You can route to a Kubernetes service by simply referencing that service in the backendRefs section of your HTTPRoute resource as shown in the following example.

apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: static-upstream
  namespace: default
spec:
  parentRefs:
  - name: http
    namespace: gloo-system
  hostnames:
    - static.example
  rules:
    - backendRefs:
      - name: httpbin
        port: 8000
      filters:
      - type: ExtensionRef
        extensionRef:
          group: gateway.solo.io
          kind: RouteOption
          name: rewrite