7 actually consists of at least two layers: a service layer and a content layer. The service layer is typically HTTP, which encapsulates the actual application data (the content layer). It is at this service layer of HTTP that the Istio’s Envoy proxy operates. In contrast, Network Policy operates at Layers 3 (Network) and 4 (Transport) in the OSI model.</p><p>Operating at the service layer gives the Envoy proxy a rich set of attributes to base policy decisions on, for protocols it understands, which at pr