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Nov 21, 2010 · A question and answers about the meaning and usage of URI and URL, two terms related to identifying and locating resources on the Internet. See definitions, examples, and links to related topics.
Usage example
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- Overview
- URLs and URNs
- Syntax of Uniform Resource Identifiers (URIs)
- Usage notes
The target of an HTTP request is called a "resource", whose nature isn't defined further; it can be a document, a photo, or anything else. Each resource is identified by a Uniform Resource Identifier (URI) used throughout HTTP for identifying resources.
URLs
The most common form of URI is the Uniform Resource Locator (URL), which is known as the web address. Any of those URLs can be typed into your browser's address bar to tell it to load the associated page (resource). A URL is composed of different parts, some mandatory and others optional. A more complex example might look like this:
URNs
A Uniform Resource Name (URN) is a URI that identifies a resource by name in a particular namespace. The two URNs correspond to •the book Nineteen Eighty-Four by George Orwell, •the IETF specification 7230, Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing.
Scheme or protocol
http:// is the protocol. It indicates which protocol the browser must use. Usually it is the HTTP protocol or its secured version, HTTPS. The Web requires one of these two, but browsers also know how to handle other protocols such as mailto: (to open a mail client) or ftp: to handle a file transfer, so don't be surprised if you see such protocols. Common schemes are:
Authority
www.example.com is the domain name or authority that governs the namespace. It indicates which Web server is being requested. Alternatively, it is possible to directly use an IP address, but because it is less convenient, it is not often used on the Web.
Port
:80 is the port in this instance. It indicates the technical "gate" used to access the resources on the web server. It is usually omitted if the web server uses the standard ports of the HTTP protocol (80 for HTTP and 443 for HTTPS) to grant access to its resources. Otherwise, it is mandatory.
When using URLs in HTML content, you should generally only use a few of these URL schemes. When referring to subresources — that is, files that are being loaded as part of a larger document — you should only use the HTTP and HTTPS schemes. Increasingly, browsers are removing support for using FTP to load subresources, for security reasons.
FTP is still acceptable at the top level (such as typed directly into the browser's URL bar, or the target of a link), although some browsers may delegate loading FTP content to another application.
Rhody the Ram. Website. www .uri .edu. The University of Rhode Island ( URI) is a public land-grant research university with its main campus in Kingston, Rhode Island, United States. It is the flagship public research as well as the land-grant university of Rhode Island. The university is classified among "R2: Doctoral Universities – High ...
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URI (Uniform Resource Identifier): A URI (Uniform Resource Identifier) is a sequence of characters that identifies a logical or physical resource. Universal Resource Identifiers are specified in the Internet Engineering Task Force (IETF) Request for Comments (RFC) 3986 and are summarized and extended in documentation for the W3C’s Web ...
