1930500 - Restore `Clear-Site-Data: cache` functionality

Status: NEW

(Toolkit :: Data Sanitization, enhancement, P2)

Description

[Manuel Bucher [:manuel]]

With https://github.com/privacycg/storage-partitioning/issues/11 addressed (within Firefox) and concerns for Webcompat breakage, we want to restore the feature again.

Comment 1

[Manuel Bucher [:manuel]]

Attachment: WIP: Bug 1930500 - Restore "Clear-Site-Data: cache" functionality r=pbz

This reverts:

• https://hg.mozilla.org/mozilla-central/rev/38854fb7f44e
• https://hg.mozilla.org/mozilla-central/rev/3df455e2d5a8

Comment 2

[Sebastian Zartner [:sebo]]

Manuel, if I understand this bug correctly, once your patch lands, Clear-Site-Data: cache will be generally available again without being put behind a pref. Correct?

If so, the related browser compat data needs to be updated. Otherwise, it should be added to the Experimental Features page.

Sebastian

Comment 3

[Manuel Bucher [:manuel]]

Hi. Yes. However I haven't gotten around to adding tests. There didn't exist any when the feature landed previously. I'm looking into writing some web-platform tests, but haven't gotten around doing that just yet.

I'll slightly switch the strategy for the patch and introduce a pref (enabled by default), due to complications our current indexing within the http cache making it necessary to iterate through all files. This is a really expensive operation. I'm investigating the performance impact and possible strategies to mitigate the problem.