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Strengthen _rsc cache-busting param#92755

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04-13-strengthen__rsc_cache-busting_param
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Strengthen _rsc cache-busting param#92755
ztanner wants to merge 1 commit intocanaryfrom
04-13-strengthen__rsc_cache-busting_param

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@ztanner ztanner commented Apr 13, 2026

This updates _rsc cache-busting param generation to use a stronger digest so different RSC request variants are much less likely to produce the same value.

It also updates the related request-validation and injected resume/instant-test paths so they continue to generate and validate the same _rsc values across client, server, and edge-reachable codepaths.

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ztanner commented Apr 13, 2026

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nextjs-bot commented Apr 13, 2026

Tests Passed

@ztanner ztanner force-pushed the 04-13-strengthen__rsc_cache-busting_param branch from 338e1bb to d0a321d Compare April 13, 2026 23:36
@ztanner ztanner marked this pull request as ready for review April 14, 2026 14:20
@ztanner ztanner requested a review from ijjk April 14, 2026 14:21
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nextjs-bot commented Apr 14, 2026

Stats from current PR

🔴 1 regression

Metric Canary PR Change Trend
node_modules Size 493 MB 494 MB 🔴 +127 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) 454ms 456ms █▁▁▁▁
Cold (Ready in log) 444ms 442ms ▅▅▃▄▁
Cold (First Request) 1.099s 1.097s ▁▁█▁█
Warm (Listen) 456ms 457ms ▁▁▁▁▁
Warm (Ready in log) 441ms 441ms ▃▂▆▂▅
Warm (First Request) 341ms 346ms ▃▂▆▄▅
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 456ms 455ms ▅▅▁▅▅
Cold (Ready in log) 441ms 440ms ▁█▁▁▁
Cold (First Request) 1.892s 1.892s ▁█▁▄▃
Warm (Listen) 457ms 455ms ▁▃▃▃▃
Warm (Ready in log) 440ms 441ms ▁█▂▁▁
Warm (First Request) 1.889s 1.908s ▁█▁▃▂

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.957s 3.917s ▅▄▄▆▃
Cached Build 3.913s 3.964s ▅▆▁█▂
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.638s 14.584s ▁█▁▁▂
Cached Build 14.694s 14.734s ▁█▁▁▁
node_modules Size 493 MB 494 MB 🔴 +127 kB (+0%) ███▁▁
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles
Canary PR Change
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Canary PR Change
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Total 716 B 717 B ⚠️ +1 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 435 B 434 B
Total 435 B 434 B ✅ -1 B

📦 Webpack

Client

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Canary PR Change
2637-HASH.js gzip 4.63 kB N/A -
7724.HASH.js gzip 169 B N/A -
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8817-HASH.js gzip 5.59 kB N/A -
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Polyfills
Canary PR Change
polyfills-HASH.js gzip 39.4 kB 39.4 kB
Total 39.4 kB 39.4 kB
Pages
Canary PR Change
_app-HASH.js gzip 193 B 193 B
_error-HASH.js gzip 182 B 182 B
css-HASH.js gzip 333 B 334 B
dynamic-HASH.js gzip 1.81 kB 1.8 kB
edge-ssr-HASH.js gzip 255 B 255 B
head-HASH.js gzip 353 B 349 B 🟢 4 B (-1%)
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image-HASH.js gzip 581 B 581 B
index-HASH.js gzip 260 B 259 B
link-HASH.js gzip 2.51 kB 2.51 kB
routerDirect..HASH.js gzip 316 B 318 B
script-HASH.js gzip 386 B 386 B
withRouter-HASH.js gzip 313 B 314 B
1afbb74e6ecf..834.css gzip 106 B 106 B
Total 7.98 kB 7.97 kB ✅ -10 B

Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 126 kB 126 kB
page.js gzip 273 kB 273 kB
Total 399 kB 398 kB ✅ -393 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 617 B 615 B
middleware-r..fest.js gzip 156 B 156 B
middleware.js gzip 43.8 kB 44.2 kB
edge-runtime..pack.js gzip 842 B 842 B
Total 45.4 kB 45.8 kB ⚠️ +385 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 721 B 720 B
Total 721 B 720 B ✅ -1 B
Build Cache
Canary PR Change
0.pack gzip 4.38 MB 4.37 MB 🟢 5.86 kB (0%)
index.pack gzip 113 kB 113 kB
index.pack.old gzip 115 kB 112 kB 🟢 3.41 kB (-3%)
Total 4.6 MB 4.59 MB ✅ -10 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 346 kB 346 kB
app-page-exp..prod.js gzip 192 kB 192 kB
app-page-tur...dev.js gzip 346 kB 346 kB
app-page-tur..prod.js gzip 192 kB 192 kB
app-page-tur...dev.js gzip 342 kB 342 kB
app-page-tur..prod.js gzip 190 kB 190 kB
app-page.run...dev.js gzip 343 kB 343 kB
app-page.run..prod.js gzip 190 kB 190 kB
app-route-ex...dev.js gzip 77 kB 77 kB
app-route-ex..prod.js gzip 52.5 kB 52.5 kB
app-route-tu...dev.js gzip 77.1 kB 77.1 kB
app-route-tu..prod.js gzip 52.6 kB 52.6 kB
app-route-tu...dev.js gzip 76.7 kB 76.7 kB
app-route-tu..prod.js gzip 52.3 kB 52.3 kB
app-route.ru...dev.js gzip 76.6 kB 76.6 kB
app-route.ru..prod.js gzip 52.3 kB 52.3 kB
dist_client_...dev.js gzip 324 B 324 B
dist_client_...dev.js gzip 326 B 326 B
dist_client_...dev.js gzip 318 B 318 B
dist_client_...dev.js gzip 317 B 317 B
pages-api-tu...dev.js gzip 43.9 kB 44 kB
pages-api-tu..prod.js gzip 33.5 kB 33.5 kB
pages-api.ru...dev.js gzip 43.9 kB 43.9 kB
pages-api.ru..prod.js gzip 33.5 kB 33.5 kB
pages-turbo....dev.js gzip 53.3 kB 53.3 kB
pages-turbo...prod.js gzip 39.1 kB 39.1 kB
pages.runtim...dev.js gzip 53.3 kB 53.3 kB
pages.runtim..prod.js gzip 39.1 kB 39.1 kB
server.runti..prod.js gzip 62.9 kB 62.9 kB
Total 3.06 MB 3.06 MB ⚠️ +600 B
📝 Changed Files (25 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
  • app-page-tur..ntime.dev.js
  • app-page-tur..time.prod.js
  • app-page.runtime.dev.js
  • app-page.runtime.prod.js
  • app-route-ex..ntime.dev.js
  • app-route-ex..time.prod.js
  • app-route-tu..ntime.dev.js
  • app-route-tu..time.prod.js
  • app-route-tu..ntime.dev.js
  • app-route-tu..time.prod.js
  • app-route.runtime.dev.js
  • app-route.ru..time.prod.js
  • pages-api-tu..ntime.dev.js
  • pages-api-tu..time.prod.js
  • pages-api.runtime.dev.js
  • pages-api.ru..time.prod.js
  • ... and 5 more
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app-page-tur..ntime.dev.js
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app-page-tur..ntime.dev.js
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app-page.runtime.dev.js
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app-page.runtime.prod.js
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app-route-ex..ntime.dev.js

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app-route-ex..time.prod.js

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app-route-tu..ntime.dev.js

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app-route-tu..time.prod.js

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app-route-tu..ntime.dev.js

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app-route-tu..time.prod.js

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app-route.runtime.dev.js

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app-route.ru..time.prod.js

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pages-api-tu..ntime.dev.js

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pages-api-tu..time.prod.js

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pages-api.runtime.dev.js

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pages-api.ru..time.prod.js

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pages-turbo...ntime.dev.js

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pages-turbo...time.prod.js

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pages.runtime.dev.js

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pages.runtime.prod.js

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server.runtime.prod.js

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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/a998e11a798ab22171e00bd0fba7e3cb4d3a2ffd/next

@ztanner ztanner force-pushed the 04-13-strengthen__rsc_cache-busting_param branch 2 times, most recently from d03d722 to 9fab6d8 Compare April 14, 2026 15:53
@ztanner ztanner force-pushed the 04-13-strengthen__rsc_cache-busting_param branch from 9fab6d8 to a998e11 Compare April 14, 2026 16:23
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