OSS回调成功了却显示203错误

1.OSS 设置回调地址，回调成功了，但却显示203错误，如下
CallbackFailed Callback to application server failed, please check your callbackUrl. 5663F7B9B295343C79332060 saas01.oss-cn-hangzhou.aliyuncs.com


用的例子是表单上传PHP回调上传那个，info.status返回的是203，但实际已调用了回调函数，应用服务器已获取到文件信息

FileUploaded: function(up, file, info) {
            console.log('uploaded')
            console.log(info.status)
            set_upload_param(up);
            if (info.status == 200)
            {
                document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = 'success';
            }
            else
            {
                document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = info.response;
            }
},




2.OSS既然不支持表单大文件的断点上传和断点下载，是不是意味着要进行表单断点上传只能走应用服务器，再由应用服务器把数据发给OSS？除了这个有什比较好的解决方法吗？
3.我通过向应用服务器申请 在header头部进行的签名Authorization，是不是要根据获取到的这个Authorization向OSS发送请求。请求如下，这样写会返回403错误，请问具体要怎么写？
date=new Date().toUTCString();

$.ajax({
                async:true,
                cache:false,
                type: 'post',
                dataType : "jsonp",
                jsonp:"jsoncallback",
                url:"http://example.oss-cn-hangzhou.aliyuncs.com/test“,
                headers: {
                  "Authorization":"OSS dfEREKOkodf345dfd:vfcQEKlhMqWLS7yutRTJJui4sSiU=",
                    "Content-MD5":"",
                    "Content-Type": "text/html",
                    "Date": date,
                    "X-OSS-Meta-Author": " foo@bar.com",
                    "X-OSS-Magic": "abracadabra",
                    "host":"example.oss-cn-hangzhou.aliyuncs.com",

                },success:function(data){

                }
            });