Alex Wiese 96cdf035d8 fix(service-worker): treat 503 as offline (#35595)
Prior to this commit the service worker only treated 504 errors as "effectively offline".
This commit changes the behaviour to treat both 503 (Service Unavailable) and 504 as "offline".

Fixes #35571

PR Close #35595
2020-02-25 13:10:10 -08:00
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