Google Calendar API v3中对OAuth服务帐户的参加者有限制吗？

Question

I have a Service Account created in a Super Admin account on my domain. I'm able to connect to the Google Calendar API v3 using the "Domain-wide Delegation of Authority" model provided by Google here ( https://developers.google.com/drive/delegation ). I can list my own events, list the events of others. No problem.

However, I am running into issues when inserting events with external attendees. To be clear, I can insert events just fine when including attendees within my own domain. (Aside from mysteriously blank exceptions that need to be caught!)

I can successfully insert a few events like this with external attendees, but soon, I start getting:

HttpError 403: "Calendar usage limits exceeded"

If I let it sit for a few hours, I can run it again and get a few events to insert, but then it starts with this error again.

Note: I'm not reaching the per-user quota and I'm nowhere near the daily courtesy limit. I do also have a sleep in the code between inserts. The body of the event is also confirmed to be well-formed.

I've isolated this issue down to the event attendees being external, seeing as how I do not get these errors when running the exact same code limited to attendees on the same domain. Can someone explain why this is occurring?

Answer 1

Perhaps you're reaching the limit of 5 requests/second? How many times a second are you attempting your inserts? I have not found (here: usage limits ) that the Calendar API has a per-second usage limit, but some other APIs do have such a restriction... either 5/sec or 10/sec api calls...