生产环境中的HttpPostedFileBase为空，但测试环境中不为空

我有两个环境，直到今天我都认为是完全一样的。(沙盒,生产)

我有一个移动设备，将文件发送到服务器。这在沙箱环境中工作得很好，但是当我在生产环境中运行相同的东西时，该文件为空。我在网上查过了。config和<httpRuntime requestValidationMode="2.0" maxRequestLength="264768888" />在这两个环境中都设置为以上。我遗漏了什么?有什么不同呢?这是IIS中的一些设置吗?下列代码:

我要测试的文件是64k。

服务器代码

[HttpPost, Url("v3/organizations/{organizationId?}/SyncVideo/")]
public virtual void SyncVideo(HttpPostedFileBase file, Guid? organizationId) {
    if (file == null)
        throw new HttpBadRequestException("file is missing");
    if (organizationId.IsNull()) throw new HttpNotFoundExecption();
    if (organizationId != RESTContext.OrganizationId) throw new HttpNotAuthorizedException();
    var basePath = RESTContext.Config.VideoPath;
    //using (new Impersonator(RESTContext.Config.VideoPathUsername, RESTContext.Config.VideoPathDomain,
    //    RESTContext.Config.VideoPathPassword)) {
    //    if (!Directory.Exists(basePath))
    //        Directory.CreateDirectory(basePath);
    //    file.SaveAs(basePath + @"'" + file.FileName);
    //}
}

客户机代码

public void UploadFile(string url, string path) {
    Stream stream = null;
    HttpClient client = null;
    MultipartFormDataContent content = null;
    StreamContent streamContent = null;
    try {
        stream = Platform.FileSystem.ReadStreamFromFile(path);
        Platform.Console.WriteLine(stream.Length.ToString());
        client = new HttpClient();
        content = new MultipartFormDataContent();
        foreach (var header in headers)
            client.DefaultRequestHeaders.Add(header.Key, header.Value);
        streamContent = new StreamContent(stream);
        content.Add(streamContent, "file", Path.GetFileName(path));
        var message = client.PostAsync(url, content).Result;
        if (message.StatusCode != HttpStatusCode.OK) {
            Platform.Console.WriteLine(message.ToString());
            throw new Exception(message.ToString());
        }
    } finally {
        content.NullSafeDispose();
        client.NullSafeDispose();
        stream.NullSafeDispose();
        streamContent.NullSafeDispose();
    }
}