Default implementations of url_handler api.
Copyright 2005 by the Source Mage Team
=item url_default_bucketize Outputs file as that is the dl handler for file:// urls
=item url_default_crack Outputs the url with the prefix removed
=item url_default_expand
=item url_default_is_valid True if url_crack returns true
=url_default_verify Always returns true
=item url_default_hostname Outputs localhost
=item url_default_netselect Fake netselect return 0 for each url