SSDM-13781 : V3 API: Response parsing error - set content type to avoid...

SSDM-13781 : V3 API: Response parsing error - set content type to avoid unintended replacement of "??" done by jquery which did that because it assumed it was a jsonp call where "??" represent a callback (for more details see: https://stackoverflow.com/questions/5707619/uncomprehensible-jquery-ajax-behavior-when-data-contains-consecutive-questio)