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HTTP/2 servers can preload (if they choose).

Doesn't that require same origin, and thus AMP-style central caching?

Google is pushing "HTTP origin signed responses" which will mean Google or any other implementing server can cache responses from other (willing) origins and push or offer them. Then, the address bar can show the actual origin, instead of www.google.com/amp as the origin.

Preload is different from push.

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