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An Internet resource is accessed using a Universal Resource Locator (URL), which is composed of three elements: the transfer protocol, the hostname, and the pathname The transfer protocol and the hostname are separated by a colon and two slashes, :// The pathname always begins with a single slash:
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transfer-protocol://host-name/path-name
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The transfer protocol is usually HTTP (Hypertext Transfer Protocol), indicating a web page Other possible values for transfer protocols are ftp and file As their names suggest, ftp initiates FTP sessions, whereas file displays a local file on your own system, such as a text or HTML file Table 14-1 lists the various transfer protocols The hostname is the computer on which a particular website is located You can think of this as the address of the website By convention, most hostnames begin with www In the next example, the URL locates a web page called guideshtml on the tldporg website:
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If you do not want to access a particular web page, you can leave the file reference out, and then you automatically access the website s home page To access a website directly, use its hostname If no home page is specified for a website, the file indexhtml in the top directory is often used as the home page In the next example, the user brings up the GNOME home page:
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The pathname specifies the directory where the resource can be found on the host system, as well as the name of the resource s file For example, /pub/Linux/newdathtml references an HTML document called newdat located in the /pub/Linux directory The resource file s extension indicates the type of action to be taken on it A picture has a gif or jpeg extension and is converted for display A sound file has an au or wav extension and is played The following URL references a gif file Instead of displaying a web page, your browser invokes a graphics viewer to display the picture Table 14-2 provides a list of the more common file extensions
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Most web browsers are designed to access several different kinds of information Web browsers can access a web page on a remote website or a file on your own system Some browsers can also access a remote news server or an FTP site The type of information for
Protocol http ftp telnet news Description Uses Hypertext Transfer Protocol for website access Uses File Transfer Protocol for anonymous FTP connections Makes a Telnet connection Reads Usenet news; uses Network News Transfer Protocol (NNTP)
TABLE 14-1 Web Protocols
14:
W e b , F T P, a n d J a v a C l i e n t s
File Type html Graphics Files gif jpeg png Sound Files au wav aiff Video Files QT mpeg avi
Description Web page document formatted using HTML, the Hypertext Markup Language
Graphics, using GIF compression Graphics, using JPEG compression Graphics, using PNG compression (Portable Network Graphics)
Sun (Unix) sound file Microsoft Windows sound file Macintosh sound file
QuickTime video file, multiplatform Video file Microsoft Windows video file
TABLE 14-2 Web File Types
a site is specified by the keyword http for websites, nntp for news servers, ftp for FTP sites, or file for files on your own system As noted previously, several popular browsers are available for Linux Three distinctive ones are described here: Mozilla, Konqueror, and Lynx Mozilla is an X Window System based web browser capable of displaying graphics, video, and sound, as well as operating as a newsreader and mailer Konqueror is the K Desktop file manager KDE has integrated full web-browsing capability into the Konqueror file manager, letting you seamlessly access the Web and your file system with the same application Lynx and ELinks are command line based browsers with no graphics capabilities, but in every other respect they are fully functional web browsers To search for files on FTP sites, you can use search engines provided by websites, such as Yahoo!, Google, or Lycos These usually search for both web pages and FTP files To find a particular web page you want on the Internet, you can use any of these search engines or perform searches from any number of web portals Web searches have become a standard service of most websites Searches carried out on documents within a website may use local search indexes set up and maintained by indexing programs like ht:/Dig Sites using ht:/Dig use a standard web page search interface Hypertext databases are designed to access any kind of data, whether it is text, graphics, sound, or even video Whether you can actually access such data depends to a large extent on the type of browser you use
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