Envoy
Envoy Proxy Testing: Filter Chains, Health Checks, and Rate Limit Validation
Envoy is the data plane proxy behind Istio, AWS App Mesh, and Contour. It handles routing, load balancing, authentication, rate limiting, and observability for your services. When Envoy is misconfigured, the symptoms are subtle — requests fail under specific conditions, rate limits don't enforce correctly, or health checks pass