cordova file transfer does not download and shows no console errors

I'm using Framework7, and generating a pdf file using laravel 4.2 but when I click on the button it shows me the following error in console:

  

Download complete:   file: ///data/user/0/com.aotour.driver/files/constancia_99469.pdf

and do not download anything, this is my code

$$('button').click(function(){

  var servicio_id = $$(this).attr('data-id');

  var fileTransfer = new FileTransfer();

  var uri = encodeURI(urlserver+"descargarconstancia/"+servicio_id);

  var fileURL = cordova.file.dataDirectory+'constancia_'+servicio_id+'.pdf';

  fileTransfer.download(
    uri,
    fileURL,
    function(entry) {
      console.log("download complete: " + entry.toURL());
    },
    function(error) {
      console.log("download error source " + error.source);
      console.log("download error target " + error.target);
      console.log("download error code" + error.code);
    },
    false,
    {
      headers: { 
          "Authorization": token
      }
    }
  );

});

Laravel code

Route::get('descargarconstancia/{id}', function($id){

  $servicio = Servicio::find($id);

  $pdfName = 'constancia_'.$servicio->id.'.pdf';

  $pdfPath = 'biblioteca_imagenes/constancias/';

  $view = View::make('servicios.plantilla_constancia_vieja')->with(['servicio' => $servicio]);

  $view = preg_replace('/>\s+</', '><', $view);

  File::put($pdfPath.$pdfName, PDF::load($view, 'A4', 'portrait')->output());

  header("Content-type:application/pdf");

  return Response::download($pdfPath.$pdfName);

});