<META HTTP-EQUIV=" " CONTENT=" ">
gives information that appears in the HTTP headers (such as the expiry date)
typical HTTP-EQUIVs are 'Expires', 'Keywords', 'Reply-To'. You
should be careful not to use information that will be provided by
the server (date, server name, last modified date, etc.).
If the document should be refreshed every so often
<meta http-equiv="Refresh" content="time in seconds">
If the document should be replaced in the browser by a new document:
<meta HTTP-EQUIV=REFRESH content="time;URL=url">