better distinguish between handled and not handler errors

website/server/middlewares/api-v3/errorHandler.js

@@ -69,7 +69,8 @@ module.exports = function errorHandler (err, req, res, next) { // eslint-disable
     originalUrl: req.originalUrl,
     headers: omit(req.headers, ['x-api-key', 'cookie']), // don't send sensitive information that only adds noise
     body: req.body,
-    statusCode: responseErr.httpCode,
+    httpCode: responseErr.httpCode,
+    isHandledError: responseErr.httpCode < 500,
   });
 
   let jsonRes = {