iOS上传回调失败

      OSSPutObjectRequest *request = [OSSPutObjectRequest new ];
      request. bucketName = @"yayi-avatar";
      request. objectKey = [ NSString stringWithFormat: @"doctor2/%@.jpg",[ self MD5:append]];


      request. callbackParam = @{
                           @"callbackUrl":url,
                          @"callbackBody" :@"ossurl=http://${bucket}.oss-cn-hangzhou.aliyuncs.com/${object}&userid=${x:userid}"
                           };
      request. callbackVar = @{ @"x:userid":userid };




      request. uploadingData = data;
      request. contentType = @"image/jpeg";
      request. uploadProgress = ^( int64_t bytesSent, int64_t totalByteSent, int64_t totalBytesExpectedToSend) {
             NSLog( @"%lld, %lld, %lld", bytesSent, totalByteSent, totalBytesExpectedToSend);
        };
       OSSTask * task = [ client putObject:request];
      [task continueWithBlock:^ id( OSSTask *task) {
             if (!task. error) {
                 OSSPutObjectResult *result = task. result;
                 NSLog (@"upload object success!" );
                
              
            } else {
                fail( true);
                 NSLog ( @"upload object failed, error: %@" , task. error );
            }
             return nil;
        }];

上传回调代码是什么样的？