Possible Duplicate:
Why does Google prepend while(1); to their JSON responses?
I'm playing firebug with Google Calendar. I happens to find that some XHR request has response like below:
while(1);[['us','bW9yZ2FuLmNoZW5nbW9AZ21haWwuY29t 20090320/20090904 63378122163']]
It looks like a JSON with prefix dead-loop javascript statements.
I'm not sure why Google Calendar has such kind of XHR response. Is there any known AJAX practice about this?