@frostiek
I have already seen that,
<meta http-equiv="expires" content="mon, 27 sep 2010 14:30:00 GMT">
The date has to be added in the RFC850 format...
that's not a valid answer,,
some people says, due to get rid from page cache, it is mandatory to equiv meta tag content in expiration date...
some says, making meta http expiration date is not good,,,
what a tragedy ? diff. opinion ..........