Hi, Stefano!

I am not able to answer your question directly, because of my limited haproxy knowledge. Generally speaking, I prefer to return code 429 when a client makes too many requests, instead of queuing them.

This page helped me a lot to understand haproxy capabilities
https://icicimov.github.io/blog/devops/HAProxy-DDOS-protection-and-API-rate-limiting/

Ciao

.marcoc

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