Getting 429 when calling API from Java

Question

Hi,

Not sure if this is the correct place to post this, if not, please let me know.

I have a strange issue with the API endpoint

https://usermanagement.adobe.io/v2/usermanagement/.

I wrote a small Java program that gets a token and calls the above endpoint to retrieve the users from our organization, running the program once is fine, but running it a second or third time I receive a 429 with a retry-after of over 30 mins. Calling the same endpoint from Postman directly after is fine. I can't imagine hitting API limits after only doing 2 calls (retrieve an authentication token and calling the usermanagement endpoint), so is there something else going on here?

Happy to get some help!

Sietse

Sietse290291245n2j · Accepted Answer

After some debugging it turned out that you need to send a "User-Agent" header when requesting a second access token quickly after the first request.

So this fails:

Request access token
Call usermanagement API with access token -> 200

Request new access token

Call usermanagement API with new access token -> 429

But if you do it like this it works:

Request access token

Call usermanagement API with access token -> 200

Request new access token

Call usermanagement API with new access token AND User-Agent header set -> 200

Interesting! But at least it works now.

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