HTTP Route Core Support

[mpstefan]

For our release of NGINX Gateway v1.0, we need at least core support for HTTP Route as defined in the Kubernetes Gateway API v1beta1. This epic will track all the enhancements that need to be made to the HTTPRoute to reach support for "core".

Current Gateway compatibility doc

List of extended or implementation-specific features that will NOT be implemented at this time:

• Regular expression matching
• requestRedirect path
• responseHeaderModifier, requestMirror, urlRewrite, and extensionRef filters.
• backendRef filters

Acceptance:

• Documentation is updated to reflect what extended features are still unsupported.

### Core Support Stories
- [ ] #479
- [ ] #478
- [ ] #476
- [ ] #480
- [ ] #606
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/611
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/306
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/687
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/755
- [ ] https://github.com/nginxinc/nginx-kubernetes-gateway/issues/776

For Discussion:

• The spec appears to require regular expressions as an enum, but list the feature as "implementation-specific" - is this correct?
  • Yes
• What additional condition support do we need for status?
  • In theory, just ResolvedRefs. Conformance test will prompt additional functionality needed.
• What additional stories are needed for conformance? Previous list here: https://github.com/nginxinc/nginx-kubernetes-gateway/issues?q=is%3Aopen+is%3Aissue+label%3Aarea%2Fhttproute%2Fcore
  • Need to watch HTTPRoute partial validity #485 if it is merged.

[laotoutou]

Hi, The edge version doesn't implement URLRewrite yet, does it?

[mpstefan]

Hey @laotoutou, it does not. As URLRewrites are listed as an extended feature of the Gateway API at the moment, we have not prioritized them above any core features. I do not believe we will be getting to them in the near future, as Gateway 1.0 will be dropping soon as well, but you are always welcome to submit a discussion on the topic explaining why it's needed for your use case.

Happy to prioritize if others are also in need!

[winggundamth]

I'm not sure what the status of URLRewrite is right now. Does anyone have a workaround if I want to rewrite the URL?

[pleshakov]

@winggundamth please see #534 (comment)