[release-4.19] OCPBUGS-109620: Add Cache-Control headers to console responses

[jrangelramos]

Summary

• Set restrictive cache headers (no-cache, no-store, must-revalidate + Pragma: no-cache) by default on all responses via securityHeadersMiddleware
• Override with aggressive caching (public, max-age=31536000, immutable) for content-hashed static assets under /static/ via new staticCacheHeaders
• Remove redundant inner securityHeadersMiddleware wrap on the static handler (the outer mux-level middleware already covers it)

Test plan

• go build ./cmd/bridge/... compiles cleanly
• go test ./pkg/server/... — 3 new tests pass:
  • TestSecurityHeadersMiddleware — all 6 headers (4 existing + 2 new)
  • TestStaticCacheHeaders — static handler overrides restrictive defaults
  • TestNonStaticEndpointHasNoCacheHeaders — API endpoints get no-store
• Manual: browser DevTools Network tab confirms index.html gets no-store, /static/ bundles get max-age=31536000

🤖 Generated with Claude Code

[openshift-merge-bot]

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[openshift-ci-robot]

@jrangelramos: This pull request references Jira Issue OCPBUGS-109620, which is invalid:

• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.
• expected Jira Issue OCPBUGS-109620 to depend on a bug targeting a version in 4.20.0, 4.20.z and in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but no dependents were found

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

Summary

• Set restrictive cache headers (no-cache, no-store, must-revalidate + Pragma: no-cache) by default on all responses via securityHeadersMiddleware
• Override with aggressive caching (public, max-age=31536000, immutable) for content-hashed static assets under /static/ via new staticCacheHeaders
• Remove redundant inner securityHeadersMiddleware wrap on the static handler (the outer mux-level middleware already covers it)

Test plan

• go build ./cmd/bridge/... compiles cleanly
• go test ./pkg/server/... — 3 new tests pass:
• TestSecurityHeadersMiddleware — all 6 headers (4 existing + 2 new)
• TestStaticCacheHeaders — static handler overrides restrictive defaults
• TestNonStaticEndpointHasNoCacheHeaders — API endpoints get no-store
• Manual: browser DevTools Network tab confirms index.html gets no-store, /static/ bundles get max-age=31536000

🤖 Generated with Claude Code

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jrangelramos
Once this PR has been reviewed and has the lgtm label, please assign jhadvig for approval. For more information see the Code Review Process.

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[jrangelramos]

/test backend

[openshift-ci]

@jrangelramos: all tests passed!

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