Re:If blacking out your website, return status code 503 to a...
by rue on Tuesday January 17, 2012 @05:04AM
(#3474385)
I'd really rather everyone use the correct status codes (503 indeed being the correct one here) than try figure out what their SEO impact may or may not be. I'm quite sure Google understands HTTP.
It just so happens that 503 is the semantically correct response for this situation, while other 50x responses are not.