HttpResponseMessage download file and zip

Download.cs

private static HttpResponseMessage HttpReport(byte[] bytes, string fileName)
{
    HttpResponseMessage httpResponseMessage;
    using (var stream = new MemoryStream(bytes))
    {
        httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new ByteArrayContent(stream.ToArray())
        };

        httpResponseMessage.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
        {
            FileName = fileName
        };

        httpResponseMessage.Content.Headers.ContentType =
            new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
    }

    return httpResponseMessage;
}

private static HttpResponseMessage HttpZip(Dictionary<string, byte[]> reports)
{
    HttpResponseMessage httpResponseMessage;
    using (var stream = new MemoryStream())
    {
        using (var zipArchive = new ZipArchive(stream, ZipArchiveMode.Update, false))
        {
            foreach (var report in reports)
            {
                ZipArchiveEntry zipEntry = zipArchive.CreateEntry(report.Key);

                using (var fileStream = new MemoryStream(report.Value))
                {
                    using (Stream zipStream = zipEntry.Open())
                    {
                        fileStream.CopyTo(zipStream);
                    }
                }
            }
        }

        httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new ByteArrayContent(stream.ToArray())
        };

        httpResponseMessage.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
        {
            FileName = $"Reports-{DateTime.UtcNow}.zip"
        };

        httpResponseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("application/zip");
    }

    return httpResponseMessage;
}