[16.3.x] Return client errors for unrecognized Server Actions - #98491
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icyJoseph wants to merge 1 commit into
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[16.3.x] Return client errors for unrecognized Server Actions#98491icyJoseph wants to merge 1 commit into
icyJoseph wants to merge 1 commit into
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## Summary - return `400 Bad Request` when a Server Action reference ID does not match the expected format - return `409 Conflict` when a well-formed action ID is unavailable in the current deployment, including deployment skew - apply the same classification to IDs from the `Next-Action` header and multipart MPA forms, including direct and bound actions in Node and Edge runtimes - return generic text bodies matching the client error category, without exposing action-ID details - derive marked forwarded-action responses from the original action ID so an unexpected or mixed-version worker response cannot change the client error semantics Fetch actions previously had dedicated 404 handling, while equivalent MPA form submissions fell through to the generic error path and returned 500. This removes that transport-dependent behavior and distinguishes malformed or scanning traffic from legitimate stale clients without treating either case as a missing page or an internal server failure. ## Verification - `pnpm test-dev-turbo test/e2e/app-dir/actions-unrecognized/actions-unrecognized.test.ts` - `pnpm test-dev-turbo test/e2e/app-dir/actions/app-action.test.ts -t 'forward.*action'` - `pnpm test-start-turbo test/e2e/app-dir/actions-unrecognized/actions-unrecognized.test.ts` - `pnpm test-dev-webpack test/e2e/app-dir/actions-unrecognized/actions-unrecognized.test.ts` - `pnpm test-dev-turbo test/e2e/app-dir/no-server-actions/no-server-actions.test.ts` <!-- NEXT_JS_LLM --> (cherry picked from commit 65c832c)
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Tests PassedCommit: 7d5b668 |
icyJoseph
marked this pull request as ready for review
September 10, 2026 08:44
eps1lon
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Backports #98123 ("Return client errors for unrecognized Server Actions") to
next-16-3.