Traefik 3.6's multi-layer routing held up against 500 concurrent header-spoofing attempts

I tested Traefik 3.6's new parentRefs routing: 0 of 500 concurrent requests bypassed a parent router by spoofing its child's header condition, and three-level nesting cost no measurable throughput against an equivalent flat router (5,475 vs 5,503 req/s).

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