How to prevent a page from being cached?

[PythonistL]

Is there a way how to prevent a page from being cached?
I use
response= HttpResponseRedirect("/ChangeProductList/")
response['Pragma'] = "no cache"
response['Cache-Control'] = "no-cache,must-revalidate"
response['Pragma'] = "no cache"
response['Expires'] = "Wed, 11 Jan 2006 05:00:00 GMT"
return response


but when I use a sniffer to check HTTP communication I can not see any
Expires

The header from the sniffer looks like this only

GET http://www.adomain.cz/ChangeProductList/ HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/vnd.ms-excel, application/vnd.ms-powerpoint,
application/msword, application/x-shockwave-flash, application/x-icq,
*/*
Referer: http://www.obchodujte.cz/ChangeProduct/17/
Accept-Language: en-us
Proxy-Connection: Keep-Alive
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Host: www.obchodujte.cz
Pragma: no-cache
Cookie: sessionid=f6a4320bbcc80c09b1027ee2522063c2;
sessionid=f6a4320bbcc80c09b1027ee2522063c2



where can be a problem?
Thank you for help.
L.


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