bugfix/i18n Do not support the second locale in the pathname

[vordgi]

Bug

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

Fixes: #31228

[vordgi]

fixes #31228

[ijjk]

Hi, can you add an integration test in https://github.com/vercel/next.js/tree/canary/test/integration/i18n-support to ensure this is working properly?

[vordgi]

Hello, done. What are the next steps? (it's my first PR here)
What should I do and what will happen with the task (the type task is still "template")?

[ijjk]

Change and added test looks good thanks for the PR!

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall decrease ✓

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
buildDuration	31.3s	30s	-1.3s
buildDurationCached	6.4s	6.9s	⚠️ +554ms
nodeModulesSize	334 MB	334 MB	-25 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
/ failed reqs	0	0	✓
/ total time (seconds)	5.491	4.356	-1.13
/ avg req/sec	455.31	573.95	+118.64
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	4.291	2.47	-1.82
/error-in-render avg req/sec	582.63	1012.04	+429.41

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	28.3 kB	28.3 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.2 kB	72.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
_app-HASH.js gzip	1.37 kB	1.37 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.38 kB	2.38 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	635 B	635 B	✓
image-HASH.js gzip	4.44 kB	4.44 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.87 kB	1.87 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	13.3 kB	13.3 kB	✓

Client Build Manifests

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
index.html gzip	523 B	523 B	✓
link.html gzip	535 B	535 B	✓
withRouter.html gzip	517 B	517 B	✓
Overall change	1.57 kB	1.57 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall decrease ✓

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
buildDuration	28.6s	36.6s	⚠️ +8s
buildDurationCached	8.5s	4.5s	-4s
nodeModulesSize	334 MB	334 MB	-25 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.996	7.452	⚠️ +2.46
/ avg req/sec	500.38	335.47	⚠️ -164.91
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	2.076	2.886	⚠️ +0.81
/error-in-render avg req/sec	1204.41	866.12	⚠️ -338.29

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.5 kB	28.5 kB	✓
webpack-HASH.js gzip	1.43 kB	1.43 kB	✓
Overall change	72.5 kB	72.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.38 kB	2.38 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	622 B	622 B	✓
image-HASH.js gzip	4.46 kB	4.46 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	1.91 kB	1.91 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	13.2 kB	13.2 kB	✓

Client Build Manifests

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	vordgi/next.js bugfix/second-locale-in-pathname	Change
index.html gzip	522 B	522 B	✓
link.html gzip	534 B	534 B	✓
withRouter.html gzip	516 B	516 B	✓
Overall change	1.57 kB	1.57 kB	✓

Commit: 73f7d15