How to transfer data from client to server?

Question

JavaScript

I need to transfer the data from the form (they have already been received) to the server. I know what to send a post request, but
I don't understand the principle itself. I created a request and how do I get it and withdraw it.
Can you please explain how it works and how to do it.

I write in JavaScript.

Answer 1

It is enough to google: https://learn.javascript.ru/xmlhttprequest