Re: [w3ctag/design-reviews] Periodic Background Sync (#367)

Hi, thank you for your response. 
@kenchris and I were looking at this during our f2f.
Regarding the unregister on 4xx response, I think that it is important to have that, an error core (4xx or 5xx) should trigger an unregister to avoid zombie WebAppSec doing slow DDoS (if triggered by enough clients), so unregistering on errors mitigate that issue.

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