Правильный способ обслуживания двоичных данных и частичного содержимого с помощью Zend Framework 2

Это работает для рендеринга pdf в браузере (например, PDFJS), потоковой передачи видео в формате mp4 или загрузки файла.

$headers = new \Zend\Http\Headers();
$headers->addHeaderLine('Content-Type', $type)
        ->addHeaderLine('Cache-Control', 'must-revalidate')
        ->addHeaderLine('Pragma', 'public');
$response = new \Zend\Http\Response();

$downloadFile = false | true; // <-- Change this

if($downloadFile) {
    $headers->addHeaderLine('Content-Disposition', 'attachment; filename="' . $fileName . '"')
            ->addHeaderLine('Content-Length', $size);
    // ->addHeaderLine('Set-Cookie', 'fileDownload=true; path=/');

    $response = new \Zend\Http\Response\Stream();
    $response->setStream(fopen($pathFile, 'r'));

    $response->setHeaders($headers);

    return $response;
}

$size  = filesize($pathFile);
$start = 0;
$end   = $size - 1;
$buffer = 1024000;

// Get the 'Range' header if one was sent
if (isset($_SERVER['HTTP_RANGE'])) {
    $range = $_SERVER['HTTP_RANGE']; // IIS/Some Apache versions
} else if ($apache = apache_request_headers()) { // Try Apache again
    $arrHeaders = array();
    foreach ($apache as $header => $val) {
        $arrHeaders[strtolower($header)] = $val;
    }
    if (isset($arrHeaders['range'])) {
        $range = $arrHeaders['range'];
    } else {
        $range = false; // We can't get the header/there isn't one set
    }
} else {
    $range = false; // We can't get the header/there isn't one set
}

// Get the data range requested (if any)
$size = filesize($pathFile);
if ($range) {
    $partial = true;
    list($param,$range) = explode('=',$range);
    if (strtolower(trim($param)) != 'bytes') { // Bad request - range unit is not 'bytes'
        $response->setStatusCode(400);  // 400 Invalid Request
        exit;
    }
    $range = explode(',',$range);
    $range = explode('-',$range[0]); // We only deal with the first requested range
    if (count($range) != 2) { // Bad request - 'bytes' parameter is not valid
        $response->setStatusCode(400);  // 400 Invalid Request
        exit;
    }
    if ($range[0] === '') { // First number missing, return last $range[1] bytes
        $end = $size - 1;
        $start = $end - intval($range[1]);
    } else if ($range[1] === '') { // Second number missing, return from byte $range[0] to end
        $start = intval($range[0]);
        $end = $size - 1;
    } else { // Both numbers present, return specific range
        $start = intval($range[0]);
        $end = intval($range[1]);
        if ($end >= $size || (!$start && (!$end || $end == ($size - 1)))) {
            $partial = false; // Invalid range/whole file specified, return whole file
        }
    }
    $length = $end - $start + 1;
} else {
    $partial = false; // No range requested
    $length = $size;
}
// error_log(var_export(array($range, $partial, $length), true));

// Send standard headers
$headers->addHeaderLine("Content-Length", $length);
$headers->addHeaderLine("Accept-Ranges", "bytes");

// if requested, send extra headers and part of file...
if ($partial) {
    $response->setStatusCode(206);  // 206 (Partial Content)
    $headers->addHeaderLine("Content-Range", "bytes $start-$end/".$size);
    if (!$fp = fopen($pathFile, 'r')) { // Error out if we can't read the file
        $response->setStatusCode(500);  // 500 Internal Server Error
        exit;
    }
    if ($start) {
        fseek($fp,$start);
    }
    $out = '';
    while ($length) { // Read in blocks of 8KB so we don't chew up memory on the server
        $read = ($length > 8192) ? 8192 : $length;
        $length -= $read;
        $out .= fread($fp,$read);
    }
    fclose($fp);
} else {
    $out = readfile($pathFile); // ...otherwise just send the whole file
}

$response->setContent($out);

$response->setHeaders($headers);

return $response;