URL downloader does not follow redirects

When adding a resource such as a file to a course, using the URL downloader in the File picker dialog fails when a website is entered that redirects the user.

Steps to reproduce:
1. Add a new File resource.
2. In the Content Section, click on "Add..."
3. In the file picker, select "URL downloader"
4. Type google.com in the URL box and click Download.

This is what comes up when following these steps:
HTTP/1.1 301 Moved Permanently Location: http://www.google.com/ Content-Type: text/html; charset=UTF-8 Date: Thu, 14 Jun 2012 18:23:40 GMT Expires: Sat, 14 Jul 2012 18:23:40 GMT Cache-Control: public, max-age=2592000 Server: gws Content-Length: 219 X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN

Note that typing www.google.com into the URL box does work. Google automatically redirects users from http://google.com to http://www.google.com, which the URL downloader cannot handle.