从.net核心web应用程序接口中的URL下载大文件

[HttpGet]
public async Task<IActionResult> DownloadFile()
{
    string fileUrl = "https://example.com/largefile.zip"; // 要下载的文件URL

    using (HttpClient client = new HttpClient())
    {
        using (HttpResponseMessage response = await client.GetAsync(fileUrl))
        {
            if (response.IsSuccessStatusCode)
            {
                using (Stream fileStream = await response.Content.ReadAsStreamAsync())
                {
                    // 将文件保存到本地
                    using (FileStream outputStream = new FileStream("path/to/save/file.zip", FileMode.Create))
                    {
                        await fileStream.CopyToAsync(outputStream);
                    }

                    // 或者直接返回给客户端进行下载
                    return File(fileStream, "application/octet-stream", "file.zip");
                }
            }
            else
            {
                // 处理下载失败的情况
                return BadRequest("Failed to download file.");
            }
        }
    }
}