Summary: Clear-Site-Data is a HTTP header sent by web servers to clear
various browser states for an origin. The "cache" directive indicates to
the browser that it should clear the networking cache and various other
caches it has for the origin.
We originally shipped “cache” support in Gecko starting with version 63.
And unshipped in 93
<https://groups.google.com/a/mozilla.org/g/dev-platform/c/I939w1yrTp4/m/2ZaH0JwLBAAJ>due
to cross-site tracking concerns. The cross-site leak concerns are
documented in
https://github.com/privacycg/storage-partitioning/issues/11
<https://github.com/privacycg/storage-partitioning/issues/11>.
The new implementation shipping now has the cross-site leak concerns
addressed by only cleaning the partition the header was received in.
Tests for them are included in web-platform tests:
https://wpt.fyi/results/clear-site-data/clear-cache-partitioning.https.html
<https://wpt.fyi/results/clear-site-data/clear-cache-partitioning.https.html>
Brief history in Gecko:
Shipped in Fx64: https://bugzil.la/1470111 <https://bugzil.la/1470111>
Unshipped in Fx94: https://bugzil.la/1671182 <https://bugzil.la/1671182>,
Bug: https://bugzil.la/1930500 <https://bugzil.la/1930500>
Specification:https://www.w3.org/TR/clear-site-data/#clear-cache
<https://www.w3.org/TR/clear-site-data/#clear-cache>
Preference: privacy.clearSiteDataHeader.cache.enabled
Web-platform-tests:
*
https://wpt.fyi/results/clear-site-data/clear-cache-partitioning.https.html
<https://wpt.fyi/results/clear-site-data/clear-cache-partitioning.https.html>
*
https://wpt.fyi/results/clear-site-data/clear-cache.https.html
<https://wpt.fyi/results/clear-site-data/clear-cache.https.html>
Other Browsers:
*
Blink: Supported since version 61
*
WebKit: Supported since version 17
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