fix(api)!: accept HEAD and make GET and POST echo the same criteria - #2472
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Two asymmetries in the REST surface, both found while building the gates for #2112 and both cheap to fix now and frozen at GA. The recipe endpoints answered 405 to HEAD while accepting GET. That contradicted RFC 9110 section 9.1, and /metrics inside this same server has allowed the pair since readOnly() was introduced. It surfaced as two documented `curl -I` examples returning 405, caught by the docs replay gate in #2466. HEAD now resolves exactly as GET does; net/http drops the body on the way out, so the client gets the real status and headers. The spec declares the operations, reusing each path's GET parameter list verbatim so the two cannot drift, and Allow now reads "GET, HEAD, POST". Declaring HEAD is additive, so make openapi-diff passes; the baseline is refreshed to accept it. Worth saying plainly in the spec and the reference, because the name invites the opposite assumption: HEAD is not a cheap probe here. It resolves the recipe to produce the headers, so it costs what GET costs. /health and /ready exist for liveness. The second asymmetry: an identical request returned different criteria depending on transport. GET seeds every dimension from NewCriteria, which defaults to "any", before applying query parameters; a decoded POST body leaves unspecified dimensions empty. Resolution was never affected -- Matches treats "any" and "" the same, and both produced identical overlays -- but the echoed criteria object differed, which is a wart to freeze into a v1 contract. Criteria.FillUnsetWithAny normalizes the POST path to match GET. That direction is deliberate: it is additive to the POST response, so nothing reading criteria.os breaks, whereas making GET drop the field would remove data from the more-used path to match the less-used one. The proof is a deletion. TestHandleRecipes_Success compared responses through a helper that stripped "any" from the echo, a crutch added in #2464 precisely because of this bug. It now compares the two bodies byte for byte and the helper is gone; reverting the normalizer fails it. The three documented header-inspection examples go back to curl -I, which is the idiomatic form and was only rewritten in #2466 to work around the 405. The docs gate replays them as real HEAD requests, so the fix is exercised end-to-end by the same gate that caught the bug. Signed-off-by: Mark Chmarny <mark@chmarny.com>
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Included review availability: Your plan provides up to 12 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe API specifications add Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR adds HEAD support and aligns GET/POST criteria responses, with corresponding API, documentation, and test updates; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@api/aicr/v1/server.yaml`:
- Around line 124-129: Update the HEAD response contracts to mirror their paired
GET operations, including GET-equivalent response headers and responses without
content. In api/aicr/v1/server.yaml lines 124-129, add 500 and 504 for HEAD
/v1/recipe; in lines 337-342, add 404, 500, and 504 for HEAD /v1/query. Apply
the corresponding recipe and query contract updates in
api/aicr/v1/server.baseline.yaml lines 137-142 and 350-355.
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The HEAD operations declared 200, 400 and 429 while the handlers route HEAD through the GET resolution path, so every status GET produces HEAD produces too: a missing selector still yields 404 on /v1/query, and both endpoints can still return 500 and 504. The 200 also omitted the response headers, which is the one thing a HEAD request exists to fetch, while its own description claimed GET-equivalent headers. A generated client could not model responses the server really sends. The responses are derived from GET's rather than hand-listed: same statuses, same headers, no content. Hand-listing would have drifted the first time a status was added to GET alone, which is how the gap appeared in the first place. TestOpenAPIHeadMirrorsGetResponses keeps them aligned, and also rejects a HEAD response that declares content. Verified by deleting the 404 from HEAD /v1/query: 'GET /v1/query declares response 404 but HEAD does not'. Declaring more responses is additive, so make openapi-diff passes; the baseline is refreshed to accept it. Signed-off-by: Mark Chmarny <mark@chmarny.com>
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Inline comments:
In `@pkg/server/openapi_routes_test.go`:
- Around line 555-566: Update the response-contract comparison around
get.Responses and head.Responses to require matching status sets in both
directions, reporting statuses declared only by HEAD as well as only by GET. For
each shared status, compare the complete header-name sets rather than only
checking whether HEAD has any headers, using the existing test error reporting
context.
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The gate only detected an entirely empty HEAD header map, so a HEAD 200 carrying just X-Request-Id passed while omitting Cache-Control and the rate-limit headers -- the ones a caller issues HEAD to read in the first place. It also compared statuses in one direction only, so a status declared on HEAD alone described a response the shared handler cannot produce. Both directions now compare full sets: every GET header name must appear on HEAD and vice versa, and the status sets must match. Verified by mutation: trimming HEAD's 200 to a single header reports the four missing names, and adding a HEAD-only 418 reports it against GET. Signed-off-by: Mark Chmarny <mark@chmarny.com>
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Summary
Fixes two REST asymmetries found while building the #2112 gates. Both are cheap now and frozen at GA, which is why they're worth doing before v1 rather than after.
HEADwhile acceptingGET.GETandPOSTechoed differentcriteriafor identical requests.Motivation / Context
HEADcontradicted RFC 9110 §9.1, and/metricsinside this same server has allowed the GET/HEAD pair sincereadOnly()was introduced. It surfaced concretely: two documentedcurl -Iexamples returned 405, caught by the docs replay gate from #2466.The criteria echo differed by transport.
GETseeds every dimension fromrecipe.NewCriteria()(which defaults to"any") before applying query parameters; a decoded POST body leaves unspecified dimensions empty. Resolution was never affected —Criteria.Matchestreats"any"and""identically, and both produced the same overlays — but the echoed object differed, and that is a wart to freeze into a v1 contract.Fixes: N/A
Related: #2112, #2370, #2464, #2466
Type of Change
Marked breaking conservatively:
Allowchanges value and POST responses gain two fields. Both are additive in practice — nothing that worked stops working — and REST has no consumers yet.Component(s) Affected
cmd/aicrd,pkg/server)docs/)Implementation Notes
HEAD
Resolves exactly as
GET;net/httpdrops the body on the way out, so the client gets the real status and headers. The spec declares both operations, reusing each path'sGETparameter list verbatim so the two cannot drift.Allownow readsGET, HEAD, POST.Declaring
HEADis additive, somake openapi-diffpasses on its own; the baseline is refreshed to accept it.Said plainly in both the spec and the reference, because the name invites the opposite assumption:
HEADis not a cheap probe here. It resolves the recipe to produce the headers, so it costs whatGETcosts./healthand/readyexist for liveness.Criteria echo
Criteria.FillUnsetWithAnynormalizes the POST path to match GET. That direction is deliberate: it is additive to the POST response, so nothing readingcriteria.osbreaks. MakingGETdrop the fields instead would remove data from the more-used path to match the less-used one — strictly more risk for the same consistency.The proof is a deletion
TestHandleRecipes_Successcompared the two responses throughnormalizeCriteriaEcho, a helper added in #2464 precisely because of this bug. It now compares the two bodies byte-for-byte and the helper is gone. Its removal is the assertion that the asymmetry stayed fixed.Testing
Mutation-verified, each broken then restored:
MethodHeadfrom the switchAllowtoGET, POSTFillUnsetWithAnyThat last row is the #2461 gate doing its job — it caught the half-landed state before I did.
The three documented header-inspection examples go back to
curl -I, which is idiomatic and was only rewritten in #2466 to work around the 405. The docs gate replays them as real HEAD requests, so the fix is exercised end-to-end by the same gate that caught the bug.Risk Assessment
Two handlers, one helper, spec and docs. No change to resolution, bundling or the CLI.
Checklist
make testwith-race)make lint)git commit -S)