ActiveState Code

Recipe 52562: Turning off caching for a specific page in Zope

Sometimes you just don't want a page to be cached, ever, by the client's web browser. This recipe tells you how to do that from DTML.

Python 
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From DTML:

<dtml-call "RESPONSE.setHeader('Cache-Control', 'no-cache')">
<dtml-call "RESPONSE.setHeader('Pragma', 'no-cache')">


From python/python script:

def noCache(self, REQUEST):
    REQUEST.RESPONSE.setHeader('Cache-Control', 'no-cache')
    REQUEST.RESPONSE.setHeader('Pragma', 'no-cache')

Discussion

There are two things done here. The first is to set the "Cache-Control" header. This works on newer browsers. The second is to set the Pragma header. Older browsers use this one. A newer browser will ignore Pragma if Cache-Control is defined.

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