I want to use headersForRequest of RESTAdapter. It is called in _requestFor method wich can be called in some methods (for example updateRecord),
but there is a condition
if (isEnabled('ds-improved-ajax') && !this._hasCustomizedAjax())
Feature ds-improved-ajax was disabled.
Can I enable this feature someway? Is it a bug that headersForRequest can’t be accesible?