How to instantly respond to changes on a third-party site?

Question

RSS

The task is as follows. There is a news site that provides open access to the description of their posts in RSS format.
I need to write a server on node.js that would instantly react to newly added news on the site and read it through some kind of RSS reader. Found this here . But they use the request module, which sends requests. That is, I will have to manually send requests after some time, and I will receive information about the news with a delay.
In which direction to dig?

Answer 1

That is, I will have to manually send requests after some time, and I will receive information about the news with a delay.

No other way, alas.
Unless you consider the option of cooperation with the site)