Context

Example 1

I have this code in a controller:

$site = $siteRepository
    ->findOneBy([
        'apiSiteParameter' => $api_site_parameter,
    ])
;

if (!$site instanceof Site) {
    throw $this->createNotFoundException('No site found');
}

I tested this exception with something like this:

// the database is empty

$this->testClient->request('GET',  '/badges/fooooo');

self::assertPageTitleContains('No badge found (404 Not Found)');

But after I upgraded to Symfony 7.4.0, I can’t test the <title> anymore, I replaced it with self::assertResponseStatusCodeSame(404); because the <title> wasn’t available anymore.

Example 2

It’s also visible in this PHPUnit test: https://github.com/liip/LiipFunctionalTestBundle/actions/runs/19837319935/job/56837621771

There is a test controller that do only this: throw new \Exception('foo');

And before Symfony 7.4, foo was visible in <title>. Now the error page returns a text stack trace instead of a HTML page.

I had to add extra code to cover this case:

• liip/LiipFunctionalTestBundle@d0ee84d

Question

What commit, PR, etc. changed this behaviour? I tried to search for HTTP and exceptions in https://github.com/symfony/symfony/blob/7.4/CHANGELOG-7.4.md and https://github.com/symfony/symfony/blob/7.4/UPGRADE-7.4.md but I’m probably missing the right keyword.

Can the old behaviour be restored with some conf?

So far, it looks like it’s due to the VarDumper component but it can’t find more information.