Fix long URLs causing 400s with dynamic routes/rewrites

[ijjk]

This fixes unexpectedly returning 400 for dynamic routes/rewrites for long URLs from checking for a matching page before applying the dynamic route/rewrite. This fixes the file-exists util to consider ENAMETOOLONG as the file not existing since it can't exist if the requested path is longer than the filesystem allows.

Bug

• Related issues linked using fixes #number
• Integration tests added

Fixes: #26204
Fixes: #25481
Fixes: #26090

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
buildDuration	13s	13s	⚠️ +59ms
buildDurationCached	3.2s	3.1s	-125ms
nodeModulesSize	46.4 MB	46.4 MB	⚠️ +91 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.348	2.628	⚠️ +0.28
/ avg req/sec	1064.85	951.2	⚠️ -113.65
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.36	1.34	-0.02
/error-in-render avg req/sec	1838.64	1865.36	+26.72

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	20.2 kB	20.2 kB	✓
webpack-HASH.js gzip	804 B	804 B	✓
Overall change	63 kB	63 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_app-HASH.js gzip	801 B	801 B	✓
_error-HASH.js gzip	3.17 kB	3.17 kB	✓
amp-HASH.js gzip	527 B	527 B	✓
css-HASH.js gzip	329 B	329 B	✓
hooks-HASH.js gzip	903 B	903 B	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.65 kB	1.65 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	8.41 kB	8.41 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_buildManifest.js gzip	391 B	391 B	✓
Overall change	391 B	391 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
index.html gzip	522 B	522 B	✓
link.html gzip	534 B	534 B	✓
withRouter.html gzip	515 B	515 B	✓
Overall change	1.57 kB	1.57 kB	✓

---

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
buildDuration	14.7s	14.8s	⚠️ +67ms
buildDurationCached	4.2s	4.3s	⚠️ +68ms
nodeModulesSize	46.4 MB	46.4 MB	⚠️ +91 B

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	20.2 kB	20.2 kB	✓
webpack-HASH.js gzip	804 B	804 B	✓
Overall change	63 kB	63 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_app-HASH.js gzip	801 B	801 B	✓
_error-HASH.js gzip	3.17 kB	3.17 kB	✓
amp-HASH.js gzip	527 B	527 B	✓
css-HASH.js gzip	329 B	329 B	✓
hooks-HASH.js gzip	903 B	903 B	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.65 kB	1.65 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	8.41 kB	8.41 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_buildManifest.js gzip	391 B	391 B	✓
Overall change	391 B	391 B	✓

Serverless bundles

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_error.js	16.9 kB	16.9 kB	✓
404.html	1.98 kB	1.98 kB	✓
500.html	1.96 kB	1.96 kB	✓
amp.amp.html	10.8 kB	10.8 kB	✓
amp.html	1.17 kB	1.17 kB	✓
css.html	1.35 kB	1.35 kB	✓
hooks.html	1.23 kB	1.23 kB	✓
index.js	17.2 kB	17.2 kB	✓
link.js	17.5 kB	17.5 kB	✓
routerDirect.js	17.3 kB	17.3 kB	✓
withRouter.js	17.3 kB	17.3 kB	✓
Overall change	105 kB	105 kB	✓

---

Webpack 4 Mode (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
buildDuration	11.5s	11.5s	⚠️ +24ms
buildDurationCached	4.6s	4.5s	-80ms
nodeModulesSize	46.4 MB	46.4 MB	⚠️ +91 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.407	2.388	-0.02
/ avg req/sec	1038.76	1046.89	+8.13
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.302	1.346	⚠️ +0.04
/error-in-render avg req/sec	1919.54	1857.14	⚠️ -62.4

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
677f882d2ed8..HASH.js gzip	13.3 kB	13.3 kB	✓
framework.HASH.js gzip	41.8 kB	41.8 kB	✓
main-HASH.js gzip	7.99 kB	7.99 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	63.8 kB	63.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_app-HASH.js gzip	1.07 kB	1.07 kB	✓
_error-HASH.js gzip	3.84 kB	3.84 kB	✓
amp-HASH.js gzip	536 B	536 B	✓
css-HASH.js gzip	333 B	333 B	✓
hooks-HASH.js gzip	910 B	910 B	✓
index-HASH.js gzip	227 B	227 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	295 B	295 B	✓
withRouter-HASH.js gzip	292 B	292 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	9.28 kB	9.28 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
_buildManifest.js gzip	420 B	420 B	✓
Overall change	420 B	420 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js fix/long-url-400	Change
index.html gzip	568 B	568 B	✓
link.html gzip	579 B	579 B	✓
withRouter.html gzip	559 B	559 B	✓
Overall change	1.71 kB	1.71 kB	✓

Commit: 7fb2291