how to call to url using ajax to call php file when base url is using localhost:8000

I have searched just about everywhere on trying to do a call using ajax to a file that is up one level in the app folder. I am using a built from scratch mvc framework. I am using vscode as my editor and running php -S localhost in the terminal. This is the url being displayed

localhost:8080/somepage

here is the folder/file structure:

path for some.ajax.php: mvc\app\ajax\some.ajax.php

path for index.php: mvc\public\index.php

path for some.js: mvc\public\assets\js\some.js

here is the code

$(document).ready(function () {
  var url = "../app/ajax/some.ajax.php";
  gridSettings = {
    url: url,
    submitUrl: url,
    selectUrl: url,
    tableName: "sometable",
    editable: false,
    allowAdd: true,
    allowDelete: true,
    allowEdit: true,
    refreshAfterUpdate: true,
  };

  $("#categories").editGrid(gridSettings);
});

so when I use ../app/ajax/some.ajax.php, I am getting an 404 error stating it cannot be found. POST http://localhost:8080/app/ajax/profile.ajax.php 404 (Not Found)

Then when using the full path to it http://localhost/mvc/app/ajax/some.ajax.php, I get the following error and the code will not process

errors from web dev console

Access to XMLHttpRequest at 'http://localhost/mvc/app/ajax/some.ajax.php' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. jquery-3.6.1.min.js:2

POST http://localhost/mvc/app/ajax/some.ajax.php net::ERR_FAILED 200

so any help would be appreciated.

source https://stackoverflow.com/questions/73839684/how-to-call-to-url-using-ajax-to-call-php-file-when-base-url-is-using-localhost