Erreur connexion API

Bonjour à tous !

Lorsque je me connecte à mon API (que j'ai créé avec PHP), j'obtiens l'erreur suivante :
HTTP load failed (error code: 53

Voici les fonctions que j'utilise pour me connecter :

func APIRequest<T>(data: T?, response: URLResponse?, error: Error?) throws -> T {
    if let error = error { throw error }
    guard let response = response as? HTTPURLResponse else { throw ServerRequestError.badRequest }
    let statusCode = response.statusCode
    guard statusCode == 200 else { throw ServerRequestError.serverError(code: statusCode) }
    guard let data = data else { throw ServerRequestError.noData }
    return data
}

func APIRequestPost(url: APIurl, postString: String, completion: @escaping (Data) -> ()) {
    var request = URLRequest(url: URL(string: url.rawValue)!)
    request.cachePolicy = .reloadIgnoringLocalCacheData
    request.httpMethod = "POST"
    request.httpBody = postString.data(using: String.Encoding.utf8)

    let requestAPI = URLSession.shared.dataTask(with: request) { data, response, error in
        do {
            let resultRequest = try self.APIRequest(data: data, response: response, error: error)
            completion(resultRequest)
        } catch {
            NSLog(error.localizedDescription)
            print(url)
            print(error.localizedDescription)
        }
    }
    requestAPI.resume()
}

Et voici la fonctions qui me permet de récupérer les rendez-vous :

func getNewAppointment() {
    guard AppDelegate.customer != nil else { return }
    //var newAppointments: [[String:Any]] = []

    serverRequest.APIRequestGot(url: "monfichier.json", completion: { (newAppointments: [[String:Any]]) in
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            guard newAppointments.count > 0 else { return }
            self.badgesAppointments = newAppointments.count
            let dataBase = DataBase()
            for newAppointment in newAppointments {
                let appointment: NewAppointment = NewAppointment.init(dictionary: newAppointment)!
                let predicate: String = "id == \(appointment.idTogether) AND idArtisan == \(appointment.idArtisan)"
                var appointments: [Appointment] = []
                dataBase.getAppointment(predicatFormat: predicate, completion: { result in
                    appointments = result
                })
                print("idTogether : \(appointment.idTogether)")
                if appointments.count > 0 {
                    var archive: Bool = true
                    var newState: Int32 = appointment.state
                    if appointment.state == 3 {
                        newState = 2
                        archive = false
                    }
                    dataBase.updateAppointment(predicatFormat: predicate, comment: appointment.comment, price: appointment.price, date: appointment.schelude, state: newState, archive: archive)
                } else {
                    var idAppointment: Int32 = 1
                    dataBase.getLastIdAppointment(idArtisan: appointment.idArtisan, completion: { result in
                        idAppointment = result
                    })
                    dataBase.addAppointment(id: appointment.idTogether, idChat: appointment.idChat, idArtisan: appointment.idArtisan, comment: appointment.comment, price: appointment.price, address: appointment.address, date: appointment.schelude, service: appointment.service, state: Int32(2), archive: false)

                    if idAppointment < appointment.idTogether {
                        dataBase.updateIdAppointment(idArtisan: Int32(appointment.idArtisan), id: appointment.idTogether)
                    }
                }
            }
            switch AppDelegate.viewController {
            case "OrganizerViewController":
                break
            case "AppointmentViewController":
                let appointmentViewController = AppointmentViewController()
                if AppDelegate.idTogether != appointmentViewController.idTogether {
                    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "updateBadgesAppointments"), object: nil)
                } else {
                    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "reloadAppointment"), object: nil)
                }
                break
            default:
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "updateBadgesAppointments"), object: nil)
                break
            }
            NotificationCenter.default.post(name: NSNotification.Name(rawValue: "loadAppointments"), object: nil)

        }
    })
    self.updateBadge(type: "A")
}

Je vous remercie pour votre aide !