title: Google Drive API - Files and Permissions - 403 Rate Limit Exceeded
body: <p>I use a google service account to access a domain's users and their files. Our current API usage is way below the daily allotted quota and doesn't even cross 50% most of the time and I have implemented exponential back off as well. </p>
  
  <p>Even though, at times, I receive the following exception with this service account.</p>
  
  <p>{
      "domain": "usageLimits",
      "reason": "rateLimitExceeded",
      "message": "Rate Limit Exceeded"
  }</p>
  
  <p>This exception is more pronounced for a period of few hours daily whereas the developers console around the same time indicates that we didn't even cross 10% of the daily quota at that time. </p>
  
  <p>This exception is seen for drive API methods such as files.list, files.get, permissions.list, and about.get.</p>
  
  <p>Google Drive SDK <a href="https://developers.google.com/drive/v2/reference/" rel="nofollow">documentation</a> doesn't seem to provide information about API Rate Limits and Quotas. Google folks! Are there any other internal limits other than the daily limit and per user limit?</p>
  
  <p>P.S: I know that there are certain limits on number of uploads, number of downloads, and number of permission insert operations. But I receive this exception for the aforementioned methods and I am not aware of any limits on these methods.     </p>