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your aggregator will love you, feeds now support sending a 304 Not Modified header when needed

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git-svn-id: http://svn.automattic.com/wordpress/trunk@1036 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
michelvaldrighi 2004-03-31 03:54:58 +00:00
parent 7e4efe6b26
commit 9fc4f5900e
1 changed files with 34 additions and 1 deletions
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35
wp-blog-header.php
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@ -83,9 +83,42 @@ if (!isset($doing_rss) || !$doing_rss) {
@header("Pragma: no-cache"); // HTTP/1.0
@header ('X-Pingback: '. get_settings('siteurl') . '/xmlrpc.php');
} else {
// We're showing a feed, so WP is indeed the only thing that last changed
@header('Last Modified: ' . mysql2date("D, d M Y H:i:s", get_lastpostmodified('GMT')).' GMT');
$last_modified_date = mysql2date("D, d M Y H:i:s", get_lastpostmodified('GMT')).' GMT';
@header('Last Modified: '.$last_modified_date);
@header('ETag: "'.md5($last_modified_date).'"');
@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
$request_headers = getallheaders();
if ( !empty($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) {
header("HTTP/1.1 304 Not Modified\n\n");
}
}
}
/* Getting settings from db */