Why is the page not downloaded on the server, but downloaded from the local one with the same proxy?

Question

Parsing

$url = 'https://site.ru';
$img = curl_get_contents($url, '', '', 'https://site.ru');
echo $img['code'];
file_put_contents(__DIR__ . '/1.jpg', $img['exec']);

function curl_get_contents($url, $proxy = false, $proxyuserpwd = false, $referer = 'https://www.google.com/', $timeout = 10, $useragent = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36')
{
    $headers = [
        'accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
        'accept-language: ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7,de;q=0.6',
        'cache-control: no-cache',
        'pragma: no-cache'
    ];
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_REFERER, $referer);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_USERAGENT, $useragent);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_PROXY, $proxy);
    curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyuserpwd);

    $return['exec'] = curl_exec($ch);
    $return['code'] = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
    $return['info'] = curl_getinfo($ch);
    return $return;
}

I insert the same proxy (I removed it here), it does not work on the server, but it works on the local computer.
I checked it in browser and console.