URJL Uniform Resource Java Locator
URJL: You Are Jay Leno
URJL Your Jennifer Lopez
Uniform Resource Locator (URL) formerly known as Universal Resource Locator, is
a technical, Web-related term used in two distinct meanings:
In popular usage, including 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
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]
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/
Clean URLs with web services
Web services have been created that allow users to create short URLs which are
easier to write down, remember or pass around. They are also more suitable for
use where space is limited, for example in an IRC conversation, email signature,
online forum or fixed width document (eg. email). A sample of current web
services are provided below:
MyLocator.com - Pioneer of Vertical Locator Technology: 1300+ Vertical Locator
Domains.
TinyURL.com - probably the most widely used due to its memorable name. Example:
http://www.tinyurl.com/qvqqo
doiop.com - one of the early services which offers keywords as opposed to random
URLs. Example: http://doiop.com/keyword
dtmurl.com
href.to - Very catchy and easy to remember name. Example: http://href.to/Qj6
gu.ma
notlong.com - lets you choose your own sub-domain. Example: http://your-choice.notlong.com/
SnipURL.com (synonyms: snurl.com, snipr.com)
shorl.com
URLStrip.com
urjl urjl.com
Clean URLs of third-party clean URLs
Ultimately these services hide the final destination from a web user. This can
be used to unwittingly send people to sites that offend their sensibilities, or
crash or compromise their computer using browser vulnerabilities. To help combat
such abuse, TinyURL allows a user to set a cookie-based preference such that
TinyURL stops at the TinyURL website, giving a preview of the final link, when
that user clicks TinyURLs. Substituting http://preview.tinyurl.com for http://tinyurl.com
in the URL is another way of stopping at a preview of the final link before
clicking through to it. Opaqueness is also leveraged by spammers[2], who can use
such links in spam (mostly blog spam), bypassing URL blacklists.
Furthermore, this approach creates dependency on a third-party service that may
change, go away, or maintain privacy-compromising logs of user activity
indefinitely.
Address bar
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.
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RuneScape takes place in the fantasy-themed realm of Gielinor, which is divided
into several different kingdoms, regions, and areas. Players can travel
throughout the gaming world on foot, by using magical teleportation spells or
devices, or mechanical means of transportation. Each region offers different
types of monsters, materials, and quests to challenge players. Players are shown
on the screen as customisable avatars. They set their own goals and objectives,
deciding which of the available activities to pursue. There is no linear path
that must be followed. Players can engage in combat with other players or with
monsters, complete quests, or increase their experience in any of the available
skills. Players interact with each other through trading, chatting, or playing
combative or cooperative mini-games.
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