How to add csrf_token when using dataprocessor to insert/upd

Hi, I’m using dhtmlx dataprocessor and laravel.
However I cannot succeed in getting visit to the server side connector, maybe because the csrf token. The browser level debug shows: Failed to load resource: the server responded with a status of 500 (Internal Server Error)

The laravel log says:

  1. in VerifyCsrfToken.php line 53
  2. at VerifyCsrfToken->handle(object(Request), object(Closure))