oss上传400报错

回调部分代码
格式有问题吗


put.setCallbackParam(new HashMap<String, String>() {
                        {
                            Log.e("回调", "上传回调: " + Config.callbackAddress);
                            put("callbackUrl","http://survey.three3.cn:8081/three_research/app/answer/oss/callback.htm");
                            //callbackBody可以自定义传入的信息
                            put("callbackHost", "oss-cn-shenzhen.aliyuncs.com");
                            put("callbackBodyType", "application/json");
                            put("callbackBody","{\"projectId\":${x:projectId},\"answerId\":${x:answerId},\"description\":${x:description},\"answer\":${x:answer},\"pictureCount\":${x:pictureCount},\"audioCount\":${x:audioCount},\"number\":${x:number},\"stage\":${x:stage},\"audio\":${x:audio}}");
                        }
                    });
                    put.setCallbackVars(new HashMap<String, String>(){
                        {
                            put("x:projectId",projectsDB.getPid());
                            put("x:answerId",subjectsDB.getHt_id());
                            put("x:answer",answer);
                            put("x:description",explain);
                            put("x:pictureCount",String.valueOf(imageSize));
                            put("x:audioCount",String.valueOf(recorderSize));
                            put("x:number",String.valueOf(number));
                            put("x:stage",stage);
                            put("x:audio",audioFileName);
                        }
                    });