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Information about Url

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Uniform Resource Locator (URL) formerly known as Universal Resource Locator, is a technical, Web-related term used in two distinct meanings:
  • In popular usage, many technical documents, it is a synonym for Uniform Resource Identifier (URI);
  • Strictly, the idea of a uniform syntax for global identifiers of network-retrievable documents was the core idea of the World Wide Web. In the early times, these identifiers were variously called "document names", "Web addresses" and "Uniform Resource Locators". These names were misleading, however, because not all identifiers were locators, and even for those that were, this was not their defining characteristic. Nevertheless, by the time the RFC 1630 formally defined the term "URI" as a generic term best suited to the concept, the term "URL" had gained widespread popularity, which has continued to this day.

URI/URL syntax in brief

Main article: URI scheme#Generic syntax
Every URI (and therefore every URL) begins with the scheme name that defines its namespace, purpose, and the syntax of the remaining part of the URI. Most Web-enabled programs will try to dereference a URI according to the semantics of its scheme and a context-vbn For example, a Web browser will usually dereference a http://example.org/ by performing an HTTP request to the host example.org, at the default HTTP port (see Port 80). Dereferencing the URI mailto:bob@example.com will usually open a "Compose e-mail" window with the address bob@example.com in the "To" field.

"example.com" is a domain name; an IP address or other network address might be used instead.

URLs as locators

In its current strict technical meaning, a URL is a URI that, “in addition to identifying a resource, [provides] a means of locating the resource by describing its primary access mechanism (e.g., its network ‘location’).”[1]

Address bar

Enlarge picture
Address Bar in Microsoft Internet Explorer.
URLs are typically entered into the address or location bar of a web browser. To the right is a standard Microsoft Internet Explorer address bar. Address bars may of course vary in appearance depending on which web browser it is displayed in, and which skin is in use.

Clean URLs

"Clean" and "cruft-free" describe URLs which are:
  • Not tied to technical details, such as the software used or whether the resource comes from a file or a database - so that a change in the technology will not break existing links to the resource. e.g. /cars/audi/ is preferable to /cars/audi/index.php or /myprog.jsp?page=cars/audi/.
  • Not tied to internal organisational structure, such as the current editor or department that created the document - so an internal reorganisation will not cause existing links to the document to break. e.g. /recommendations/2007/xyz/ is better than /~users/jane/current-work/xyz/ or /xyz-team/recommendations/.
  • Consistent with other URLs in the same site in terms of hierarchy. This is desirable so a user can see where they are in the structure of the site, and can predict where to find what they are looking for. e.g. /cars/audi/ and /cars/ford/, instead of /cars/audi/ but /ford-cars/.
  • Consistent with other URLs in the same site in terms of action. This is desirable so a user can predict other, similar URLs on that site, e.g. if /blogs/andrea/feed/ shows a feed of Andrea's blog, then appending /feed/ to any another blog on the same site should show a feed for that blog.
  • A single location for a single resource. The same resource should not be available from multiple URLs, as this results in both confusion (Are they the same resource, or is one a copy of the other? Which is the 'right' one? Is one new and the other due to be removed?) and technical difficulties, e.g. counting links to a particular resource, or caching content to speed up access but not being able to show the cached content when the resource is accessed using a different URL.
An example of the difference between "clean" and "standard" URLs could be seen as:

Standard: http://example.com/index.php?section=articles&subsection=recent

Clean: http://example.com/articles/recent/ or http://example.com/articles/2007/

See also

External links

References

1. ^ Tim Berners-Lee, Roy T. Fielding, Larry Masinter. (January 2005). “Uniform Resource Identifier (URI): Generic Syntax”. Internet Society. RFC 3986; STD 66.
URL can refer to:
  • Underground Research Laboratory, syn. Rock Characterization Laboratory.
  • Uniform Resource Locator.
  • Unrestricted Line Officer.
  • URL, a robotic police officer character from the Futurama TV series.
  • , from the computer game .

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World Wide Web (commonly shortened to the Web) is a system of interlinked, hypertext documents accessed via the Internet. With a web browser, a user views web pages that may contain text, images, videos, and other multimedia and navigates between them using hyperlinks.
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For the taxonomical term, see .


Synonyms (in ancient Greek, συν ("syn") = plus and όνομα ("onoma") = name
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Uniform Resource Identifier (URI), is a compact string of characters used to identify or name a resource. The main purpose of this identification is to enable interaction with representations of the resource over a network, typically the World Wide Web, using specific
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A URI scheme is the top level of the URI (Uniform Resource Identifier) naming structure. All URIs and absolute URI references are formed with a scheme name, followed by a colon character, and the remainder of the URI called (in the outdated RFCs 1738 and 2396, but not the current
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Put simply, a "Namespace" is a set of names in which all names are unique.

