Prevent throttling in your application by using RateLimit headers in SharePoint Online

SharePoint Online uses throttling to maintain optimal performance and reliability of the SharePoint Online service. Throttling feature controls the number of API calls or operations within a time window to prevent overuse of resources. When your application gets throttled, SharePoint Online returns a HTTP status code 429 (“Too many requests”) or 503 (“Server Too Busy”) and the requests will fail.

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