title: Swift - How to send POST request with "x-www-form-urlencoded" content-type
body: <p>I searched a lot and there's no clear instruction for sending POST request with &quot;x-www-form-urlencoded&quot; content-type.
  i want to know how to do that and if you know how to do it with Alamofire it would be even better.
  any help will be appreciated.</p>