I have a search function that sets the expires header of the RESPONSE: def search(RESPONSE, performers=None, keywords=None, venue="", event="", city="", state="", country="", date="", age=10000, radius=0, repeat="once", format="text", editor="", email="", start=0, nhits=20, REQUEST=None): """Musi-Cal search function""" ... RESPONSE.setHeader('Expires', time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(time.time()))) return _search_tmpl(..., REQUEST=REQUEST, RESPONSE=RESPONSE, ...) but I don't see any expires header in the response: HTTP/1.0 200 OK Server: Medusa/1.4 Content-Length: 30605 Date: Mon, 01 Feb 1999 21:46:55 GMT Am I doing something wrong or am I encountering a wart on ZServer? I haven't tried ZopeHTTPServer, but that will be my step. Skip Montanaro | Mojam: "Uniting the World of Music" http://www.mojam.com/ skip@mojam.com | Musi-Cal: http://www.musi-cal.com/ 518-372-5583