Sharepoint Online: Sharepoint Rest API

Question

When we are trying to get data from SharePoint Online via SharePoint Rest APIs, it is getting throttled after fetching 300-400 objects (Files). For fetching a file and its associated metadata, we are making ~8 API Calls. After a few minutes we are receiving HTTP 429 (Throttling). Even after the retrying the calls after the given amount of time in the Retry-After Header, it is getting stuck. It doesn't give any error, nor it gives proper response.

Answer 1

Hi @Yichen Name
HTTP 429 indicates the calling application sent too many requests in a time window and exceeded a predetermined limit. In this case, a Retry-After header is included in the response indicating how long the calling application should wait before retrying or making a new request. Throttled requests count towards usage limits, so failure to honor Retry-After may result in more throttling. You can use RateLimit HTTP headers to avoid Throttling

HTTP/1.1 429 Too Many Requests  
Retry-After: 31  
RateLimit-Limit: 1200  
RateLimit-Remaining: 0  
RateLimit-Reset: 31  

For more details you can refer to the document
https://learn.microsoft.com/en-us/sharepoint/dev/general-development/how-to-avoid-getting-throttled-or-blocked-in-sharepoint-online#how-to-handle-throttling

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