Clarify if psuedo-headers are supported within HTTP header matching

[hbagdi]

What happened:

Pseudo-headers can be used to specify matches against non-header properties of HTTP requests: #733 (comment)

What you expected to happen:

The documentation of the API clarify if pseudo-headers are supported or not.

How to reproduce it (as minimally and precisely as possible):

N/A

[hbagdi]

Another reason: Pseudo-headers are not very popular (at least I have not encountered them for matching purposes before) so mentioning them explicitly would be helpful to users and maintainers.

[tokers]

/assign

[jpeach]

Validation to reject pseudo headers was added in #772

[youngnick]

oof, that is a good point. That validation will also need to be fixed if we are going to allow pseudo-headers. In that PR, I was slightly in favor of not allowing them in favor of explicit config, but it's not a strong preference.

[hbagdi]

The guidance on this is now present:

gateway-api/apis/v1alpha2/httproute_types.go

Lines 270 to 281 in 5ac109c

	// HTTPHeaderName is the name of an HTTP header.
	//
	// Valid values include:
	//
	// * "Authorization"
	// * "Set-Cookie"
	//
	// Invalid values include:
	//
	// * ":method" - ":" is an invalid character. This means that pseudo headers are
	// not currently supported by this type.
	// * "/invalid" - "/" is an invalid character

/close

[k8s-ci-robot]

@hbagdi: Closing this issue.

In response to this:

The guidance on this is now present:

gateway-api/apis/v1alpha2/httproute_types.go

Lines 270 to 281 in 5ac109c

	// HTTPHeaderName is the name of an HTTP header.
	//
	// Valid values include:
	//
	// * "Authorization"
	// * "Set-Cookie"
	//
	// Invalid values include:
	//
	// * ":method" - ":" is an invalid character. This means that pseudo headers are
	// not currently supported by this type.
	// * "/invalid" - "/" is an invalid character

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.