Google PHP OAUTH 2.0 Fatal error: Uncaught exception 'Exception' with message 'Google CurlIO client requires the CURL PHP extension' in

[Marco Canali]

I get this error when i use the dev_appserver.py , but the curl ext is avaibale in phpinfo. When try the same prova.php on AppEngine i can't 

see nothing ! I'm searching a very easy example in php for check/undertsand when OAuth 2.0 auth works ...... 

Thanks for you time !