GEP: Support Matching Scheme in HTTPRouteMatch

[dprotaso]

The scheme match via pseudo headers suggested in #2455 only applies to HTTP/2. It would be useful to still match on the scheme for any HTTP version.

One use case is the match could be used to prevent redirect loops. From #1185 (comment)

apiVersion: gateway.networking.k8s.io/v1alpha2
kind: HTTPRoute
metadata:
  name: http-filter-redirect
spec:
  hostnames:
    - redirect.example
  rules:
    - matches:
      - scheme: http 
      filters:
      - type: RequestRedirect
        requestRedirect:
          scheme: https
          statusCode: 301

In the above example we have the HTTPRoute perform a redirect if the scheme of the request is http

[dprotaso]

Few questions that come to my mind

1. Can scheme be spoofed?
2. Can gateways actually infer the scheme reliably?

For 2) a concrete example would be how does a gateway determine the scheme used was ws (websocket) over http - is it possible? Upgrade headers are for protocol not scheme. 🤷

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close not-planned

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