Empty line at the beginning of file

Kirby 3
#1

I have a route that returns a snippet to generate my xml feed

The route is as simple as this:
return new Response(snippet('rss', [] , true), 'application/rss+xml');

While the snippet itself is just a simple snippet to generate the feed. I’ll include only the first three lines since those are the ones relevant to the problem:

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
    <channel>

I’m trying to figure out why the generate file I get in return has an empty line at the beginning
The screen is from the generated file I get doing a wget on the route and there’s the empty line at the beginning.
Screenshot 2022-08-22 at 11.52.31 AM

#2

If you look at this example from the sitemap cookbook recipe, the first line in the snippet is echoed via PHP, probably exactly to prevent such issues?

<?= '<?xml version="1.0" encoding="utf-8"?>'; ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    <?php foreach ($pages as $p): ?>
        <?php if (in_array($p->uri(), $ignore)) continue ?>
        <url>
            <loc><?= html($p->url()) ?></loc>
            <lastmod><?= $p->modified('c', 'date') ?></lastmod>
            <priority><?= ($p->isHomePage()) ? 1 : number_format(0.5 / $p->depth(), 1) ?></priority>
        </url>
    <?php endforeach ?>
</urlset>
#3

So that results in this

Screenshot 2022-08-22 at 1.11.04 PM

#4

Hm, I somehow cannot reproduce this issue. Make sure you have no hidden chars in your snippet.

#5

So, here’s the thing: it doesn’t happen on my local machine but it does happen on the live site.

#6

And I noticed that the same thing happens with the json version of the feed. And on there I don’t even have a snippet. I’m just returning an array from the route.

#7

Check if any PHP file of your site has an empty line before or after the PHP tags. If it only occurs on the live server, maybe try redeploying everything.

#8

Checked everything. No empty lines anywhere at the beginning or at the end of the files. Also everything is synced automatically via git and redeploying didn’t change anything unfortunately.