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Full Discussion: www-csli
Top Forums Web Development www-csli Post 302350930 by pludi on Sunday 6th of September 2009 01:36:24 PM
Old 09-06-2009
Short Answer: because they can

Long Answer: because the string 'www' does not identify the service provided. The 'name' of a site is just an alias for the IP of the computer serving the site. All transfer is done using the IP address. In order to find out what IP address belongs to which computer, the DNS network is queried, which maps the URL to an address, and one IP can serve more than one URLs. The identification of which service is used is done by the protocol part of the URL, eg http:// or ftp://, which the client application (eg. the browser) will translate to a certain port (eg. Port 80/TCP). Sites like freshmeat.net even do away with the 'www' part completely.
In larger installations the distinction using the URL is/was done to distinct between server for HTTP (www), FTP (ftp), or E-Mail (smtp/pop).
 

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XDG-OPEN(1)															       XDG-OPEN(1)

NAME
xdg-open - opens a file or URL in the user's preferred application SYNOPSIS
xdg-open {file URL} xdg-open {--help --manual --version} DESCRIPTION
xdg-open opens a file or URL in the user's preferred application. If a URL is provided the URL will be opened in the user's preferred web browser. If a file is provided the file will be opened in the preferred application for files of that type. xdg-open supports file, ftp, http and https URLs. xdg-open is for use inside a desktop session only. It is not recommended to use xdg-open as root. OPTIONS
--help Show command synopsis. --manual Show this manualpage. --version Show the xdg-utils version information. EXIT CODES
An exit code of 0 indicates success while a non-zero exit code indicates failure. The following failure codes can be returned: 1 Error in command line syntax. 2 One of the files passed on the command line did not exist. 3 A required tool could not be found. 4 The action failed. EXAMPLES
xdg-open 'http://www.freedesktop.org/' Opens the Freedesktop.org website in the user's default browser xdg-open /tmp/foobar.png Opens the PNG image file /tmp/foobar.png in the user's default image viewing application. AUTHOR
Kevin Krammer, Jeremy White. <kevin.krammer@gmx.at> <jwhite@codeweavers.com> xdg-utils 1.0 06/24/2007 XDG-OPEN(1)
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