Currently connection is closed always when '304 Not modified' response is sent by server.

This patch prevents connection closing when this response is sent (this happens for example when If-Modified-Since header is used with request) and keep-alive is active.

This greatly speeds up checking if you have up-to-date files/data on servers with keep-alive enabled.

Patch:

--- old/Socket.php  2008-02-16 12:58:39.000000000 +0200
+++ new/Socket.php  2008-05-26 11:06:34.000000000 +0300
@@ -285,6 +285,9 @@
                 $response .= $chunk;
             }
 
+        } elseif (Zend_Http_Response::extractCode($response) == 304) {
+            return $response;
+        
         // Fallback: just read the response (should not happen)
         } else {
             while ($buff = @fread($this->socket, 8192)) {