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restoring Dougal's Conditional GET logic, way better than the poop I had placed there 

git-svn-id: http://svn.automattic.com/wordpress/trunk@1043 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
michelvaldrighi 2004-03-31 21:19:58 +00:00
parent ed666a5547
commit 9fd1556828
1 changed files with 14 additions and 30 deletions
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44
wp-blog-header.php
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@ -85,40 +85,24 @@ if (!isset($doing_rss) || !$doing_rss) {
} else {
// We're showing a feed, so WP is indeed the only thing that last changed
$last_modified_date = mysql2date("D, d M Y H:i:s", get_lastpostmodified('GMT')).' GMT';
@header('Last Modified: '.$last_modified_date);
@header('ETag: "'.md5($last_modified_date).'"');
$wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT')).' GMT';
$wp_etag = '"'.md5($wp_last_modified).'"';
@header('Last Modified: '.$wp_last_modified);
@header('ETag: '.$wp_etag);
@header ('X-Pingback: ' . get_settings('siteurl') . '/xmlrpc.php');
// Checking If-Modified-Since and If-None-Match,
// works only on Apache but should fail gracefully elsewhere
$request_headers = getallheaders();
// Support for Conditional GET
$client_last_modified = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
$client_etag = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
if ( !empty($request_headers['If-Modified-Since']) OR !empty($request_headers['If-None-Match']) ) {
$_match_ifmodifiedsince = 0;
$_match_ifnonematch = 0;
if (!empty($request_headers['If-Modified-Since'])) {
if (strtotime($request_headers['If-Modified-Since']) >= strtotime($last_modified_date)) {
$_match_ifmodifiedsince = 1;
} else {
$_match_ifmodifiedsince = -1;
}
}
if (!empty($request_headers['If-None-Match'])) {
if ($request_headers['If-None-Match'] == '"'.md5($last_modified_date).'"') {
$_match_ifnonematch = 1;
} else {
$_match_ifnonematch = -1;
}
}
// if one element is present but doesn't match the header, the -1 makes this <=0
if ($_match_ifmodifiedsince + $_match_ifnonematch > 0) {
header("HTTP/1.1 304 Not Modified\n\n");
}
if ( ($client_last_modified && $client_etag) ?
(($client_last_modified == $wp_last_modified) && ($client_etag == $wp_etag)) :
(($client_last_modified == $wp_last_modified) || ($client_etag == $wp_etag)) ) {
header('HTTP/1.1 304 Not Modified');
echo "\r\n\r\n";
exit;
}
}
/* Getting settings from db */