[Webkit-unassigned] [Bug 46529] Output X-Purpose header for prefetch requests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=46529


Alexey Proskuryakov <ap at webkit.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|HTML DOM                    |Page Loading
                 CC|                            |beidson at apple.com,
                   |                            |koivisto at iki.fi




--- Comment #12 from Alexey Proskuryakov <ap at webkit.org>  2010-09-24 16:41:59 PST ---
The use cases seem questionable to me.
- If servers return something different for prefetch, that will confuse intermediate proxies. Servers will need to at least send "Vary: X-Purpose" with the response, and I'm not confident whether it would suffice in practice. I'm particularly suspicious of changing between 404 and 200 based on the Vary header.
- If a site doesn't count prefetched requests, it won't see any requests (because the browser will already have the data, and won't make the "real" request).
- Why is it good to let servers return 404 for prefetch? We want prefetch to succeed. If there is a need to opt out, let's find a way that doesn't involve wasting time on sending the request.

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