When usage limits are exceeded, SharePoint Online throttles any further requests from that client for a short period.įor requests that a user performs directly in the browser, SharePoint Online redirects you to the throttling information page, and the requests fail.įor requests that an application makes, including Microsoft Graph, CSOM or REST calls, SharePoint Online returns HTTP status code 429 ("Too many requests") or 503 ("Server Too Busy") and the requests will fail. What happens when you get throttled in SharePoint Online? Throttling limits the number of API calls or operations within a time window to prevent overuse of resources. SharePoint Online uses throttling to maintain optimal performance and reliability of the SharePoint Online service. What's going on and what can you do to make it stop? What is throttling?
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