Symfony Controller - How to return XML response?

If you have many XmlResponse to return, consider creating your own Response object:

<?php

namespace App\Component\HttpFoundation;

use Symfony\Component\HttpFoundation\Response;

class XmlResponse extends Response
{
    public function __construct(?string $content = '', int $status = 200, array $headers = [])
    {
        parent::__construct($content, $status, array_merge($headers, [
            'Content-Type' => 'text/xml',
        ]));
    }
}

You can then return new XmlResponse($xmlBody); in your controllers.

Try adding correct header on the Response Object like:

$response->headers->set('Content-Type', 'text/xml');

Otherwise add the correct annotation (defaults) on your Controller method like this example:

 /**
  * @Route("/hello/{name}", defaults={"_format"="xml"}, name="_demo_hello")
  * @Template()
  */
  public function helloAction($name)
  {
     return array('name' => $name);
  }

Look at the guide for further explaination