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Strengthen _rsc cache-busting param#92755

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ztanner merged 2 commits intocanaryfrom
04-13-strengthen__rsc_cache-busting_param
Apr 21, 2026
Merged

Strengthen _rsc cache-busting param#92755
ztanner merged 2 commits 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 494 MB 494 MB 🔴 +223 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) 455ms 456ms ▁██▁▁
Cold (Ready in log) 440ms 440ms ▃▃▂▅▄
Cold (First Request) 824ms 826ms ███▁▁
Warm (Listen) 456ms 457ms ▅▅█▅▅
Warm (Ready in log) 440ms 440ms ▆█▆▁▁
Warm (First Request) 338ms 336ms ▅▆▂▁▁
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 456ms 456ms ▁█▁██
Cold (Ready in log) 441ms 442ms ▂▂▆▇█
Cold (First Request) 1.962s 1.952s ▆▅▇▆▆
Warm (Listen) 456ms 456ms ▅██▅▅
Warm (Ready in log) 442ms 441ms ▂▂▇▇█
Warm (First Request) 1.964s 1.982s █▇█▇▇

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.971s 3.953s ▃▁▂▇▄
Cached Build 3.958s 3.933s ▁▃▂▆▅
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.640s 14.613s ▁▄▇▇▆
Cached Build 14.764s 14.753s ▂▃▇█▇
node_modules Size 494 MB 494 MB 🔴 +223 kB (+0%) █████
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script-HASH.js gzip 386 B 386 B
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Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 126 kB 126 kB
page.js gzip 273 kB 273 kB
Total 399 kB 399 kB ✅ -51 B
Middleware
Canary PR Change
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middleware-r..fest.js gzip 156 B 156 B
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index.pack.old gzip 115 kB 115 kB
Total 4.61 MB 4.61 MB ✅ -918 B

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
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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 343 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
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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
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dist_client_...dev.js gzip 317 B 317 B
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pages-api.ru..prod.js gzip 33.5 kB 33.5 kB
pages-turbo....dev.js gzip 53.3 kB 53.3 kB
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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 ⚠️ +2.04 kB
📝 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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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/b2af37575cc8881057de654dca8736f4d3accc83/next

@ztanner ztanner force-pushed the 04-13-strengthen__rsc_cache-busting_param branch 3 times, most recently from 9fab6d8 to a998e11 Compare April 14, 2026 16:23
@ztanner ztanner force-pushed the 04-13-strengthen__rsc_cache-busting_param branch 3 times, most recently from b8bd4a2 to 5a67639 Compare April 15, 2026 23:12
@ztanner ztanner force-pushed the 04-13-strengthen__rsc_cache-busting_param branch from 5a67639 to b2af375 Compare April 15, 2026 23:13
@ztanner ztanner requested a review from gnoff April 21, 2026 16:29
@ztanner ztanner merged commit a430936 into canary Apr 21, 2026
337 of 340 checks passed
@ztanner ztanner deleted the 04-13-strengthen__rsc_cache-busting_param branch April 21, 2026 20:56
ijjk pushed a commit that referenced this pull request Apr 21, 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.
ijjk pushed a commit that referenced this pull request Apr 21, 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.
ijjk added a commit that referenced this pull request Apr 22, 2026
x-ref: #92755

---------

Co-authored-by: Zack Tanner <1939140+ztanner@users.noreply.github.com>
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