[Zope] moving zope site

[Webmaster Expert RH]

Hi zopers,

Here is my situation, I have a hosted zope web site, w/ VHM.
Two Domain names www.old.com and www.new.com point to the same folder
myWebSite

I had to change my domain name.

Questions are :

- how can i detect which domain name is asked (the old one or the new
one)

- in case the old DN is asked I want to RESPONSE a redirect to the new
DN and set a (is it 303) message for robots to reindex (moved
definitely) my site


Thank you