You'd have to handle this in service workers. You want this: https://datatracker.ietf.org/doc/draft-ietf-httpbis-cache-di...

Why would you need this? The use case of Server Push is to download resources earlier than a browser can request them, but will eventually require anyway.

What are you hoping to refuse?

Thanks for the reply, and good point. I guess I feel uneasy about letting the server "push" at will, for instance when dealing with mobile data plans. But come to think about it, I don't have much control on what I'll get once I visit a website.