Requester+DefaultBehaviour.swift

extension Requester {
    
    public static func execute<T: Codable>(ofType: T.Type, request : Request,
                                           completion: @escaping
        (_ result: HTTPResult<T?,HTTPCallErrorType<Error>?>) -> Void) {
        // first we create the URLRequest
        if let httpRequest = createRequest(from: request) {
            // we use the nativ URL session to exute it
            URLSession.shared.dataTask(with: httpRequest) { (data, response, error) in
                if let error = error {
                    // first error to handle when we have a request error                                           
                    completion(HTTPResult.failure(HTTPCallErrorType.responseError(error)))
                } else {
                    // callback to main thread 
                    DispatchQueue.main.async {
                        if let data = data {
                            do {
                                // trying to map the data to the Generic codable type
                                let object = try JSONDecoder().decode(T.self, from: data)
                                completion(HTTPResult.success(object))
                                return
                            } catch let error {
                                // second error to hanle mapping error, data not conform to the object
                                completion(HTTPResult.failure(HTTPCallErrorType.mappingError(error)))
                                return
                            }
                        }
                        // error data is nil
                        completion(HTTPResult.failure(HTTPCallErrorType.dataError))
                    }
                }
                }.resume()
        } else {
            completion(HTTPResult.failure(HTTPCallErrorType.urlError))
        }
    }
}