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Backend Protocol

Experimental Channel in v1.0.0+

This concept is part of the Experimental Channel in v1.0.0+.

Not all implementations of Gateway API support automatic protocol selection. In some cases protocols are disabled without an explicit opt-in.

When a Route's backend references a Kubernetes Service, application developers can specify the protocol using ServicePort appProtocol field.

For example the following store Kubernetes Service is indicating the port 8080 supports HTTP/2 Prior Knowledge.

apiVersion: v1
kind: Service
  name: store
    app: store
  - protocol: TCP
    port: 8080
    targetPort: 8080

Currently, Gateway API has conformance testing for:

  • - HTTP/2 Prior Knowledge
  • - WebSocket over HTTP