Aerys\Root::doRangeResponse PHP Method

    private function doRangeResponse($range, $fileInfo, Response $response)
    {
        $this->assignCommonHeaders($fileInfo, $response);
        $range->contentType = $mime = $this->selectMimeTypeFromPath($fileInfo->path);
        if (isset($range->ranges[1])) {
            $response->setHeader("Content-Type", "multipart/byteranges; boundary={$range->boundary}");
        } else {
            list($startPos, $endPos) = $range->ranges[0];
            $response->setHeader("Content-Length", (string) ($endPos - $startPos + 1));
            $response->setHeader("Content-Range", "bytes {$startPos}-{$endPos}/{$fileInfo->size}");
            $response->setHeader("Content-Type", $mime);
        }
        $response->setStatus(HTTP_STATUS["PARTIAL_CONTENT"]);
        return $this->finalizeResponse($response, $fileInfo, $range);
    }