POST request

Request.swift

    typealias PostCompletionHandler = (NSDictionary) -> ()
    
    static func post(postUrl: String, body: [String: AnyObject], completionHandler: @escaping (PostCompletionHandler)){
        
        let url = URL(string:postUrl)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")    // Set as JSON content-type
        request.addValue("application/json", forHTTPHeaderField: "Accept")
        if(body.count > 0){
            do {
                request.httpBody = try JSONSerialization.data(withJSONObject: body, options: .prettyPrinted)
            } catch let error {
                print(error.localizedDescription)
            }
        }
        
        let task = URLSession.shared.dataTask(with: request as URLRequest) { data,response,error in
            if error != nil{
                print(error?.localizedDescription ?? "Error")
                return
            }
            
            
            do {
                let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
                if json != nil {
                    completionHandler(json!)
                }
            } catch let error as NSError {
                print(error)
            }
        }
        
        task.resume()
    }