A namespace is a context in which a group of one or more identifiers might exist. An identifier defined in a namespace is associated with that namespace.
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A web browser is a software application that enables a user to display and interact with text, images, videos, music and other information typically located on a Web page at a website on the World Wide Web or a local area network.
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Hypertext Transfer Protocol (HTTP) is a communications protocol used to transfer or convey information on the World Wide Web. Its original purpose was to provide a way to publish and retrieve HTML hypertext pages.
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Hypertext Transfer Protocol (HTTP) is a communications protocol used to transfer or convey information on the World Wide Web. Its original purpose was to provide a way to publish and retrieve HTML hypertext pages.
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E-mail (short for electronic mail; often also abbreviated as e-mail, email or simply mail) is a store and forward method of composing, sending, storing, and receiving messages over electronic communication systems.
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e-mail address identifies a location to which e-mail messages can be delivered. The term "e-mail address" is also used as the formal pre-registered authoritative electronic mailing delivery site for an individual (example: an attorney's e-mail address registered for delivery of
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domain name has multiple related meanings:
  • A name that identifies a computer or computers on the internet. These names appear as a component of a Web site's URL, e.g. wikipedia.org. This type of domain name is also called a hostname.

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An IP address (Internet Protocol address) is a unique address that certain electronic devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard (IP)—in simpler terms, a computer address.
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In computer networking, the term network address may refer to one of the following:
  • A network layer address, i.e. a logical address such as an IP address, X.25/X.21 address or IPX address.
  • The base address of a classful address range to an organization, i.e.

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The concept of Resource is primitive in the Web architecture, and is used in the definition of its fundamental elements. The term was first introduced to refer to targets of Uniform Resource Locators (URLs), but its definition has been further extended to include the referent of
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A URL bar, (also location bar, address bar), is a widget in a graphical user interface web browser that indicates the current URL; webpage address; path to a local file; or other item to be located by the browser.
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A web browser is a software application that enables a user to display and interact with text, images, videos, music and other information typically located on a Web page at a website on the World Wide Web or a local area network.
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Windows Internet Explorer (formerly Microsoft Internet Explorer abbreviated MSIE), commonly abbreviated to IE, is a series of proprietary graphical web browsers developed by Microsoft and included as part of the Microsoft Windows line of operating systems
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skins may be associated with themes as custom graphical appearances (GUIs) that can be applied to certain software and websites in order to suit the different tastes of different users.
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RSS

Screenshot of an RSS feed as seen in Mozilla Thunderbird
File extension: .rss, .xml
MIME type: application/rss+xml (Registration Being Prepared)[1]
Extended from: XML
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The curie (symbol Ci) is a unit of radioactivity, defined as

1 Ci = 3.7×1010 decays per second.


This is roughly the activity of 1 gram of the radium isotope 226
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eXtensible Resource Identifier (abbreviated XRI) is a scheme and resolution protocol for abstract identifiers compatible with Uniform Resource Identifiers and Internationalized Resource Identifiers, developed by the XRI Technical Committee at OASIS.
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first multiprotocol wide area network called the NASA Science Internet, or NSI. NSI was established to provide a total integrated communications infrastructure to the NASA scientific community for the advancement of earth, space and life sciences.
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On the Internet, the Internationalized Resource Identifier (IRI) is a generalization of the Uniform Resource Identifier (URI), which is in turn a generalization of the Uniform Resource Locator (URL).
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Percent-encoding, also known as URL encoding, is a mechanism for encoding information in a Uniform Resource Identifier (URI) under certain circumstances. Although it is known as URL encoding
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rewrite engine is a piece of web server software used to modify URLs before fetching the requested item, for a variety of purposes. This technique is known as URL rewriting.
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Uniform Resource Identifier (URI), is a compact string of characters used to identify or name a resource. The main purpose of this identification is to enable interaction with representations of the resource over a network, typically the World Wide Web, using specific
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URL normalization (or URL canonicalization) is the process by which URLs are modified and standardized in a consistent manner. The goal of the normalization process is to transform a URL into a normalized or canonical URL so it is possible to determine if two syntactically
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A website (alternatively, Web site or web site) is a collection of Web pages, images, videos or other digital assets that is hosted on one or several Web server(s), usually accessible via the Internet, cell phone or a LAN.
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URL redirection, also called URL forwarding, domain redirection and domain forwarding, is a technique on the World Wide Web for making a web page available under many URLs.
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