Plack::Middleware::JSONP - Wraps JSON response in JSONP if callback parameter is specified
enable "JSONP", callback_key => 'jsonp';
Plack::Middleware::JSONP wraps JSON response, which has Content-Type value either
application/json as a JSONP response which is specified with the
callback query parameter. The name of the parameter can be set while enabling the middleware.
This middleware only works with an application response with content body set as a single element array ref and doesn't touch the response otherwise.