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public function sendFileAction()
{
    $jar       = new \GuzzleHttp\Cookie\SessionCookieJar('SESSION_STORAGE', true);
    $handler   = new CurlHandler();
    $stack     = HandlerStack::create($handler);
    $client    = new Client(['cookies'=>true, 'handler' => $stack]);
    $filename  = 'files/huge-1gig-file.jpg';
    $filesize  = filesize($filename);
    $fh        = fopen($filename, 'r');
    $chunkSize = 1024 * 2000;
    $boundary  = '----iCEBrkUploaderBoundary' . uniqid();
    $url       = 'https://localhost/app_dev.php/_uploader/bigupload/upload';

    rewind($fh); // probably not necessary
    while (! feof($fh)) {
        $pos   = ftell($fh);
        $chunk = fread($fh, $chunkSize);
        $calc  = $pos + strlen($chunk)-1;

        // Not sure if this is needed.
        //if (ftell($fh) > $chunkSize) {
        //    $pos++;
        //}

        $request = $client->request(
            'POST',
            $url,
            [
                'cookies' => $jar,
                'debug'   => false,
                'verify'  => false,
                'headers' => [
                    'Transfer-Encoding'   => 'chunked',
                    'Accept-Encoding'     => 'gzip, deflate, br',
                    'Accept'              => 'application/json, text/javascript, */*; q=0.01',
                    'Connection'          => 'keep-alive',
                    'Content-disposition' => 'attachment; filename="' . basename($filename) . '"',
                    'Content-length'      => $calc - $pos,
                    'Content-Range'       => 'bytes ' . $pos . '-' . $calc . '/' . $filesize
                ],
                'multipart' => [
                    [
                        'name'     => 'api_key,
                        'contents' => 'aaabbbcc-deff-ffed-dddd-1234567890123'
                    ],
                    [
                        'name'     => 'file',
                        'contents' => $chunk,
                        'filename' => basename($filename),
                        'headers' => [
                            'Content-Type' => 'multipart/form-data; boundary=' . $boundary
                        ]
                    ]
                ]
            ]
        );
    }

    return new Response('ok', 200);
}