Unleash / unleash-client-java / #1510

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feat: Obey HTTP Status codes from upstream. (#221)

* feat: Obey HTTP Status codes from upstream.

Previously we have treated any status code as equal. This PR changes
that to allow 429 and 50x status codes to incrementally increase the
interval between each time we call. And then gradually decrease once it
starts succeeding.

With 401,403 and 404 we immediately backoff to at minimum 300 seconds of interval as well as log at error level that we were not authorized or the URL did not exist.


Co-authored-by: Gastón Fournier <gaston@getunleash.io>

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