HTTP with URLSession

URLSession is a class that manages tasks related to network data transfers. You use URLSession when you want to download or upload data to an HTTP server.

Combined with Codable types, URLSession provides a very convenient abstraction over your network requests, if you're using a JSON-based API, for example. In this section, we'll look at how we can use Encodable and Decodable to represent request and responses bodies in a generic and compile time-safe manner.

Making your first call with URLSession

Let's take a look at the anatomy of a simple URL task:

let url = URL(string: "https://api.website.com/")!
let task  = URLSession.shared.dataTask(url: url) { data, response, error in 
 ...