Hands-On Design Patterns with Swift

Sending requests with Encodable

The counterpart to Decodable is Encodable; an object that conforms to both Encodable and Decodable is Codable. Now that you have seen how to download data from a server and parse it into a pure Swift object, you'll probably want to send data to the server from pure Swift objects:

func post<T, U>(url: URL, body: U, callback: @escaping (T?, Error?) -> Void) throws     -> URLSessionTask where T: Decodable, U: Encodable {    var request = URLRequest(url: url)    request.httpBody = try JSONEncoder().encode(body)    request.httpMethod = "POST"    let task = URLSession.shared.dataTask(with: request) { data, response, error in        // Exact same code as in the get<T> callback, extracted        handleResponse(data: data,  response: response, ...