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
