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Client: may I get /index.html please?

Server: sure, here's index.html, theme.css, and jquery.js.

Client: hey wait! I didn't ask for... oh, nvm, good call. Now I can display all this without asking you for anything else.

EDIT: See this: https://youtu.be/0yzJAKknE_k?t=30m52s for more details

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And add-track.js, flash-banner.gif?

This is just fancy cache-prewarming. The client still decides what resources to request, but those it wants to fetch are available locally at request time.

("just" as a qualifier for nefariousness, not usefulness)

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