use 303 status code for redirects in fetch actions

[ztanner]

What?

A redirect that occurs during a fetch action will get a status code of 200, while the redirection logic is handled client-side.

Why?

In this scenario, the redirect is handled by the client router, so no Location is set on the action response. However for debugging / logging purposes, it'd be useful to still return the same status code used in other cases (see #58885)

How?

Rather than selectively setting the status to 303 in the non-fetch action case, this always applies it.

Closes NEXT-1745

[ztanner]

Current dependencies on/for this PR:

• canary
  • PR remove duplicate util file for redirect status #58878
    • PR unify server action detection logic #58879
      • PR update status codes for redirect and permanentRedirect in action handlers #58885
        • PR use 303 status code for redirects in fetch actions #59017 👈
        • PR verify action id before parsing body #58977

This stack of pull requests is managed by Graphite.

[ijjk]

Stats from current PR

Default Build

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
buildDuration	10.2s	10.2s	N/A
buildDurationCached	5.9s	6s	N/A
nodeModulesSize	199 MB	199 MB	⚠️ +1.02 kB
nextStartRea..uration (ms)	427ms	420ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
199-HASH.js gzip	30.7 kB	30.7 kB	N/A
3f784ff6-HASH.js gzip	53.3 kB	53.3 kB	✓
494.HASH.js gzip	180 B	181 B	N/A
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	241 B	240 B	N/A
main-HASH.js gzip	31.7 kB	31.7 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	✓
Overall change	100 kB	100 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
_app-HASH.js gzip	194 B	195 B	N/A
_error-HASH.js gzip	182 B	181 B	N/A
amp-HASH.js gzip	501 B	503 B	N/A
css-HASH.js gzip	322 B	323 B	N/A
dynamic-HASH.js gzip	2.5 kB	2.5 kB	✓
edge-ssr-HASH.js gzip	253 B	255 B	N/A
head-HASH.js gzip	348 B	347 B	N/A
hooks-HASH.js gzip	369 B	368 B	N/A
image-HASH.js gzip	4.27 kB	4.27 kB	N/A
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	2.61 kB	2.6 kB	N/A
routerDirect..HASH.js gzip	311 B	311 B	✓
script-HASH.js gzip	384 B	383 B	N/A
withRouter-HASH.js gzip	307 B	308 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.17 kB	3.17 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
_buildManifest.js gzip	484 B	483 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
index.html gzip	529 B	527 B	N/A
link.html gzip	540 B	540 B	✓
withRouter.html gzip	525 B	523 B	N/A
Overall change	540 B	540 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
edge-ssr.js gzip	92.6 kB	92.6 kB	N/A
page.js gzip	145 kB	145 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
middleware-b..fest.js gzip	624 B	624 B	✓
middleware-r..fest.js gzip	150 B	151 B	N/A
middleware.js gzip	35.7 kB	35.7 kB	✓
edge-runtime..pack.js gzip	1.92 kB	1.92 kB	✓
Overall change	38.3 kB	38.3 kB	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js 11-28-use_303_status_code_for_redirects_in_fetch_actions	Change
app-page-exp...dev.js gzip	168 kB	168 kB	✓
app-page-exp..prod.js gzip	93.6 kB	93.6 kB	✓
app-page-tur..prod.js gzip	94.4 kB	94.4 kB	N/A
app-page-tur..prod.js gzip	88.9 kB	88.9 kB	✓
app-page.run...dev.js gzip	138 kB	138 kB	✓
app-page.run..prod.js gzip	88.3 kB	88.3 kB	✓
app-route-ex...dev.js gzip	24.2 kB	24.2 kB	✓
app-route-ex..prod.js gzip	16.8 kB	16.8 kB	✓
app-route-tu..prod.js gzip	16.9 kB	16.9 kB	✓
app-route-tu..prod.js gzip	16.4 kB	16.4 kB	✓
app-route.ru...dev.js gzip	23.6 kB	23.6 kB	✓
app-route.ru..prod.js gzip	16.4 kB	16.4 kB	✓
pages-api-tu..prod.js gzip	9.37 kB	9.37 kB	✓
pages-api.ru...dev.js gzip	9.64 kB	9.64 kB	✓
pages-api.ru..prod.js gzip	9.37 kB	9.37 kB	✓
pages-turbo...prod.js gzip	21.9 kB	21.9 kB	✓
pages.runtim...dev.js gzip	22.6 kB	22.6 kB	✓
pages.runtim..prod.js gzip	21.9 kB	21.9 kB	✓
server.runti..prod.js gzip	49.3 kB	49.3 kB	✓
Overall change	835 kB	835 kB	✓

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Commit: fb266ab

[ijjk]

Tests Passed

The base branch was changed.