How to encode “post_type” in URL?

I stumbled upon this article –

Essetially it explains that you can do stuff like this:

With a bit of javascript you can make a non-AJAX filtering thing on your site pretty easily.

My question is how can you add to an URL a “post_type” parameter for custom posts?

I tried (example post type is “news”):

But it didn’t work.

When writing a wp_query, you would write something like this:

$query->set ( [‘post_type’ => ‘news’);

But I have to no idea how to put this in the URL.