高分请问关于使用webclient上传文件的有关问题

高分请教关于使用webclient上传文件的问题！
SL项目使用webclient上传文件，在本机调试是正常的，发布到服务器后，在服务器上用http://localhost:2987打开也能正常上传，但用在服务器上打开http://服务器ip:2987 就是上传不了文件，在其他机器上用ip:2987也无法上传。实在整不明白了，请问大家这是怎么回事？

C# code

        public void UploadFile(FileInfo file, string savePath)        {            WebClient client = new WebClient();            client.OpenWriteCompleted += new OpenWriteCompletedEventHandler(client_OpenWriteCompleted);            client.WriteStreamClosed += new WriteStreamClosedEventHandler(client_WriteStreamClosed);            FileStream stream = file.OpenRead();            if (stream.Length < BufferSize)            {                BufferSize = stream.Length;            }            client.OpenWriteAsync(new Uri("http://192.168.1.254:2987/WebClientUpload.ashx?filename=" + file.Name + "&savepath=" + savePath , UriKind.Absolute), "POST", stream);            //这里我尝试用http://localhost:2987或http://192.168.1.254:2987都不行        }

[解决办法]
改成这样试试
client.OpenWriteAsync(new Uri("http://"+Request.Url.Authority+"/"+"WebClientUpload.ashx?filename=" + file.Name + "&savepath=" + savePath , UriKind.Absolute), "POST", stream);
//把http://192.168.1.254:2987 换成 "http://"+Request.Url.Authority
[解决办法]
http://msdn.microsoft.com/zh-cn/library/cc838250(v=vs.95).aspx

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