note 73998 deleted from function.header by felipe

Note Submitter: neil at 11 out of 10 

----

Response to hervard at gmail dot com (18-Apr-2006 06:53)

The code you gave for preventing the message appearing with the back button did not work for IE7, but changing the line:

$offset = 60 * 60 * 24 * -1;
to
$offset = 60 * 60 * 24 * 1;

makes it work OK, with my set up there's no issues with serving cached versions of the page.
 
<?php

  // Original code found at http://www.mnot.net/cache_docs/ 
  // thanks to hervard at gmail dot com for this solution to browser back button problems

   header("Cache-Control: must-revalidate");
   $offset = 60 * 60 * 24 * 1;
   $ExpStr = "Expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " GMT";
   header($ExpStr); 

?>

I've tested this in a standalone version of IE6
Also tested in IE7, Firefox 1.5, Opera 7.54