Add support for `nopush` attribute
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ebidel commented
https://w3c.github.io/preload/#server-push-http-2
Link: </app/style.css>; rel=preload; as=style; nopush
Link: </app/script.js>; rel=preload; as=script
The above example indicates to an HTTP/2 push capable server that /app/style.css should not be pushed (e.g. the origin may have additional information indicating that it may already be in cache), while /app/script.js should be considered as a candidate for server push.