Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
9,092 questions
Occasional 412 errors when listing calendars using Microsoft Graph API
Monty123
1
Reputation point
I'm making GET requests to the following endpoint:
https://graph.microsoft.com/v1.0/me/calendars
Roughly 3.5% of these calls fail with a 412 error code. The same call will succeed a few minutes later. There does not seem to be any pattern to the failures.
Is this a recognized problem? Is there a solution other than ignoring the 412s and trying again later?
{count} votes
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Deva-MSFT 2,256 Reputation points Microsoft Employee2021-02-15T15:59:53.79+00:00 HTTP 412 means that precondition failed; in other words, a precondition provided in the request (such as an if-match header) does not match the resource's current state.
- Hows your API call look like?
- Do you use any precondition with it?
- Outside of your code, can you repro the issue with POSTMAN/Microsoft Graph Explorer as well?
- Share the detailed error response (with requestid, timestamp) that you received.
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Monty123 1 Reputation point
2021-02-16T16:51:21.983+00:00 Full request:
GET https://graph.microsoft.com/v1.0/me/calendars
No payload or query string parameters, and no precondition.
Full response:
412 {'error': {'code': 'ErrorIrresolvableConflict', 'message': 'The send or update operation could not be performed because the change key passed in the request does not match the current change key for the item.'}}
Don't have time to reproduce due to its transient nature.
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