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Feature #11508

Updated by Peter Amstutz over 7 years ago

In order to facilitate upgrade without downtime, designate 503 (Service Unavailable) to designated a special HTTP 500 code that indicates "planned downtime".    When an Arvados client gets this code, it should retry forever (?), respecting the "Retry-After" header if available. 

 https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html forever.

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