Формирование PDF (DomPDF) с помощью ajax

$.ajax({ 
  url:  URL_OUTPUT_API , 
  type: "POST", 
  data: { 
      action: "create_pdf", 
      mode: MODE_TYPES_PDF.newPDF, 
      CALC_INF: CALC_INF, 
      structureB: structureB, 
      structureC: structureC 
  }, 
  success: function(pdf) { 
    console.log("url->",pdf); 
    window.open(pdf, "_blank"); 
  } 
});

if ($_POST["action"] == "create_pdf") { 
   require_once("dompdf/dompdf_config.inc.php"); 
   $dompdf = new DOMPDF(); 
   ob_start(); 
   require "template.php"; 
    $dompdf->load_html(ob_get_clean()); 
    $dompdf->set_Paper("A4", "portrait"); 
    $dompdf->render(); 
    $dompdf->stream('mypdf.pdf'); 
}