Insert Calendar occasionally returns "Calendar usage limits exceeded"

Question

Adding Calendar to Google using Google Calendar APIs is throwing exception randomly(not every time or not on specific conditions) while adding calendars :

{"Google.Apis.Requests.RequestError 
       Calendar usage limits exceeded. [403]
       Errors [Message[Calendar usage limits exceeded.] 
       Location[ - ] Reason [quotaExceeded] Domain[usageLimits]]"}

Limit is not exceeded still there is exception.

Answer 1

You are hitting one of the quota limits. I don't know what you are doing exactly but I would start with the last option below exponential backoff. I suspect that your application is running to fast you need to slow it down that's why you are not getting this all the time you are hitting flood protection. Example: X number of requests per second.

Background info: The following is directly from Googles Documentation.

403: Calendar usage limits exceeded The user reached one of the Google Calendar limits in place to protect Google users and infrastructure from abusive behavior.

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "message": "Calendar usage limits exceeded.",
    "reason": "quotaExceeded"
   }
  ],
  "code": 403,
  "message": "Calendar usage limits exceeded."
 }
}

Suggested actions:

• Read more on the Calendar usage limits in the Google Apps Administrator help.
• If one user is making a lot of requests on behalf of many users of a Google Apps domain, consider using a Service Account with authority delegation (setting the quotaUser parameter).
• Use exponential backoff.