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Browsers could cache dictionaries per MIME type per domain which are provided by the server. Would be super cool, if a bit more complicated.

Yep, that's in the vicinity of the solutions we're thinking about. There are a few proposals out there, and prior art like SDCH [1].

The hard part is that compression is already an attack vector for the web (e.g., CRIME [2], BREACH [3], et al.). We want to make sure that we're not eroding or unduly complicating that situation [4].

[1] https://tools.ietf.org/html/draft-lee-sdch-spec-00 [2] https://en.wikipedia.org/wiki/CRIME [3] https://en.wikipedia.org/wiki/BREACH [4] https://tools.ietf.org/html/draft-kucherawy-httpbis-dict-sec...

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