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Tuesday, November 22, 2011

URL - Uniform Resource Locator

URL - Uniform Resource Locator

When you click on a link in an HTML page, an underlying <a> tag points to an address on the world wide web.
A Uniform Resource Locator (URL) is used to address a document (or other data) on the world wide web.
A web address, like this: http://www.Excitingsearch.com follows these syntax rules:
scheme://host.domain:port/path/filename
Explanation:
  • scheme - defines the type of Internet service. The most common type is http
  • host - defines the domain host (the default host for http is www)
  • domain - defines the Internet domain name, like w3schools.com
  • :port - defines the port number at the host (the default port number for http is 80)
  • path - defines a path at the server (If omitted, the document must be stored at the root directory of the web site)
  • filename - defines the name of a document/resource

Common URL Schemes

The table below lists some common schemes:
Scheme Short for.... Which pages will the scheme be used for...
http HyperText Transfer Protocol Common web pages starts with http://. Not encrypted
https Secure HyperText Transfer Protocol Secure web pages. All information exchanged are encrypted
ftp File Transfer Protocol For downloading or uploading files to a website. Useful for domain maintenance
file
A file on your computer