Uniform Resource Locators (URLs) Scheme Port Number Query - - PowerPoint PPT Presentation

CS 142 Lecture Notes: URLs and Links Slide 1

Uniform Resource Locators (URLs)

http://www.company.com:81/a/b/c.html?user=Alice&year=2008#p2

Scheme Host Name Port Number Hierarchical portion Query Fragment

CS 142 Lecture Notes: URLs and Links Slide 2

<a> Examples

• Full URL:

<a href="http://www.xyz.com/news/2009.html">2009 News</a>

• Absolute location in same site:

<a href="/stock/quote.html"> same as http://www.xyz.com/stock/quote.html

• Relative location:

<a href="2008/March.html"> same as http://www.xyz.com/news/2008/March.html

• Anchor definition:

<a name="sec3">...</a>

• New location, same page:

<a href="#sec3">

CS 142 Lecture Notes: URLs and Links Slide 3

Other Uses of URLs

• Images:

<img src="icon.gif" />

• Stylesheets:

<link rel="stylesheet" type="text/css" href="main.css" />

• Embedded page:

<iframe src="http://www.google.com" />

CS 140 Lecture Notes: File Systems Slide 4