Minimal working example to reproduce a guzzle issue with rss.kicker.de/news/2bundesliga

kicker_guzzle.php

<?php

require_once __DIR__ . '/vendor/autoload.php';

$stream =

$client = new GuzzleHttp\Client([
    //'handler' => new \GuzzleHttp\Handler\CurlHandler(), // body size: 0
    'handler' => new \GuzzleHttp\Handler\StreamHandler(), // body size: 25965
]);

$response = $client->get(
    'http://rss.kicker.de/news/2bundesliga',
    [
        'debug' => true,
    ]
);

echo 'Status code: ' . $response->getStatusCode() . "\n";
echo 'Body size: ' . $response->getBody()->getSize() . "\n";