Fine Uploader不断重试，ASP.Net不是MVC

Question

我正在使用Azure Web角色（而不是MVC）ApiController来接收FineUploader请求。它工作正常（！） - 文件成功上传 - 除了响应似乎不是客户期望的。我在控制器中使用PostFormData方法并调整了ASP.Net MVC示例代码。

这是服务器端代码：

    public async Task<HttpResponseMessage> PostFormData()
    {
        if (!Request.Content.IsMimeMultipartContent())
        {
            throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
        }
        string root = HttpContext.Current.Server.MapPath("~/App_Data");
        var provider = new MultipartFormDataStreamProvider(root);

        try
        {
            await Request.Content.ReadAsMultipartAsync(provider);

            // Show all the key-value pairs.
            foreach (var key in provider.FormData.AllKeys)
            {
                foreach (var val in provider.FormData.GetValues(key))
                {
                    Trace.WriteLine(string.Format("{0}: {1}", key, val));
                }
            }
            //what should this be? 
            HttpResponseMessage hm= Request.CreateResponse(HttpStatusCode.OK, new FineUploaderResult(true, new { extraInformation = 12345 }));
            return hm; 
        }
        catch (System.Exception e)
        {
            return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e);
        }
    }

我尝试过JSON序列化FineUploaderResult无效，并且尝试将该类的成员公开，以便JsonConvert.SerializeObject()包含它们。但是客户端不喜欢这样的东西。

编辑：这是Chrome的控制台日志：

 [Fine Uploader 5.16.0] Sending simple upload request for 0 fine-uploader.js:162 
 [Fine Uploader 5.16.0] xhr - server response received for 0 fine-uploader.js:162 
 [Fine Uploader 5.16.0] responseText = {} fine-uploader.js:162 
 [Fine Uploader 5.16.0] Received response status 200 with body: {} fine-uploader.js:162 
 [Fine Uploader 5.16.0] Simple upload request failed for 0