[wp-trac] [WordPress Trac] #63636: Enable instant page navigations from browser history via bfcache when sending "nocache" headers

[WordPress Trac]

#63636: Enable instant page navigations from browser history via bfcache when
sending "nocache" headers
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 Reporter:  westonruter                          |       Owner:
                                                 |  westonruter
     Type:  enhancement                          |      Status:  accepted
 Priority:  normal                               |   Milestone:  Future
                                                 |  Release
Component:  Administration                       |     Version:  6.3
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch dev-feedback needs-unit-   |     Focuses:
  tests                                          |  performance, privacy
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Comment (by kkmuffme):

 Sorry for not getting back earlier, I had a really long and thought out
 comment, which got lost due to an auto-update...

 Anyway, Cloudflare improved/fixed/changed various things in the recent
 months, making it much saner - in fact they now essentially strictly
 adhere to the standard: https://datatracker.ietf.org/doc/html/rfc7234

 Quoting MDN:
 >Note that no-cache means "it can be stored but don't reuse before
 validating" — so it's not for preventing a response from being stored.

 >Clear-Site-Data: "cache"

 This won't be possible, since it will clear all subdomains (and the domain
 itself), not just the current (sub)domain - not only will this massively
 worsen usability (since the whole cache is cleared incl. JS/CSS and media
 (!) it will result in significantly more traffic for large blog operators.


 While for some pages like frontend cart, checkout,... its fine with no-
 cache, private, I think in wp-admin this is not the case - be it editing
 products (qty!) or pages.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63636#comment:20>
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