Cache-aware server push

[ocean90]

This is a tracking issue to research if a cache-aware server push is possible and/or still necessary.

Following resources I have read so far:

• https://joehonton.medium.com/speculative-push-with-http-2-5d5810e256c9
• https://css-tricks.com/cache-aware-server-push/
• https://h2o.examp1e.net/configure/http2_directives.html#http2-casper
• http://blog.kazuhooku.com/2015/12/optimizing-performance-of-multi-tiered.html
• https://evertpot.com/http-2-push-is-dead/

Some testing:

First view	Repeat view