Data fetched via postman and URLSession is different in here http://173.249.20.137:9000/apiapp/coupon - swift

Question

http://173.249.20.137:9000/apiapp/coupon GET method .
when I request via URLSession and Postman I get two different results. Actually postman data is correct, but the URL session has always the same response whether I add or delete data it is not going to update. Can anybody please give a look. if it is happening with me only or something wrong at the backend server.
I have tested requesting data with URLSession.shared and postman.
I actually like to have the data I get via postman through URLSession request too.
func getAvailableCoupons(urlString:String, completion: #escaping (_
product: Any, _ error: Error?) -> Void){
guard let url = URL(string: urlString) else {return}
let task = URLSession.shared.dataTask(with: url) { (data, response,
error) in
let jsonDecoder = JSONDecoder()
guard let dataResponse = data,
error == nil else {
print(error?.localizedDescription ?? "Response Error")
return }
let statusCode = (response as! HTTPURLResponse).statusCode
let responseJSON = try? JSONSerialization.jsonObject(with: dataResponse, options: [])
if let responseJSON = responseJSON as? [String: Any] {
if statusCode == 200 {
do {
let jsonData = try JSONSerialization.data(withJSONObject: responseJSON, options: [])
let responseData = try jsonDecoder.decode(CoupensResponseModel.self, from:jsonData)
completion(responseData, nil)
} catch let error {
print("error when parshing json response \(error)")
completion(error, nil )
}
} else if statusCode == 404{
completion(" 404 not found", nil )
} else {
print("fatal error \(error?.localizedDescription ?? "big errror")")
}
}
}
task.resume()
}
import Foundation
// MARK: - CoupensResponseModel
struct CoupensResponseModel: Codable {
let couponDetails: [CouponDetail]?
enum CodingKeys: String, CodingKey {
case couponDetails = "coupon_details"
}
}
// MARK: - CouponDetail
struct CouponDetail: Codable {
let id: Int?
let vouchersusageSet: [VouchersusageSet]?
let couponCode: String?
let minimumSpend: Int?
let expiryDate, createdDate: String?
let discountPrice, discountPercent: Int?
let discountBasis: DiscountBasis?
let couponImage: String?
let couponType: String?
enum CodingKeys: String, CodingKey {
case id
case vouchersusageSet = "vouchersusage_set"
case couponCode = "coupon_code"
case minimumSpend = "minimum_spend"
case expiryDate = "expiry_date"
case createdDate = "created_date"
case discountPrice = "discount_price"
case discountPercent = "discount_percent"
case discountBasis = "discount_basis"
case couponImage = "coupon_image"
case couponType = "coupon_type"
}
}
enum DiscountBasis: String, Codable {
case amount = "amount"
case percent = "percent"
}
// MARK: - VouchersusageSet
struct VouchersusageSet: Codable {
let id: Int?
let itemObj: ItemObj?
let voucherObj: Int?
let sectionObj, categoryObj: Int?
}
// MARK: - ItemObj
struct ItemObj: Codable {
let id: Int?
let code, productName: String?
let productPrice, discountedPrice: Int?
let productDescription, itemImage: String?
let categoryObj: CouponCategoryObj?
enum CodingKeys: String, CodingKey {
case id, code
case productName = "product_name"
case productPrice = "product_price"
case discountedPrice = "discounted_price"
case productDescription = "product_description"
case itemImage = "item_image"
case categoryObj
}
}
// MARK: - CouponCategoryObj
struct CouponCategoryObj: Codable {
let id: Int?
let categoryCode, categoryName: String?
let categoryImage: CouponJSONNull?
let sectionObj: Int?
enum CodingKeys: String, CodingKey {
case id
case categoryCode = "category_code"
case categoryName = "category_name"
case categoryImage = "category_image"
case sectionObj
}
}
// MARK: - Encode/decode helpers
class CouponJSONNull: Codable, Hashable {
public static func == (lhs: CouponJSONNull, rhs: CouponJSONNull) ->
Bool {
return true
}
public var hashValue: Int {
return 0
}
public func hash(into hasher: inout Hasher) {
// No-op
}
public init() {}
public required init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
if !container.decodeNil() {
throw DecodingError.typeMismatch(CouponJSONNull.self,
DecodingError.Context(codingPath: decoder.codingPath,
debugDescription:
"Wrong type for CouponJSONNull"))
}
}
public func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encodeNil()
}
}

Answer 1

Try the following method
let headers = [
"Cache-Control": "no-cache",
]
let request = NSMutableURLRequest(url: NSURL(string: "http://173.249.20.137:9000/apiapp/coupon")! as URL,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
if (error != nil) {
print(error)
} else {
let string = String(data: data!, encoding: .utf8) ?? ""
print(string)
}
})
dataTask.resume()

Answer 2

Please look on response both are same.
Postman response :
https://jsoneditoronline.org/?id=7b94ef69a3344164aa4a96423fdbf9db
Code response :
https://jsoneditoronline.org/?id=6e5a7d221d9c4c818f1d46fc893031fe