从MemoryStream发送zip文件时，HTTP响应无效

我试图在内存中创建一个zip文件，从文件流中读取多个其他zip文件。它似乎能够正确读取文件，并创建一个zip文件；然而，当创建响应时，所有内容头都被放入invalidHeaders中。这导致下载永远不会发生，而是加载了一个错误的响应页面。

using (var memoryStream = new MemoryStream())
{
    // Gather all zips into a single zip file 
    using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
    {
        foreach(var zipFile in zipFiles)
        {
            archive.CreateEntryFromFile(zipFile.ZipFilePath, Path.GetFileName(zipFile.ZipFilePath));
        }             
    }
    // Now we have our memory stream with our zip
    HttpResponseMessage message = new HttpResponseMessage(HttpStatusCode.OK);
    message.Content = new StreamContent(memoryStream);
    message.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
    message.Content.Headers.ContentDisposition.FileName = "AllZIPFiles.zip";
    message.Content.Headers.ContentType = new MediaTypeHeaderValue("application/zip");
    message.Content.Headers.ContentLength = memoryStream.Length;
    // Content headers placed into invalidHeaders?
    return ResponseMessage(message);
}