During error there is no response. At normal conditions it gives a set of codes that are as follows
{
"products": [
],
"discounts": [
],
"shippingCost": "Rs. 0.00",
"shippingCostFloat": "0",
"taxCost": "Rs. 0.00",
"wrappingCost": "Rs. 0.00",
"nbTotalProducts": "0",
"total": "Rs. 0.00",
"productTotal": "Rs. 0.00",
"hasError" : false
}
I am attaching both images for better understanding.