Remove blank line when render view in CI4

Thanks you all for you help, i solved the problem,  I tried you guys solution but it isn't worked!
i shared my solution here in case that someone may face the same problem

First in the controller i replace the extend
From:

Code:

class Rss extends BaseController

To:

PHP Code:

use CodeIgniter\Controller;

class Rss extends Controller 


Second i remove the header function in the view file
Finally fix the index function in the controller use CI response->setheader + setBody for this

PHP Code:

    public function index()
    {
        $postData = model(PostModel::class)
            ->join('post_content', 'post_content.post_id = post.id', 'LEFT')
            ->where('lang_id', $this->lang->id)
            ->where('post_status', 'publish')
            ->where('post_type', PostTypeEnum::POST)
            ->orderBy('post.id', 'desc')
            ->select('post.id, post.user_init, post.post_type, post.created_at, post_content.title, post_content.slug, post_content.description')
            ->findAll(500);

        // add posts to the feed
        foreach ($postData as $post) { //dd($post->author);
            $this->feeds->add($post->title, $post->url, $post->created_at, $post->author, $post->slug, $post->description, $post->categories);
        }

        $this->response->setHeader('Content-Type', 'application/xml;charset=UTF-8');
        $html = view('rss', $this->feeds->getData(), ['debug' => false]);
        return $this->response->setBody($html);
    }