Glossary - U
- the operating system of choice for the Internet community at large,
and the Web community, too, UNIX offers the broadest range of tools,
utilities, and programming libraries for Web server use.
- UNIX shell
- the name of the command-line program used to manage user-computer
interaction, the shell can also be used to write CGI scripts and other
kinds of useful programs for UNIX.
- URI (Uniform Resource Identifier)
- any of a class of objects that identify resources available to the
Web; both URLs and URNs are instances of URIs.
- URL (Uniform Resource Locator)
- the primary naming scheme used to identify Web resources, URLs define
the protocols to be used, the domain name of the Web server where a resource
resides, the port address to be used for communication, and the directory
path to access a named Web file or resource.
- URL-encoded text
- a method for passing information requests and URL specification to Web
servers from browsers, URL encoding replaces spaces with plus signs (+) and
substitutes special hex codes for a range of otherwise unreproduceable
characters. This method is used to pass document queries from browsers to
servers (for the details, please consult Chapter 15).
- URN (Uniform Resource Name)
- a permanent, unchanging name for a Web resource, URNs are seldom used
in today's Web environment. They do, however, present a method guaranteed
to obtain access to a resource, as soon as the URN can be fully resolved
(it sometimes consists of human or organizational contact information,
rather than resource location data).
- an Internet protocol and service that provides access to a vast array
of named newsgroups, where users congregate to exchange information and
materials related to specific topics or concerns.
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