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Delegating requests with an unsupported Accept header lost the 406 fallback when application routing found no representation. Apply it only to unhandled framework responses, preserving application 404s, async handlers and error hooks. Merge Vary: Accept and replace stale body metadata when supplying the fallback. Exercise real Express, NestJS, Koa, Hono and Elysia pipelines, including HEAD requests, explicit 404s, streams and nested error hooks. Add the test support and changelog entries for these integrations. Fixes fedify-dev#1277 Assisted-by: Codex:gpt-6.1-sol Assisted-by: OpenCode:deepseek-flash Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-opus-5-5
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughFive framework adapters now return a 406 fallback when Federation rejects an unsupported ChangesUnsupported Accept fallback
Priority: ⬆️ High Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to A standard single-middleware Hono setup may still return 404 instead of 406 for unsupported Accept headers; verify this path before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Out of Scope Changes checkExplanation The adapter changes, regression tests, package setup, changelogs, and Hono documentation support [
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Inline comments:
Review comments at @CHANGES.md:
- Line 52: Update the Koa entry so there are two spaces after the period in
“unsupported `Accept` header.”, matching the spacing used by the other entries.
Review comments at @packages/elysia/src/index.ts:
- Around line 80-93: Guard the loop following the `notAcceptableFallback` lookup
so it skips iteration when `findIndex` returns a negative index. Preserve the
existing later-hook processing when the hook is found.
Review comments at @packages/hono/src/mod.ts:
- Around line 94-141: When `observing` is false, the middleware cannot detect
Hono’s default 404 and convert it to 406; emit a debug diagnostic in that branch
to make the loss of observation explicit. Keep the existing observation and
response-handling behavior unchanged.
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CHANGES.mdchanges.d/elysia/not-acceptable-fallback.mdchanges.d/express/not-acceptable-fallback.mdchanges.d/hono/not-acceptable-fallback.mdchanges.d/koa/not-acceptable-fallback.mdchanges.d/nestjs/not-acceptable-fallback.mddeno.jsonpackages/elysia/package.jsonpackages/elysia/src/fallback.test.tspackages/elysia/src/index.tspackages/express/package.jsonpackages/express/src/fallback.test.tspackages/express/src/index.tspackages/hono/package.jsonpackages/hono/src/fallback.test.tspackages/hono/src/mod.tspackages/koa/package.jsonpackages/koa/src/fallback.test.tspackages/koa/src/index.tspackages/nestjs/package.jsonpackages/nestjs/src/fallback.test.tspackages/nestjs/src/fedify.middleware.ts
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Downstream middleware can commit headers before invoking a saved end function. Observe end assignments so the terminal 404 is classified and replaced before those wrappers run, preserving their response handling. Exercise GET and HEAD through a wrapper that commits headers first, including application 404s and successful responses. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
A wrapped fallback registration cannot be found by function identity. Skip manual replay in that case so earlier application error hooks are not called a second time. Cover wrapped registrations in both AOT and dynamic modes, while retaining the existing later-hook behavior. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
Use the same two-space sentence separator as the other integration entries in both the fragment and its materialized changelog entry. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
Hono's default not-found handler uses the same text helper applications can call deliberately. Preserve responses when public route metadata identifies an application route, including its terminal 404 after next(). Document this conservative boundary and test explicit default-text 404s, route delegation, and preservation when response observation is unavailable. fedify-dev#1280 (comment) fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol Assisted-by: Claude Code:claude-opus-5-5
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A downstream end wrapper can commit headers before invoking the saved fallback. Observe later end assignments so Nest's terminal 404 is replaced before that wrapper runs, retaining the downstream call chain. Exercise GET and HEAD through a header-committing wrapper, including application JSON 404s and successful controller responses. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
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A middleware's transformed stream cannot safely be distinguished from an application-authored 404 replacement. Keep the conservative ownership rule for later response assignments instead of retaining the terminal marker across them. Cover same-body response copies, stream wrappers and custom HTML bodies so this preservation boundary is explicit across supported runtimes. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
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Fetch-mock rejects an aborted request while its delayed response timer keeps running. That timer can finish in a later test and trigger Deno's leak sanitizer. Clear it in finally, reset the mock on failures, and restore the cancellation test's resource and operation checks. https://github.com/fedify-dev/fedify/actions/runs/37948628519/job/113881481232 Assisted-by: Codex:gpt-6.1-sol
Deno runs sibling task dependencies concurrently. The prerequisite pnpm builds previously raced pnpm install, which can rewrite executable shims while a build starts and fail with tsdown permission errors. Make each prerequisite build depend on install so all shim updates and installation lifecycle scripts finish before those builds run. https://github.com/fedify-dev/fedify/actions/runs/37948628519/job/113881481612 Assisted-by: Codex:gpt-6.1-sol
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Inline comments:
Review comments at @packages/hono/src/mod.ts:
- Line 103: Update the guard involving `route.method` and `route.path` so
wildcard middleware does not trigger the fallback that replaces an
application-generated 404 with 406 when response ownership is ambiguous. Add a
regression test proving that a request rejected by a wildcard middleware handler
returning 404 retains that response.
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CHANGES.mdchanges.d/hono/not-acceptable-fallback.mdchanges.d/koa/not-acceptable-fallback.mddeno.jsondocs/manual/integration.mdpackages/elysia/src/fallback.test.tspackages/elysia/src/index.tspackages/express/src/fallback.test.tspackages/express/src/index.tspackages/fedify/src/utils/docloader.test.tspackages/hono/src/fallback.test.tspackages/hono/src/mod.tspackages/nestjs/src/fallback.test.tspackages/nestjs/src/fedify.middleware.ts
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Wildcard middleware can return the same text as Hono's private not-found handler, so observing the response cannot prove its owner. Preserve 404 responses whenever another downstream handler matches, including handlers that delegate to the default not-found handler. Keep the 406 fallback when no downstream handler matches. Cover wildcard responses and delegation, and document middleware ordering. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
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Regarding the scope check: the cancellation-test cleanup in packages/fedify/src/utils/docloader.test.ts fixes the failing |
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Inline comments:
Review comments at @packages/hono/src/mod.ts:
- Line 104: Update the matched-route handling around matchedRoutes and
routeIndex so a sole matched middleware is treated as route index zero when Hono
leaves routeIndex unset; preserve the existing not-found behavior when no route
matches. Add a pipeline test where app.use(federation(...)) is the only matching
handler and verify the 406 fallback is applied.
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CHANGES.mdchanges.d/hono/not-acceptable-fallback.mddocs/manual/integration.mdpackages/hono/src/fallback.test.tspackages/hono/src/mod.ts
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Hono bypasses compose() when only the federation middleware matches, but HonoRequest initializes routeIndex to zero on that path too. The existing guard already permits the 406 fallback. Exercise this path without any additional middleware, checking the 406 body and headers and preserving 404s for unmatched URLs. fedify-dev#1280 (comment) Assisted-by: Codex:gpt-6.1-sol
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Requests with an unsupported
Acceptheader could end in a framework's default404 Not Foundwhen the application left them unhandled. This change waits for routing to finish and distinguishes default not-found responses from application responses before returning406 Not Acceptable, preserving application-authored 404s and error hooks.The fallback merges
Acceptinto the existingVaryheader and replaces stale body metadata. Regression tests exercise real Express, NestJS, Koa, Hono, and Elysia pipelines, including HEAD requests and custom 404s, on supported Deno, Node.js, and Bun targets.Fixes #1277.