if ($_SERVER['REQUEST_METHOD'] == 'GET')  // may be we need HEAD support ???	

9.4 HEAD

The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This method is often used for testing hypertext links for validity, accessibility, and recent modification.

The response to a HEAD request MAY be cacheable in the sense that the information contained in the response MAY be used to update a previously cached entity from that resource. If the new field values indicate that the cached entity differs from the current entity (as would be indicated by a change in Content-Length, Content-MD5, ETag or Last-Modified), then the cache MUST treat the cache entry as stale.

diff --git a/wacko/class/http.php b/wacko/class/http.php
--- a/wacko/class/http.php
+++ b/wacko/class/http.php
@@ -191,7 +191,7 @@
 				$lastm = substr($lastm, 0, $p);
 			}
 
-			if ($_SERVER['REQUEST_METHOD'] == 'GET') // may be we need HEAD support ???
+			if ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'HEAD')
 			{
 				if (!$lastm && !$etag);
 				else if ($lastm && $gmt != $lastm);	

if (!$user && $this->page['modified'])
{
	header('Last-Modified: ' . Ut::http_date(strtotime($this->page['modified']) + 120));
}