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offline navigations: serve fallback document offline (5/10)#93627

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offline navigations: serve fallback document offline (5/10)#93627
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@feedthejim feedthejim commented May 8, 2026 •
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Stack Position

This is PR 5 of 10. It makes the service worker serve the fallback document when a document request fails offline.

Review guide:
https://gist.github.com/feedthejim/a10f757cf07c5550f731adf2fcf1077b

Full Stack

  1. offline navigations: add gated build primitives (1/10) #93736 offline navigations: add gated build primitives (1/10)
  2. offline navigations: generate fallback document artifacts (2/10) #93737 offline navigations: generate fallback document artifacts (2/10)
  3. offline navigations: register pass-through worker (3/10) #93625 offline navigations: register pass-through worker (3/10)
  4. offline navigations: cache fallback and current-build assets (4/10) #93626 offline navigations: cache fallback and current-build assets (4/10)
  5. This PR: offline navigations: serve fallback document offline (5/10) #93627 offline navigations: serve fallback document offline (5/10)
  6. offline navigations: add router-cache persistence primitives (6/10) #93630 offline navigations: add router-cache persistence primitives (6/10)
  7. offline navigations: persist cached router records (7/10) #93640 offline navigations: persist cached router records (7/10)
  8. offline navigations: bootstrap fallback from router records (8/10) #93644 offline navigations: bootstrap fallback from router records (8/10)
  9. offline navigations: support dynamic route patterns (9/10) #93647 offline navigations: support dynamic route patterns (9/10)
  10. offline navigations: add docs and examples (10/10) #93738 offline navigations: add docs and examples (10/10)

What This Changes

This connects the cached fallback document to failed document requests. When a same-origin navigation cannot reach the server, the service worker can return the generated fallback HTML so the client app has a chance to boot and decide whether the requested route can be reconstructed.

At this point, the client router still cannot reconstruct route data. The expected user-visible behavior is a clear offline miss after the fallback boots.

What Works After This PR

Offline hard reloads can receive the fallback document instead of a browser network error. The UI can show an intentional miss when no router data has been persisted yet.

What Does Not Work Yet

The fallback document cannot restore a prefetched route until router-cache persistence and bootstrap replay land in PRs 6-8.

Reviewer Focus

Please focus on the request boundary: only failed document navigations should fall back to the generated document. The service worker should continue to avoid route semantics and RSC parsing.

Proof in This PR

Fallback document serving and visible miss behavior are covered by:

  • HEADLESS=true pnpm test-start-turbo test/production/app-dir/offline-navigations/offline-navigations.test.ts
  • HEADLESS=true pnpm test-start-webpack test/production/app-dir/offline-navigations/offline-navigations.test.ts

Deferred Coverage

PR 8 turns this fallback boot into successful route reconstruction when the normal client router has already cached the needed records.

Docs Status

The user-facing guide and config reference land in PR 10.

This was referenced May 8, 2026
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github-actions Bot commented May 8, 2026 •
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Tests Passed

Commit: 0c954ca

@feedthejim feedthejim mentioned this pull request May 8, 2026
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@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from 77b9d6f to d4c2b9b Compare May 8, 2026 04:03
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 33c0b95 to 4001039 Compare May 8, 2026 04:03
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Additional Suggestions:

  1. Inline snapshot in NFT test is missing the newly added /node_modules/next/dist/build/offline-navigation-service-worker.js entry, causing CI test failure.
  1. Inline snapshot in next-server-nft test is missing the new /node_modules/next/dist/build/offline-navigation-service-worker.js traced file, causing CI test failure.

Fix on Vercel

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Additional Suggestion:

Inline snapshot in NFT test is missing the newly added /node_modules/next/dist/build/offline-navigation-service-worker.js entry, causing CI test failure.

