All committers have signed the CLA.

Thanks for your contribution @joelact.
While a headers are case-insensitive according to the RFC it's a contention to have them Title-cased.

Your change includes a schema change, which requires additional steps to ensure backwards compatibility with older Kong versions. If you choose to follow-up on those, I'm happy to assist you in doing so.
Alternatively, we'll pick up the PR and continue from here. Up to you @joelact

Hey @jschmid1. Thanks for taking a look at this.
I want to continue working on this PR so can you tell me the next steps to get this going?

Sure @joelact, Your change qualifies as a "rename" of a field. To ensure compatibility to older versions when running Kong in hybrid-mode you have to teach the Kong how to manipulate the plugin config so that older versions still understand it.

You can take a look at the compatibility checkers here -> https://github.com/Kong/kong/blob/master/kong/clustering/compat/checkers.lua

and for testing check this file -> https://github.com/Kong/kong/blob/master/spec/02-integration/09-hybrid_mode/09-config-compat_spec.lua

Hey @jschmid1! Sorry for the delay in completing the mentioned actions. When possible can you review this again?

Looks good, waiting for the CI to turn green. 👍🏼

From https://github.com/Kong/kong/actions/runs/9221338444/job/25446686155?pr=12812

File (kong/plugins/proxy-cache/clustering/compat/response_headers_translation.lua) not found in rockspec (kong-3.8.0-0.rockspec)

You need to add this file to the rockspec.

@jschmid1 added file to rockspec.

Cherry-pick failed for master, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git remote add upstream https://github.com/kong/kong-ee
git fetch upstream master
git worktree add -d .worktree/cherry-pick-12812-to-master-to-upstream upstream/master
cd .worktree/cherry-pick-12812-to-master-to-upstream
git checkout -b cherry-pick-12812-to-master-to-upstream
ancref=$(git merge-base d73a83534495078e09ebb39c975b6e349a8e2655 0f4a5fe00f33e121c0271cfbf92a6f5d28aec620)
git cherry-pick -x $ancref..0f4a5fe00f33e121c0271cfbf92a6f5d28aec620

Thanks for your contribution, much appreciated @joelact