I am getting a cache validator issue for Piwik script, it reads:
The following resources are missing a cache validator. Resources that do not specify a cache validator cannot be refreshed efficiently. Specify a Last-Modified or ETag header to enable cache validation for the following resources:
http://www.earn-income-at-home.info/piwik/piwik.php?action_name=Free%20Earn%20Income%20At%20Home%20Course&idsite=1&rec=1&r=530137&h=21&m=38&s=13&url=http%3A%2F%2Fwww.earn-income-at-home.info%2F&_id=d57de6196094d323&_idts=1331158533&_idvc=8&_idn=0&_refts=0&_viewts=1331250640&pdf=1&qt=0&realp=0&wma=0&dir=0&fla=1&java=1&gears=0&ag=1&res=1440x900&cookie=1
How and where do I specify a Last-Modified or ETag header to enable cache validation?
Thank you,
Bernard