503 SERVICE UNAVAILABLE

The server is presently incapable to deal with the request because of an impermanent over-burden or booked support, which will probably be reduced after some deferral. 

The server MAY send a Retry-After header field1 to propose a suitable measure of time for the customer to hold up before retrying the request. 

Note: The presence of the 503 status code doesn’t infer that a server needs to utilize it when getting over-burden. A few servers may just reject the association.

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