Cakephp3 e TCPDF

composer require tecnickcom/tcpdf

 public function initialize()
    {
        parent::initialize();
        $this->loadComponent('RequestHandler');
    }

    public getPdf index()
    {
        $this->viewBuilder()->setLayout('ajax');
        $this->RequestHandler->respondAs('pdf', [
            // Decommentare per forzare il download
            //'attachment' => true,
            'charset' => 'UTF-8'
        ]);
    }

<?php
//============================================================+
// File name   : example_002.php
// Begin       : 2008-03-04
// Last Update : 2013-05-14
//
// Description : Example 002 for TCPDF class
//               Removing Header and Footer
//
// Author: Nicola Asuni
//
// (c) Copyright:
//               Nicola Asuni
//               Tecnick.com LTD
//               www.tecnick.com
//               info@tecnick.com
//============================================================+

/**
 * Creates an example PDF TEST document using TCPDF
 * @package com.tecnick.tcpdf
 * @abstract TCPDF - Example: Removing Header and Footer
 * @author Nicola Asuni
 * @since 2008-03-04
 */

// Include the main TCPDF library (search for installation path).
require_once('tcpdf_include.php');

// create new PDF document
$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

// set document information
$pdf->SetCreator(PDF_CREATOR);
$pdf->SetAuthor('Nicola Asuni');
$pdf->SetTitle('TCPDF Example 002');
$pdf->SetSubject('TCPDF Tutorial');
$pdf->SetKeywords('TCPDF, PDF, example, test, guide');

// remove default header/footer
$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);

// set default monospaced font
$pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);

// set margins
$pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);

// set auto page breaks
$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);

// set image scale factor
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);

// set some language-dependent strings (optional)
if (@file_exists(dirname(__FILE__).'/lang/eng.php')) {
    require_once(dirname(__FILE__).'/lang/eng.php');
    $pdf->setLanguageArray($l);
}

// ---------------------------------------------------------

// set font
$pdf->SetFont('times', 'BI', 20);

// add a page
$pdf->AddPage();

// set some text to print
$txt = <<<EOD
TCPDF Example 002

Default page header and footer are disabled using setPrintHeader() and setPrintFooter() methods.
EOD;

// print a block of text using Write()
$pdf->Write(0, $txt, '', 0, 'C', true, 0, false, false, 0);

// ---------------------------------------------------------

//Close and output PDF document
$pdf->Output('example_002.pdf', 'I');

//============================================================+
// END OF FILE
//============================================================+