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')