public function getNormalizeResponseChunkSize() : int
    {
        $chunkSize      = $this->getConfiguration('responseChunkSize', static::DEFAULT_CHUNK_SIZE);
        $chunkSize      = ! is_numeric($chunkSize) ? static::DEFAULT_CHUNK_SIZE : intval(abs($chunkSize));
        $chunkSize      = $chunkSize < 512 ? 512 : $chunkSize;
        return $chunkSize;
    }