I've been running into a frustrating issue where my OPTIONS requests to an API Gateway endpoint occasionally fail with a "403 Forbidden" response. This error comes with the specific type "ForbiddenException." I've combed through the AWS documentation that outlines potential reasons for this error, but none seem to apply to my situation. Has anyone else experienced random, infrequent 403 errors on OPTIONS requests?
5 Answers
I've noticed that the 403 errors seem to happen more frequently if the browser tab has been open for several consecutive days. It’s not completely consistent, but I’ve seen it pop up a few times in my logs when the tab has been idle for too long.
We’ve faced similar problems before. Could you share which region you're in? Someone I know looked into a related issue when they were working in us-west-1.
Sounds like an ALB (Application Load Balancer) issue. It might be worth retrying the request on the client side to see if it helps.
Since OPTIONS requests typically don't require authentication, check if your API Gateway's default settings are causing the 403 instead of a 404. You might want to verify that the path and method you’re using actually exist.

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