Csharp 返回下载文件流而不将其分配到内存(如果可能)

我有一个Web API端点，它通过首先下载文件，然后返回字节数组来为我提供文件.

此代码可以工作，但会首先将整个文件(无论它有多大)加载到内存中.

有没有办法简单地返回与我用来下载httpClient文件的流相同的流？

工作代码的简化示例:

[HttpGet("file")]
public async Task<IActionResult> DownloadFile(string url)
{
    using var httpClient = new HttpClient();
    using var response = await httpClient.GetAsync(url);
    if (response.IsSuccessStatusCode)
    {
        var content = await response.Content.ReadAsByteArrayAsync();

        var cd = new System.Net.Mime.ContentDisposition
        {
             FileName = "myFile.pdf",

             // always prompt the user for downloading, set to true if you want 
             // the browser to try to show the file inline
             Inline = false, 
        };
                
        Response.Headers.Add("Content-Disposition", cd.ToString());
                
        var mediaType = response.Content.Headers.ContentType.MediaType;

        return File(content, mediaType);
    }

    return NotFound();
}

我已经try 过的(也算是有效的):

using var httpClient = new HttpClient();
using var response = await httpClient.GetAsync(url);
if (response.IsSuccessStatusCode)
{
   using (var content = await response.Content.ReadAsStreamAsync())
   {
      content.Position = 0;

      var cd = new System.Net.Mime.ContentDisposition
      {
         FileName = "myFile.pdf",

         // always prompt the user for downloading, set to true if you want 
         // the browser to try to show the file inline
         Inline = false,
      };

      Response.Headers.Add("Content-Disposition", cd.ToString());

      var mediaType = response.Content.Headers.ContentType.MediaType;

      return File(content, mediaType);
}

但这给了我ObjectDisposedException: cannot access a closed stream美元.

请问有什么办法可以完成我想做的事吗？