Getting 302 found in ajax jquery request in laravel

I'm using ajax request in laravel and passing csrf token also but some times my application gets stuck and getting this error :

Code :

  var formData = $(this).serialize();
    $.ajaxSetup({
        header:$('meta[name="_token"]').attr('content')
    });
    $.ajax({
        url:$(this).attr('action'),
        type:'POST',
        data:formData,
        headers: {
            Accept: "application/json"
        },
        success:function(response) {

This form is in modal popup :

 <form id="user-login" class="login" action="" method="post">
 

Any solution, Thanks

via Chebli Mohamed