[mod_python] No expiration datestamp on SessionID cookie

Hi,

I have a few webapp running with mod_python, and I just had the  
request to expire a Session when the browser window is closed. I have  
done that in other web framework by NOT setting the expiration of a  
cookie, usually the browser then understand that it needs to destroy  
the cookie when the window/tab is closed.

I am looked through the last 2-3 year on the list and in the current  
3.2 doc but I can't find anywhere a way to specify the expiration  
date of the SessionID cookie.

Thank you in advance for sharing if you managed to get the described  
behavior working in mod_python, or if I missed something in the doc.

Regards,

Sébastien