[manigandham]

Envoy was built for that purpose and has more functionality around it, as well as better support for service discovery (developing the now open standard APIs), more protocol introspection and observability, full-duplex connections (no upstream/downstream split in what's possible), and easy interchange between protocols.

Envoy is also used by Istio and has a lot of infrastructure support for deploying in Kubernetes and such which HAProxy doesn't currently have.