fix(grpc): ability to define timeout(s) for GRPC calls when using GatewayAPI

[davinkevin]

What steps did you take and what happened:

I deploy an app doing GRPC ServerSideStreaming, during a "long" period of time (few minutes). With Contour and the GatewayAPI, I can't configure a timeout above 15s and so I keep getting this error in my app:

16:38:16.523 [main] ERROR -- ❌ Error after PT15.013748S during ServerSide Streaming replies: CANCELLED
16:38:16.524 [main] ERROR -- ❌ Error:
io.grpc.StatusRuntimeException: CANCELLED

I deployed the app with the following GRPCRoute:

apiVersion: gateway.networking.k8s.io/v1
kind: GRPCRoute
metadata:
  name: grpc
spec:
  parentRefs:
    - name: gateway
      namespace: projectcontour
  hostnames:
  - server.k3d-for-grpc.local
  rules:
    - matches:
        - method:
            service: com.gitlab.davinkevin.experimentations.armeria.grpc.hello.HelloService
            method: Hello
        - method:
            service: com.gitlab.davinkevin.experimentations.armeria.grpc.hello.HelloService
            method: Hellos
        - method:
            service: com.gitlab.davinkevin.experimentations.armeria.grpc.hello.HelloService
            method: Dialog
        - method:
            service: grpc.reflection.v1alpha.ServerReflection
            method: ServerReflectionInfo
      backendRefs:
        - name: server
          port: 8081
      sessionPersistence:
        absoluteTimeout: 18s
        idleTimeout: 28s

And the Contour gateway is deployed with ContourDeployment:

kind: ContourDeployment
apiVersion: projectcontour.io/v1alpha1
metadata:
  namespace: projectcontour
  name: gateway
spec:
  runtimeSettings:
    envoy:
      timeouts:
        requestTimeout: 20s
        connectionIdleTimeout: 25s
        connectionShutdownGracePeriod: 30s
        connectTimeout: 35s
        delayedCloseTimeout: 40s
        maxConnectionDuration: 45s
        streamIdleTimeout: 50s

NOTE: I used different values to see which one has an impact on the behavior. It seems none were able to change something and I'm always blocked at 15s… even if I set all of them to 600s.

What did you expect to happen:

I expect one of those values to have an impact on the GRPC communication.

Anything else you would like to add:

I searched both the GatewayAPI spec and the Contour reference documentation and found nothing. Sorry if I missed the key, but it means it's pretty well hidden 😅.

Environment:

• Contour version: 1.32.0
• Kubernetes version: (use kubectl version): 1.30+
• Kubernetes installer & version: k3s/k3d
• Cloud provider or hardware configuration: docker-for-mac
• OS (e.g. from /etc/os-release): Linux distribution built-in docker-for-mac