responsebuilder.php

См. документацию.

<?php

 
namespace Bitrix\Main\Web\Http;
 
use Bitrix\Main\Web\HttpHeaders;
 
class ResponseBuilder implements ResponseBuilderInterface
{
    public function createFromString(string $response): Response
    {
        $headers = HttpHeaders::createFromString($response);
        $body = $this->createBody();
 
        if (strtolower($headers->get('Transfer-Encoding') ?? '') == 'chunked')
        {
            $body = new DechunkStream($body);
        }
 
        if (strtolower($headers->get('Content-Encoding') ?? '') == 'gzip')
        {
            $body = new InflateStream($body);
        }
 
        return new Response($headers->getStatus(), $headers->getHeaders(), $body, $headers->getVersion(), $headers->getReasonPhrase());
    }
 
    protected function createBody(): Stream
    {
        return new Stream('php://temp', 'r+');
    }
}