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(1/1) Cover offline redirecting server action boundaries#93687

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(1/1) Cover offline redirecting server action boundaries#93687
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Stack Position

This is a focused request-shape stress PR stacked on #93686, (1/1) Cover offline form POST boundaries.

It covers the third small MUTATION-01 row from the offline navigations stress plan: redirecting server action submissions while offline. This PR is intentionally test-only. It does not change service worker routing, fallback boot, server action behavior, or redirect handling.

What Changed

  • Adds does not serve fallback HTML to offline redirecting server action submissions to the offline navigations production e2e suite.
  • Reuses the existing redirecting server action form on the fixture root page.
  • Asserts the POST fails offline before any redirect can be applied, and that generated fallback HTML/cache-miss UI is not served to the mutation.

Behavior Covered

The e2e:

  1. Builds and starts the offline navigations fixture.
  2. Loads /docs online and waits for the generated service worker.
  3. Registers a listener for next-offline-navigation-fallback-served messages.
  4. Switches the browser context offline.
  5. Submits the existing redirecting server action form.
  6. Waits for the POST request to fail with an offline network error.
  7. Asserts no fallback-served message was emitted.
  8. Asserts generated fallback/cache-miss UI did not render.
  9. Asserts the redirect search param was not applied.
  10. Asserts the current app page remains intact.

This protects the service worker contract for redirecting unsafe mutations: the offline fallback is a document survival layer, not a substitute response for action POSTs, even if the online action would redirect after mutation.

Intentionally Not Covered Yet

  • Route-handler mutation side effects beyond the form POST pass-through covered in (1/1) Cover offline form POST boundaries #93686.
  • Reconnect retry after a failed offline mutation.
  • Successful online retry invalidating durable offline records.

Verification

  • pnpm prettier --with-node-modules --ignore-path .prettierignore --write test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • npx eslint --config eslint.config.mjs --fix test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • git diff --check -- test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • NEXT_SKIP_ISOLATE=1 pnpm test-start-turbo test/production/app-dir/offline-navigations/offline-navigations.test.ts -t "does not serve fallback HTML to offline redirecting server action submissions"
  • pnpm test-start-webpack test/production/app-dir/offline-navigations/offline-navigations.test.ts -t "does not serve fallback HTML to offline redirecting server action submissions"
  • pnpm --filter=next build
  • clean rerun after build: NEXT_SKIP_ISOLATE=1 pnpm test-start-turbo test/production/app-dir/offline-navigations/offline-navigations.test.ts -t "does not serve fallback HTML to offline redirecting server action submissions"
  • commit hook: lint-staged reran prettier and eslint for the touched file

@github-actions github-actions Bot added created-by: Next.js team PRs by the Next.js team. tests labels May 8, 2026
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-offline-form-boundary-stress branch from f4551c0 to 3052078 Compare May 8, 2026 12:22
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-offline-redirect-action-boundary-stress branch from 98a9d90 to bcff5d1 Compare May 8, 2026 12:22
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Stats from current PR

🔴 2 regressions

Metric Canary PR Change Trend
node_modules Size 505 MB 508 MB 🔴 +2.69 MB (+1%) ▁▁▁▁▁
Webpack Build Time (cached) 23.667s 24.409s 🔴 +742ms (+3%) █▄▄▅▆
📊 All Metrics
📖 Metrics Glossary

Dev Server Metrics:

  • Listen = TCP port starts accepting connections
  • First Request = HTTP server returns successful response
  • Cold = Fresh build (no cache)
  • Warm = With cached build artifacts

Build Metrics:

  • Fresh = Clean build (no .next directory)
  • Cached = With existing .next directory

Change Thresholds:

  • Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
  • Size: Changes < 1KB AND < 1% are insignificant
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⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 810ms 810ms ▅▅▁▅▅
Cold (Ready in log) 783ms 783ms ▁▅▇█▂
Cold (First Request) 1.233s 1.227s ▁▄▄▆▂
Warm (Listen) 810ms 810ms ▆▃▁▆▆
Warm (Ready in log) 782ms 785ms ▁▅▆█▂
Warm (First Request) 603ms 607ms ▁▅▇█▂
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 813ms 812ms █████
Cold (Ready in log) 780ms 784ms █████
Cold (First Request) 3.206s 3.236s ▇▇█▆▅
Warm (Listen) 812ms 812ms █████
Warm (Ready in log) 781ms 783ms ███▇█
Warm (First Request) 3.248s 3.252s ▆▇█▅▄

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.783s 4.741s ▃██▆▁
Cached Build 4.747s 4.813s ▃▃▆▅▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 23.705s 24.112s █▆▅▆▆
Cached Build 23.667s 24.409s 🔴 +742ms (+3%) █▄▄▅▆
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📝 Changed Files (9 files)

Files with changes:

  • app-page-exp..ntime.dev.js
  • app-page-exp..time.prod.js
  • app-page-tur..ntime.dev.js
  • app-page-tur..time.prod.js
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  • app-page-tur..time.prod.js
  • app-page.runtime.dev.js
  • app-page.runtime.prod.js
  • server.runtime.prod.js
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/bcff5d17e508b9bc3367ede34887cf767d1bab12/next

Commit: bcff5d1

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Commit: bcff5d1 | About building and testing Next.js

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Closing this draft as part of the offline navigations first-usable restack.

The current review stack is the 25-PR sequence rooted at #93622, ending at #93656, with #93648 folded into PR 22 and the stress-only rows deferred into named P1/P2 owners. The branch is intentionally left intact so the coverage can be recovered or rebundled later.

Review guide: https://gist.github.com/feedthejim/b3d9fe26a7c05655fd57adcce371b93d

@feedthejim feedthejim closed this May 8, 2026
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