NOTICE: Citizendium is still being set up on its newer server, treat as a beta for now; please see here for more.
Citizendium - a community developing a quality comprehensive compendium of knowledge, online and free. Click here to join and contribute—free
CZ thanks our previous donors. Donate here. Treasurer's Financial Report -- Thanks to our content contributors. --

Uniform Resource Locator

From Citizendium, the Citizens' Compendium
(Redirected from URL)
Jump to: navigation, search
This article is a stub and thus not approved.
Main Article
Definition [?]
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
This editable Main Article is under development and not meant to be cited; by editing it you can help to improve it towards a future approved, citable version. These unapproved articles are subject to a disclaimer.

Most commonly used to find resources on the World Wide Web, but much more general in capability, a Uniform Resource Locator (URL). Their syntax is:


A URL contains the name of the scheme being used (<scheme>) followed by a colon and then a string (the <scheme-specific-part>) whose interpretation depends on the scheme. [1]

Representative schemes

Primary WWW usage

Most often, URLs use a scheme of http to refer to the Hypertext Transfer Protocol as the scheme, and a fully qualified Domain Name System (DNS) name as the locator.

commonly refers to a link on the World Wide Web. URLs usually start with http://, e.g. this page's URL is In this example, the is a DNS name.

Direct IP protocol request



  1. Berners-Lee T, Masinter L, McCahill M (December 1994), Uniform Resource Locators (URL), RFC 1738