Retry-After header

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About

The HTTP Retry-After response header indicates how long the user agent should wait before making a follow-up request¹.

In a 503 Service Unavailable response, this indicates how long the service is expected to be unavailable
In a 429 Too Many Requests response, this indicates how long to wait before making a new request
In a a redirect response , such as 301 Moved Permanently , this indicates the minimum time that the user agent is asked to wait before the redirected request