WEB API：客户端已断开连接

Question

我正在编写控制器来复制FileStream内容，我在下面的行中收到错误The Client Disconnected，

await Request.Content.CopyToAsync(fs);

可能是什么原因？

public async Task<IHttpActionResult> Post()
    {
        try
        {
            string path = @"C:\Test";

            using (FileStream fs = new FileStream(path, FileMode.CreateNew, FileAccess.Write))
            {
                await Request.Content.CopyToAsync(fs);
            }

            return Ok<bool>(true);
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }