REQUEST:
http://en.wikipedia.org/w/api.php?action=opensearch&search=JFK&format=json&callback=zzz
RESPONSE:
/**/zzz(
[
"JFK",
[
"JFK",
"JFK (film)",
"JFK Olimps",
"JFK Express",
"JFK: Reloaded",
"JFK in Ireland",
"JFK Expressway",
"Jfk",
"JFK (disambiguation)",
"JFK/UMass (MBTA station)"
]
]
)Invalid part: /**/zzz(
Please note that replacing 'callback' with other invalid argument changes response to contain a warning inside of the valid json.
So the side issue is: Why undocumented 'callback' argument is treated differently compared to other invalid arguments?