Returned JSON object echoed back from PHP to AJAX (other methods are available) is of the structure:
success(response) {
var response = {
Headers: { ... },
Status: { Code: 200, Message: "OK" },
data: { ... }
}
}
Headers is only echoed back for debugging. Proper implementation is for the Headers object to be used within PHP for it's own internal logic e.g. for Caching control.