Facebook graph api JSONP format , what does the /* */ in first line signify?

Question

I noticed an empty comment block in JSONP output returned by facebook graph api for all methods.

URL that I called :

https://graph.facebook.com/NUMER         


        

Answer 1

We added this to protect against an attack where a third party site bypasses the content-type of the response by doing:

Google does something similar, except they use //... + \n (e.g. http://www.google.com/calendar/feeds/developer-calendar@google.com/public/full?alt=json&callback=foo)