How to recognize 500 or 503 response as rate-limit

Hi, have a look at https://aws.amazon.com/premiumsupport/knowledge-center/http-5xx-errors-s3/ to troubleshoot HTTP 500 or 503 error from Amazon S3.

Also have a look at:

https://aws.amazon.com/premiumsupport/knowledge-center/s3-503-within-request-rate-prefix/

If there is a fast spike in the request rate for objects in a prefix, Amazon S3 might return 503 Slow Down errors while it scales in the background to handle the increased request rate. To avoid these errors, you can configure your application to gradually increase the request rate and retry failed requests using an exponential backoff algorithm [1].

[1] https://docs.aws.amazon.com/general/latest/gr/api-retries.html