How can I define Content-type in Swift using NSURLSession

Question

I want to set content-type in my below code to call web api. Content-type will be application/json; charset=utf-8

let url = NSURL(string: "http:/api/jobmanagement/PlusContactAuthentication?email=\(usr)&userPwd=\(pwdCode)")  println("URL:  \(url)")  let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {     (data, response, error) in     println(NSString(data: data, encoding: NSUTF8StringEncoding)) }  //  task.setValue(<#value: AnyObject?#>, forKey: <#String#>) task.resume() 

Answer 1

If you want to set the Content-Type of the request, you can create your own URLRequest, supplying your URL, specify the Content-Type header using setValue(_:forHTTPHeaderField:) and then issue the request with the URLRequest instead of the URL directly. And just set the httpBody to be that JSON and specify the httpMethod of POST:

let url = URL(string: "https://api/jobmanagement/PlusContactAuthentication")! var request = URLRequest(url: url) request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")  // the request is JSON request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")        // the expected response is also JSON request.httpMethod = "POST"  let dictionary = ["email": username, "userPwd": password] request.httpBody = try! JSONEncoder().encode(dictionary)  let task = URLSession.shared.dataTask(with: request) { data, response, error in     guard let data = data, error == nil else {         print(error ?? "Unknown error")                                 // handle network error         return     }      // parse response; for example, if JSON, define `Decodable` struct `ResponseObject` and then do:     //     // do {     //     let responseObject = try JSONDecoder().decode(ResponseObject.self, from: data)     //     print(responseObject)     // } catch let parseError {     //     print(parseError)     //     print(String(data: data, encoding: .utf8))   // often the `data` contains informative description of the nature of the error, so let's look at that, too     // } } task.resume() 

For Swift 2 rendition, see previous revision of this answer.