anchor.diff:      indexData['categories'] = categoryList;
       indexData['tags'] = tagList;
   
  -    ctx.sendJson(buildResponse('handleDataInit', indexData, doLog: false));
  +    ctx.sendJson(_buildResponse('handleDataInit', indexData, doLog: false));
       ctx.end();
     }
   
     static handleOauth2(HttpContext ctx) {
       if (CartSystem.instance.credentials.length > 0) {
         PinLogger.instance.shout('[CartAction] handleOauth2: Already authorized!');
  -      ctx.sendJson(buildResponse('handleOauth2', { "error": "Already authorized!" }, valid: false));
  +      ctx.sendJson(_buildResponse('handleOauth2', { "error": "Already authorized!" }, valid: false));
       } else {
  -      ctx.sendJson(buildResponse('handleOauth2', {
  +      ctx.sendJson(_buildResponse('handleOauth2', {
           "url": CartSystem.instance.oauth2.getOAuthUrl()
         }));
       }
  
positive.code:           return new File(filePath)..writeAsBytes(fileUploaded.content, mode: FileMode.WRITE);
          })
          .then((_) {
            ctx.sendJson(buildResponse('handleUpload', { "fileName": fileUploaded.filename, "fileType": fileUploaded.contentType.toString() }));
          })
          .catchError((e, trace) {
            PinUtility.handleError(e, trace);
            ctx.sendJson(buildResponse('handleUpload', { "error": "Error encountered in handling file!" }, valid: false));
          });
        }
      })
      .catchError((e, trace) {
        PinUtility.handleError(e, trace);
        ctx.sendJson(buildResponse('handleUpload', { "error": "Error encountered in handling file!" }, valid: false));
      });
    }
  
  
negative.code:     bool isUserMaster = isMaster(ctx);
  
      if(!isUserMaster) {
        ctx.sendJson(_buildResponse('filterIsMaster', { "error": "User not logged in, pls login first!" }, valid: false));
        ctx.end();
      }
  
      return isUserMaster;
    }
  
    static Map _buildResponse(String actionName, HashMap message, {bool valid: true, bool doLog: true}) {
      HashMap result = {
          "valid": valid,
          "message": message
  