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TCP/IP Application Layer Addressing: Uniform Resource Identifiers, Locators and Names (URIs, URLs and URNs)
The Internet consists of millions
of interconnected servers, each of which is capable of providing useful
information to Internet users who request it. The more information a
network has, the richer it is, but the more difficult it becomes to
locate. In order to use information, we need to be able to find it,
and that requires at a minimum that we employ some means for labeling
each file or object.
For this purpose, TCP/IP has defined
a system of Uniform Resource Identifiers (URIs) that can be used
both on the Internet and on private TCP/IP networks. Each URI uniquely
specifies how a client can locate a particular resource and access it
so it can be used. URIs are subdivided into Uniform Resource Locators
(URLs) and Uniform Resource Names (URNs), which serve a similar
purpose but work in different ways.
In this section I describe the system
of addressing used on the Internet to identify files, objects and resources.
I begin with an overview, which introduces the concept of Uniform Resource
Identifiers (URIs), and explains the differences between URIs, URLs
and URNs. At the present time, URLs are used much more often than URNs.
Therefore, I have included a full subsection with several topics that
cover in detail the syntax of URLs, as well as important issues related
to how they are used. I also have a summary topic that gives a summary
overview of URNs and their role in Internet addressing.
Quick navigation to subsections and regular topics in this section
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.
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