Index: http_filters.c
===================================================================
--- http_filters.c	(revision 358461)
+++ http_filters.c	(working copy)
@@ -714,6 +714,8 @@
         server = apr_table_get(r->headers_out, "Server");
         if (server) {
             form_header_field(&h, "Server", server);
+        } else {
+            form_header_filed(&h, "Server", ap_get_server_version());
         }
     }
     else {