message: lower case params in base backend service
diff: @@ -74,7 +74,7 @@ export abstract class BaseBackendService<M extends BaseModel> {
  for (let key in params) {
  if (params.hasOwnProperty(key)) {
  - urlParams.set(key, params[key]);
  + urlParams.set(key.toLowerCase(), params[key]);
  }
  }
  