[Webkit-unassigned] [Bug 71509] WebKit memory cache doesn't respect Vary header

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=71509

--- Comment #22 from Antti Koivisto <koivisto at iki.fi> ---
(In reply to comment #20)
> How much additional complex it would it be to implement full vary support?

It would require moving the logic from network cache code in WK2 to WebCore. Memory cache entries would need to contain the varying header values. 

The biggest problem is "Vary:Cookie" (which also the most common use) as cookie header is not visible in ResourceRequest and gets added magically behind the scenes by CFNetwork. Getting the value from web process involves synchronous IPC to network process and synchronous cookie storage read. Making this not a performance risk is tricky.

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