title: post application/x-www-form-urlencoded Alamofire
body: <p>I want to use Alamofire to retrieve a bearer token from Web API but I am new to ios and alamofire. How can I accomplish this with Alamofire?</p>
  
  <pre><code>func executeURLEncodedRequest(url: URL, model: [String : String]?, handler: RequestHandlerProtocol) {
      addAuthorizationHeader()
      Alamofire.request(.POST,createUrl(url), parameters: model, headers: headers,encoding:.Json)
  }
  </code></pre>