Url (uniform Resource Locator)

URL (Uniform Resource Locator)A Uniform Resource Locator, or URL (pronounces as “earl” (SAMPA: [@rl]) or spelled out), is a standardized address for some resource (such as a document or image) on the Internet. First created by Tim Berners-Lee for use on the World Wide Web, the currently used forms are detailed by IETF standard RFC 2396 (http://www.ietf.org/rfc/rfc2396.txt) (1998).The URL was a fundamental innovation in creating the World Wide Web.It combines into one simple address the four basic items of informationnecessary to find a document anywhere on the Internet:The protocol to use to communicate with that machineThe machine or domain name to go toAn open network port on the target machine connected to some service The path or file name on that machineA typical simple URL can look like: http://www.wikipedia.org:80/wikiwhere http: specifies which protocol to use. //www.wikipedia.org specifies the domain name to contact. :80 specifies the network port number of the remote machine. Under most circumstances, this portion may be omitted entirely. In the case of the http protocol the default value is 80. /wiki is the request path on the specified system.Most Web browsers do not require the user to enter “http://”: to go to a Web page one usually just enters the page name (without the slashes) such as www.wikipedia.org/wiki/Train. To go to the homepage one usually just enters the domain name such as www.wikipedia.orgHTTP URLs can also contain additional elements, like a query string (placed after the path and separated from it by a question mark (?)) containing information from a html form with method=get, or a name tag (placed after the path and separated from it by a sharp mark (#)) giving the location within a hypertext page to display. FTP URLs often contain a port number.Examples:http://www.wikipedia.org/w/wiki.phtml?title=Train&action=historyhttp://www.wikipedia.org/wiki/Train#Model_railwaysThis article is licensed under the GNU Free Documentation License, and uses material from the Wikipedia article “url”.

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