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Preserve deferred 406 Not Acceptable responses in Nuxt and SolidStart - #1279
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Nuxt's error handler can bypass the response hook, and SolidStart's hook runs before a returned Response sets the event status. Restore deferred 406s on these paths while preserving successful responses and deliberate Nuxt server route 404s. Cover route misses, renderer misses, returned and thrown 404s, response headers and cookies, and per-request cleanup with regression tests. Fixes fedify-dev#1278 Assisted-by: Codex:gpt-6.1-sol Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-opus-5-5
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📝 WalkthroughWalkthroughNuxt and SolidStart now restore deferred ChangesNuxt deferred response restoration
SolidStart deferred response restoration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Client
participant H3
participant NuxtPlugin
participant NitroErrorHandler
Client->>H3: Send request with Accept header
H3->>NuxtPlugin: Provide deferred flag and response status
NitroErrorHandler->>NuxtPlugin: Invoke wrapped error handler
NuxtPlugin->>H3: Send eligible 406 response
H3-->>Client: Return response
sequenceDiagram
participant Client
participant FedifyMiddleware
participant SolidStart
participant ServerResponse
Client->>FedifyMiddleware: Send request
FedifyMiddleware->>ServerResponse: Install interception for deferred 406
SolidStart->>FedifyMiddleware: Provide handled state and response outcome
FedifyMiddleware->>SolidStart: Replace eligible 404 payload with 406
ServerResponse-->>Client: Send response
ServerResponse->>FedifyMiddleware: Run interception cleanup on end or close
Merge Risk: 🔵 Low · up to A SolidStart handler returning an empty 204 response can instead return 406. This narrow case should be fixed, but it does not prevent merging with owner acceptance. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 18.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 8 files. (6 skipped: 6 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @packages/solidstart/src/index.ts:
- Around line 107-117: Update the status selection in the onBeforeResponse hook
so an undefined body with event.response.status equal to 204 preserves the 204
response instead of triggering the deferred 406. Keep the existing 404 fallback
for other undefined-body cases and leave the remaining status logic unchanged.
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📒 Files selected for processing (14)
CHANGES.mdchanges.d/nuxt/deferred-not-acceptable.mdchanges.d/solidstart/deferred-not-acceptable.mdpackages/nuxt/deno.jsonpackages/nuxt/src/runtime/server/lib.tspackages/nuxt/src/runtime/server/lifecycle.test.tspackages/nuxt/src/runtime/server/plugin.test.tspackages/nuxt/src/runtime/server/plugin.tspackages/solidstart/deno.jsonpackages/solidstart/package.jsonpackages/solidstart/src/index.test.tspackages/solidstart/src/index.tspackages/solidstart/src/response.test.tspackages/solidstart/src/response.ts
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Handlers can return undefined after setting 204, a redirect, or a server error status. Keep those explicit statuses while retaining the default status route-miss fallback to 406. Exercise matched H3 routes, including null-body 204 responses, through SolidStart's real middleware wrapper. fedify-dev#1279 (comment) fedify-dev#1279 (comment) Assisted-by: Codex:gpt-6.1-sol
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Replacing a framework's 404 body invalidates its Content-Digest and legacy Digest headers. Remove both when restoring the deferred 406 in Nuxt and SolidStart, including buffered errors that bypass response hooks. Regression tests cover both header sources and confirm that ordinary responses and streams with committed headers retain their digests. fedify-dev#1279 (comment) Assisted-by: Codex:gpt-6.1-sol
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Fedify lets the framework try an alternative representation after rejecting an
Acceptheader. If that fallback ends in a404 Not Found, the adapters now restore the deferred406 Not Acceptableso clients receive the negotiation failure instead of a misleading “not found.”Nuxt handles renderer failures before Nitro sends its error response, while preserving explicit server-route 404s. SolidStart uses the returned response’s status and replaces the H3 response payload; a request-local
res.endinterceptor also catches buffered thrown 404s that bypass the response hook. Both adapters remove stale representation headers and preserve cookies andVaryvalues.Closes #1278.