The URL Scraper provider gets content from the configured URIs and before sending them to the browser, it expands all relative URIs to absolute URIs.
For example, if a user is trying to access the site with content as:
<a href="../mypage.html">
Rewriter translates this to:
<a href="http://yahoo.com/mypage.html">
where http://yahoo.com/test/ is the base URL of the page.
See the Sun Java SystemPortal Server Administration Guide for details on the URLScraper provider.