pub const RETRY_AFTER: HeaderName;Expand description
The Retry-After response HTTP header indicates how long the user agent should wait before making a follow-up request. There are two main cases this header is used:
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When sent with a 503 (Service Unavailable) response, it indicates how long the service is expected to be unavailable.
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When sent with a redirect response, such as 301 (Moved Permanently), it indicates the minimum time that the user agent is asked to wait before issuing the redirected request.