The Google Drive API has a quota called Queries per 100 seconds *per user* - but what exactly is a user?
Is it per OAuth 2.0 client ID, or is it per source IP?
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2 Answers
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As what stated in the note:
Note: Per-user quotas are always enforced by the Drive API. If the quotaUser and userIp parameters are omitted, the quota user is determined by the access token in the request.
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In general when we refer to the user, it is the "end user". So in the drive API it would be the user who has given access to your app. But the same user could have given drive access to 500 other apps. If all of those apps try to access the user's drive a the same time then this limit could be reached easily and each of the app developer may wonder what they did wrong as they may be just doing 1 qps. So this relates to the user's drive account.