which has been tracking affected sites, said the latest ban includes websites of two rights group and another 17 virtual private network and proxy websites. On May 24, Egypt's official media reported that the government ordered the blocking of access to 21 news websites, alleging they supported terrorism or reported false news.
The statement said the American psy-war program was called "Iran Proxy." That is, however, simply the term used by those who set up proxy websites outside Iran that Iranians can go to and then type in the addresses of websites they are barred from reaching by Iranian government filters.
In those countries it has blocked websites related to sex education and human-rights advocacy, as well as some newspapers and blogs and proxy websites that allow Internet users to browse anonymously, according to testing conducted by Open Net.
An FJWU student said that proxy websites were a staple among the students.
But the official admitted that despite the ban, several students continued to access Facebook and Twitter via proxy websites or on their own mobile devices.
These apps and many other used proxy websites in order to get past any local ISP blockades.
A British man accused of operating a number of proxy websites that made it possible for online pirates to visit blocked sites in the United Kingdom is facing five years in prison for his alleged crimes.
Ms Marri was of the view that YouTube was accessible through proxy websites and there was no point in maintaining the ban.
Farewell." All the proxy websites for the search engine are also down.
More than 768,264 URLs containing pornographic material, 31,963 URLs with 'blasphemous' content, 10,196 proxy websites, 4,799 'anti-state' websites, 3,719 'anti-judiciary' websites and some 1,00 sectarian and hate-speech sites, besides 850 defamatory sites, have been blocked in the country.
However, The Pirate Bay proxy websites and VPNs were working fine even when the main website was down.
TorrentFreak noted that users of websites like The Pirate Bay can use different IP addresses or proxy websites to access the website.