The 501 by itself won't filtered based upon URL, but it can ask a Websense or other system about the URLs, and allow/deny web traffic that way. Check the 'show version' of your PIX and see if you have the "URL-filtering" enabled or not. See http://www.websense.com/SupportPortal/Tutorials/1472.aspx for how to configure both ends (assuming Websense)
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