version 1.9b

1 files changed, 16 insertions, 1 deletions

diff --git a/blog.php b/blog.php
index e591dc9..17e2fb5 100644
--- a/blog.php
+++ b/blog.php
@@ -1,6 +1,6 @@
 <?php
 
-//  blogRight! version 1.9 (2005-07-30)
+//  blogRight! version 1.9b (2005-09-03)
 //  Copyright (C) 2004, 2005 Wojciech Polak.
 //
 //  This program is free software; you can redistribute it and/or modify
@@ -194,8 +194,23 @@ $year_array = array (); // Array of years for copyright purposes
 if (isset ($RSS) || isset ($_REQUEST['rss']))
 {
   $pubDate = date ("D, d M Y H:i:s O", filemtime ($include_files[0]));
+  $lastModified = gmdate ("D, d M Y H:i:s T", filemtime ($include_files[0]));
+  $ETag = '"'.md5 ($lastModified).'"';
 
+  $headers = getallheaders ();
+  if (array_key_exists ('If-Modified-Since', $headers) &&
+      array_key_exists ('If-None-Match', $headers))
+  {
+    if ($headers['If-Modified-Since'] == $lastModified &&
+	$headers['If-None-Match'] == $ETag)
+    {
+      header ('HTTP/1.1 304 Not Modified');
+      exit ();
+    }
+  }
   header ("Content-Type: text/xml; charset=$charsetEncoding");
+  header ("Last-Modified: $lastModified");
+  header ("ETag: $ETag");
 
   echo '<?xml version="1.0" encoding="'.$charsetEncoding.'"?>'."\n";
   echo '<rss version="2.0">'."\n";