[Zope] modify 'Server' response header

[Jens-Erik Hansen]

Hi,

is there a way to control the 'Server' response header in ZServer like it 
could be done with the ServerTokens directive in apache?

In an apache -> squid -> zope configuration I tried apache's mod_headers but 
this only works if the page is cached in the browser (304 Not Modified), a 
browser-reload for example reveals ZServer.

Does anyone know how to accomplish this without modifying any zope code?
 
Thanks
Jens