here follows the /var/log/cups/access_log {{{ localhost - - [02/Sep/2007:20:36:21 +0800] "GET / HTTP/1.1" 404 0 - - localhost - - [02/Sep/2007:20:38:09 +0800] "GET / HTTP/1.0" 200 5252 - - }}} it failed with HTTP/1.1 but worked with HTTP/1.0