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scrollaway
on Sept 15, 2017
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S3 was down
Correct, AFAIK Always Online kicks in when the upstream cannot be reached (eg. connection timeout, unreachable dns etc).
elithrar
on Sept 15, 2017
[–]
You're both sort-of correct. AO kicks in on specific 5xx error codes: 502, 504, and then Cloudflare's 52x codes. It doesn't kick in on 500 or 503, or 4xx errors.
Ref:
https://support.cloudflare.com/hc/en-us/articles/202238800-W...
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