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(computer science)



(Uniform Resource Locator) The address that defines the route to a file on an Internet server (Web server, mail server, etc.). URLs are typed into a Web browser to access Web pages and files, and URLs are embedded within the pages themselves as links (see hypertext).

The URL contains the protocol prefix, port number, domain name, subdirectory names and file name. If a port number is not stated in the address, port 80 is used as the default for Web traffic (HTTP traffic). See port 80 and TCP/IP port.

Downloading the Home Page
To access a home page on a website, only the protocol and domain name are required. For example, http://www.computerlanguage.com retrieves the home page of the Computer Language Company's website. HTTP is the Web protocol, and WWW.COMPUTERLANGUAGE.COM is the domain name. Browsers default to the http:// prefix so only the www.computerlanguage.com needs to be typed in. In fact, you can usually omit the WWW and dot, because most websites treat blank hostnames as "www" hostnames. Sometimes, you can even omit the .com, and the browser fills it in automatically.

Another Web Page
If a page is not the home page, its name has to be part of the address, and a slash is used to separate it from the domain name. For example http://www.computerlanguage.com/about.htm points to the About page (about.htm file). See URL shortening.

The Full Path
If a page is stored in a subdirectory (folder within a folder), its name is also separated by a slash, and subdirectories can be several levels deep. Follow the example below:
Hypothetical URL:


 This:          Is the:

 http://        protocol

 www.car.com/   domain

 kia/           subdirectory

 used/          subdirectory

 2008.html      file (Web page)

Is It a URL or a URI?

Technically, a URL is a type of uniform resource identifier (URI). Since most URIs are URLs, "URL" is the term more commonly heard. See URI.
References in periodicals archive ?
Firebase software engineer Michael Hermanto told The Verge that since 2009, the ways in which people share information on the web has changed, while additional URL shorteners have grown in popularity.
Every year the trend is up for the international use of short URLs. Branded URL Shortening is an excellent tool for online marketing.
Also in the vein of simplicity, many organizations are moving away from the traditional www in their URL. It is easy to configure a web server so that any requests to www.mylibrary.org are automatically redirected to mylibrary.org.
To hide the server's name from the URL of a credential submitting web page, a form's action link is assigned a different domain from the one appearing in the page's URL [20].
In this section, a basic overview of how the structure of a URL looks as well as the different URL features that are modified and maliciously used by phishers to lure users are discussed.
BluePrint Data OEMs its URL filter and content filtering databases, technology, and security products and services to Internet Security vendors such as Unified Threat Management (UTM), Managed Service Providers (MSP), Managed Security Service Providers (MSSP) and Software as a Service (SaaS) providers as well as providing private label / OEM services to Value Added Resellers (VARs), Information Technology Providers, Anti Virus and Anti Spam service providers, Independent Software Vendors (ISVs), help telecom, carriers, and ISPs and other companies.
Less obvious, though, was that the rigor of URL patterns, and the thinking it reflected, became increasingly correlated with the value (including authority and quality) of associated content.
Currently, most Google+ URLs are random number strings that are hard to search for and remember.
Earlier, Google+ custom URLs rolled out to a limited number of 'verified' users.
"It is possible that spammers are setting up their own URL shortening sites since legitimate URL shortening sites, which have long suffered with abuse, have slightly improved their detection of spam and other malicious URLs." www.symantec.com.
The server has not found anything matching the URL given.