What is the significance of the 'Retry-After' header in a 503 response?

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Grade: Education Subject: Support
What is the significance of the 'Retry-After' header in a 503 response?
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The 'Retry-After' header, included in the 503 response, tells the client (browser) how long to wait before attempting to request the resource again. This helps prevent overwhelming the server after a temporary outage and allows it to recover properly.