Interruption of an asynchronous request

Question

What happens when the user, for example, reloads the page with an asynchronous request in progress? Does the server continue to run the script? And how can I interrupt an ongoing request via JS?

Answer 1

What happens when the user, for example, reloads the page with an asynchronous request in progress?

Depends on the timing. If the request has already been sent to the server, it is processed normally (but, of course, the response will never be delivered to the client). If the request is not out yet, it never reaches the server and is not processed. In general you will fall in the first case, do not know under what circumstances you could fire a request and reload the page even before it is sent.

And how can I interrupt an ongoing request via JS?

Whereas you are wearing XMLHttpRequest, there is a method abort:

// Enviar:
var requisicao = new XMLHttpRequest();
requisicao.open("get", "arquivo.html", true);
requisicao.send();
// CANCELAR:
requisicao.abort();