What is a URL?

URL stands for Uniform Resource Locator. The URL is the technical term for what is often referred to as "Web address." It is the address of computers and documents on the Internet. The URL was by Tim Berners-Lee as one of its many contributions to the World Wide Web.

The place is a short text string that contains the name of a computer on the Internet, a protocol for communication with the computer, a path and file name in a document on this computer, and sometimes additional information. Participation of all this information in a single string enable seamless interaction between computers over the Internet and the rapid exchange of information. The URL was designed to be expandable in the sense that as new types of documents will be added to the Internet, the URL would be able to adapt and to identify any act of any new document format.

For the full URL is a service name, followed by a colon and a variety of names, possibly followed by a colon and a port, followed by a way of ending with a filename or directory. An example of a full URL is as follows: "service: hostname.com: 80/directory/file.html." Most URLs, the people are the addresses of documents on the World Wide Web. These URLs, usually the HTTP protocol and port eliminated. In addition, worthy of the name of a URL starts with two slashes. An example of such a URL looks like this: "http://hostname.com/."

Note that in this instance, the path is a single blow, and no file name. It says the Web server that you have to set the default file in the top public directory on the server. If the Web has no standard file, you can either view a list of files in the directory or an error. A common error is the URL without specifying a path. Although most Web servers are configured so that this error by automatically assume that the user wants the standard in the top index, the unnecessary server load and can lead to the wrong document will be served.

Even if a URL, enter a special document to the site on the Internet, electronic documents can be easily copied and thus may be more than one location. Therefore, the concepts of URN (Uniform Resource Name) and URI (Uniform Resource Identifier) has been developed. Urnor name of a specific resource, whether it is the appropriate time. URIs are just URLs in the file name is a URN. For example, two Web can be both a copy of the book in 1984. The book can all file names, but the International Standard Book Number for 1984 will always be "ISBN 0-452-28423-6.

It is the uri of the book 1984 would be logical" isbn.0-452-28423-6 ". A URL of type "http://server1.com/isbn.0-452-28423-6" would be a URI for the book in 1984. Another URI for the same book, "http://server2.net/ books/isbn.0- 452-28423-6. "Both URI would preferably be identical documents. The difference between a URL and a URI is often arbitrary, since most documents on the World Wide Web is not covered by the name of each Standards Organization.