How to disable CORS on openserver?

Question

CORS

I want to make a request to another site via js from localhost. Here is my js:

js

// Отправка данных на сервер
function send(event, asite){
console.log("Отправка запроса");
event.preventDefault ? event.preventDefault() : event.returnValue = false;
var req = new XMLHttpRequest();
req.open('POST', asite, true);
req.onload = function() {
  if (req.status >= 200 && req.status < 400) {
  json = JSON.parse(this.response);
    	console.log(json);
    // Если не удалось связаться
    } else {alert("Ошибка сервера. Номер: "+req.status);}}; 

// Если не удалось отправить запрос. Стоит блок на хостинге
req.onerror = function() {alert("Ошибка отправки запроса");};
req.send(new FormData(event.target));
}

And when sending the request, the following error message is returned:

...has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

I read on the net that you need to create a .htaccess file and write the line there Access-Control-Allow-Origin:*. I do this, but in the end my page does not open at all (error 500).

What to do to make everything work?