passing an encoded url ..

[eluser]/larry[/eluser]
I have a controller called filter that basically sets up a redirect to another
controller called filterlist. It encodes a url as one of it's arguments. filterlist is then set up to do pagination:

filter does this:

$val = urlencode($filter_val);
redirect("/widget/filterlist/$val/$fld");

the resulting url then looks like this:
http://my.local/widget-admin-codeigniter...l_addr_url

What I get is this error:

The requested URL /widget-admin-codeigniter/index.php/widget/filterlist/http://ajaxian.com/index.xml/xml_addr_url was not found on this server


I saw that I can set up Codeigniter to use parameters instead of the usual
url scheme it uses, but it appears I can't do it both ways, and I think doing that
will change the browser caches the pages as well, so I'm not sure that's a good approach.
I guess you can't mix the two ? Otherwise I would try maybe:

widget/filterlist/$fld/?val=$val

The way around it seems to be to use a session, which is not ideal, but the site is an admin interface and won't get any real traffic.

Any ideas appreciated ...