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A comment on S3 was down. Parent comment

Re:S3 was down by scrollaway on Thursday September 14, 2017 @08:30PM (#15253639)
Correct, AFAIK Always Online kicks in when the upstream cannot be reached (eg. connection timeout, unreachable dns etc).
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Re:S3 was down by elithrar on Friday September 15, 2017 @01:50AM (#15254942)
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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