post in ios app swift 3.swift

// prepare json data
        let mapDict = [ "1":"First", "2":"Second"]
        
        let json = [ "title":"ABC" , "dict": mapDict ] as [String : Any]
        let jsonData = try? JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
        
        // create post request
        let url = NSURL(string: "https://httpbin.org/post")!
        let request = NSMutableURLRequest(url: url as URL)
        request.httpMethod = "POST"
        
        // insert json data to the request
        request.httpBody = jsonData
        
        
        let task = URLSession.shared.dataTask(with: request as URLRequest){ data,response,error in
            if error != nil{
                print(error?.localizedDescription)
                return
            }
            if let responseJSON = try? JSONSerialization.jsonObject(with: data!) as? [String:AnyObject]{
                print(responseJSON)
            }
        }
        
        task.resume()