Ajax Call Cannot Find Php File

I am doing a ajax call , but its giving a error saying 404 file not found. $.ajax({ type : 'POST', url : 'app/lib/functions.php',

Solution 1:

maybe try it with:

$.ajax({ 
        type      : 'POST',
        url       : '../../app/lib/functions.php',
        data      : data,
        success   : function(data) {

        }
    });

or

$.ajax({ 
        type      : 'POST',
        url       : '../app/lib/functions.php',
        data      : data,
        success   : function(data) {

        }
    });

Solution 2:

I don't use AJAX much but I believe it should be pointing to a route, not directly to a file. That path would be relative and never actually resolve.