why there is meta tag in json response in laravel5

I confused very much. Please help me.

I have this java script code:

$(document).ready(function(e) {
    $('#requestButton').click(function(e) {
        $.ajax({
                type: "POST",
                dataType:"json",
                data:{job:'propertyCreation' },
                url: "/testajax", //Relative or absolute path to response.php file
                success: function(data)
                {
                    alert(data.responseText);

                },//success
                error:function(e){
                    alert(e.responseText);
                }
            }//ajax
        );//ajax
    });
});

Testajax function in my controller is responsible for answering to above ajax request.

public function testajax(Request $request)
{
    if ($request->isMethod('post')){
        $result=array('success'=>true,'response'=>$_REQUEST['job']);
        return json_encode($result);
    }

}

I expected that the response be

{"success":true,"response":"propertyCreation"}

but response is

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
{"success":true,"response":"propertyCreation"}

I confused why there is meta tag in json response and the result has error not success. sorry for my bad english and thank you in advance

via Chebli Mohamed