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Added latest knowledge on caching techniques to HEAD

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moodler
2004-12-10 06:20:54 +00:00
parent 6740dd6494
commit 5debee2de4
1 changed files with 10 additions and 5 deletions
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lib/weblib.php
+10 -5
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@@ -1565,16 +1565,21 @@ function print_header ($title='', $heading='', $navigation='', $focus='', $meta=
$direction = ' dir="ltr"';
}
if (!$cache) { // Do everything we can to prevent clients and proxies caching
@header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');
@header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
if ($cache) { // Allow caching on "back" (but not on normal clicks)
@header('Cache-Control: private, pre-check=0, post-check=0, max-age=0');
@header('Pragma: no-cache');
@header('Expires: ');
} else { // Do everything we can to always prevent clients and proxies caching
@header('Cache-Control: no-store, no-cache, must-revalidate');
@header('Cache-Control: post-check=0, pre-check=0', false);
@header('Pragma: no-cache');
@header('Expires: Mon, 20 Aug 1969 09:23:00 GMT');
@header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
$meta .= "\n".'<meta http-equiv="pragma" content="no-cache" />';
$meta .= "\n".'<meta http-equiv="expires" content="0" />';
$meta .= "\n<meta http-equiv=\"pragma\" content=\"no-cache\" />";
$meta .= "\n<meta http-equiv=\"expires\" content=\"0\" />";
}
@header('Accept-Ranges: none');
if ($usexml) { // Added by Gustav Delius / Mad Alex for MathML output
// Modified by Julian Sedding