Fix on Vercel

@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 4001039 to 829dcd8 Compare May 8, 2026 08:12
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from d4c2b9b to baf7074 Compare May 8, 2026 08:12
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 829dcd8 to 1284032 Compare May 8, 2026 17:45
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from baf7074 to b445f31 Compare May 8, 2026 17:45
@feedthejim feedthejim changed the title (6/10) Serve offline navigation fallback document offline navigations: serve fallback document (6/25) May 8, 2026
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 1284032 to f85d95c Compare May 8, 2026 20:30
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from b445f31 to 0e9f50a Compare May 8, 2026 20:30
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@feedthejim feedthejim changed the title offline navigations: serve fallback document (6/25) offline navigations: serve fallback document offline (5/13) May 8, 2026
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Stats from current PR

🔴 1 regression

Metric Canary PR Change Trend
node_modules Size 505 MB 505 MB 🔴 +168 kB (+0%) ▁▁▁██
📊 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
  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 812ms 813ms ✓ ▁▅▅▃▅
Cold (Ready in log) 777ms 778ms ✓ ▆█▂▁▄
Cold (First Request) 1.197s 1.202s ✓ ▄▆▂▂▅
Warm (Listen) 813ms 812ms ✓ ▁▆▆▃▃
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Warm (First Request) 578ms 577ms ✓ ▇█▂▃▅
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
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Cold (Ready in log) 771ms 771ms ✓ ▇▇███
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Warm (Ready in log) 772ms 771ms ✓ ▇▆▇██
Warm (First Request) 3.191s 3.189s ✓ ▅▃▃▇█

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Metric Canary PR Change Trend
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Cached Build 4.724s 4.751s ✓ ▆▅▁▄▅
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

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Fresh Build 23.838s 23.546s ✓ ▅▆▅██
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📎 Tarball URL 
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Commit: 0e9f50a

@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from f85d95c to af1aeea Compare May 9, 2026 00:05
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch 2 times, most recently from 047192c to b61869a Compare May 10, 2026 15:41
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch 2 times, most recently from 1583af3 to ea10d83 Compare May 10, 2026 17:16
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from b61869a to 609a8b3 Compare May 10, 2026 17:16
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from ea10d83 to fe9e691 Compare May 10, 2026 17:42
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch 2 times, most recently from 1d279dc to fd21d23 Compare May 10, 2026 18:45
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 53e06ad to 7e1dae0 Compare May 10, 2026 18:45
@feedthejim feedthejim changed the title offline navigations: serve fallback document offline (5/13) offline navigations: serve fallback document offline (5/10) May 10, 2026
This was referenced May 10, 2026
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@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from fd21d23 to 7c7baff Compare May 10, 2026 19:06
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch 2 times, most recently from 14ed755 to 5a91f11 Compare May 10, 2026 19:36
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from 7c7baff to 141944b Compare May 10, 2026 19:36
@feedthejim feedthejim changed the title offline navigations: serve fallback document offline (5/10) offline navigations: serve fallback document offline (5/11) May 10, 2026
@feedthejim feedthejim mentioned this pull request May 10, 2026
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@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 5a91f11 to cfe3cce Compare May 10, 2026 20:21
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from 141944b to 1274b77 Compare May 10, 2026 20:21
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from cfe3cce to 694e1d0 Compare May 10, 2026 23:28
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from 1274b77 to b5b5f6c Compare May 10, 2026 23:28
@feedthejim feedthejim changed the title offline navigations: serve fallback document offline (5/11) offline navigations: serve fallback document offline (5/10) May 10, 2026
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from b5b5f6c to 67131c2 Compare May 11, 2026 03:04
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 694e1d0 to 1732a28 Compare May 11, 2026 03:04
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-fallback-response branch from 67131c2 to 0c954ca Compare May 11, 2026 04:41
@feedthejim feedthejim force-pushed the feedthejim/offline-navigations-service-worker-cache branch from 1732a28 to 2cb2dd5 Compare May 11, 2026 04:41
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created-by: Next.js team PRs by the Next.js team. tests type: next

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