CODE EXAMPLE FOR PHP

419 unknown status

//It's an error of csrf token, there is multiples ways to fix it, too much to 
//write a grepper answer on.

//419 : error of csrf token

//Common way to fix it, try this
$.ajaxSetup({
    headers: {
        'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
    }
});