This scenario is from the bug report #708708, see link below.

-- start --
I encountered a problem with curl-7.10.3 on RedHat7.3. I wrote a simple
program to go to the following urls in this order:

1. http://www.baylor.edu/frankie
returns 302 and redirected to....
2. http://www3.baylor.edu/frankie
return 404 and error page
3. https://www.baylor.edu/includes/nsstyle.css
notice the "https:" at the beginning
return 200 ok
4. http://www.yahoo.com
return 200 ok but the content is actually http://www.baylor.edu/

Notice that this problem __only__ appears when curl is set
to use proxy server.
-- end --

http://sourceforge.net/tracker/index.php?func=detail&aid=708708&group_id=976&atid=100976

-- 
 Daniel Stenberg -- curl, cURL, Curl, CURL. Groks URLs.
-------------------------------------------------------
This SF.net email is sponsored by:
The Definitive IT and Networking Event. Be There!
NetWorld+Interop Las Vegas 2003 -- Register today!
http://ads.sourceforge.net/cgi-bin/redirect.pl?keyn0001en