initialize ALS with cookies in middleware #65008

ztanner · 2024-04-24T22:33:38Z

What

Cookies set/updated/removed in middleware won't be accessible during the render in which they were set

Why

Middleware will properly set a set-cookie header to inform the client of the cookie change, but this means the AsyncLocalStorage context containing the cookies value wouldn't be updated until the next time the request headers were parsed. In other words, on the first request the cookie would be sent but wouldn't be available in the cookies() context. And then the following request would properly have the cookie values.

How

This uses a proxy on the ResponseCookies used in middleware to add a middleware override header with the cookie value. When we instantiate the cached cookies, we merge in whatever headers would have been set by middleware, so that they're available in the same render that invoked middleware.

Test Plan

This changeset adds a test to confirm cookies set/deleted in middleware are available in a single pass. Verified with a deployment here.

Fixes #49442
Closes NEXT-1126

ztanner · 2024-04-24T22:33:58Z

initialize ALS with cookies in middleware #65008 👈
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ijjk · 2024-04-24T22:39:03Z

Tests Passed

ijjk · 2024-04-24T22:42:17Z

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
buildDuration	28.9s	29.4s	⚠️ +514ms
buildDurationCached	18.9s	13.6s	N/A
nodeModulesSize	239 MB	239 MB	⚠️ +45 kB
nextStartRea..uration (ms)	745ms	751ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
2453-HASH.js gzip	31.8 kB	31.8 kB	N/A
3304.HASH.js gzip	169 B	169 B	✓
3f784ff6-HASH.js gzip	53.5 kB	53.5 kB	N/A
8299-HASH.js gzip	5.09 kB	5.09 kB	✓
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	228 B	228 B	✓
main-HASH.js gzip	31.5 kB	31.6 kB	N/A
webpack-HASH.js gzip	1.64 kB	1.65 kB	N/A
Overall change	50.7 kB	50.7 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
_app-HASH.js gzip	193 B	194 B	N/A
_error-HASH.js gzip	193 B	191 B	N/A
amp-HASH.js gzip	510 B	510 B	✓
css-HASH.js gzip	342 B	343 B	N/A
dynamic-HASH.js gzip	2.51 kB	2.52 kB	N/A
edge-ssr-HASH.js gzip	265 B	265 B	✓
head-HASH.js gzip	365 B	364 B	N/A
hooks-HASH.js gzip	389 B	391 B	N/A
image-HASH.js gzip	4.28 kB	4.28 kB	N/A
index-HASH.js gzip	269 B	268 B	N/A
link-HASH.js gzip	2.68 kB	2.69 kB	N/A
routerDirect..HASH.js gzip	328 B	326 B	N/A
script-HASH.js gzip	395 B	397 B	N/A
withRouter-HASH.js gzip	323 B	323 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	1.2 kB	1.2 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
_buildManifest.js gzip	482 B	484 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
index.html gzip	528 B	530 B	N/A
link.html gzip	541 B	541 B	✓
withRouter.html gzip	523 B	523 B	✓
Overall change	1.06 kB	1.06 kB	✓

Edge SSR bundle Size Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
edge-ssr.js gzip	108 kB	108 kB	⚠️ +160 B
page.js gzip	3.05 kB	3.04 kB	N/A
Overall change	108 kB	108 kB	⚠️ +160 B

Middleware size Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
middleware-b..fest.js gzip	621 B	623 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	27.8 kB	27.9 kB	⚠️ +150 B
edge-runtime..pack.js gzip	839 B	839 B	✓
Overall change	28.6 kB	28.8 kB	⚠️ +150 B

Next Runtimes

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
app-page-exp...dev.js gzip	171 kB	171 kB	N/A
app-page-exp..prod.js gzip	98.3 kB	98.4 kB	N/A
app-page-tur..prod.js gzip	99.8 kB	99.9 kB	N/A
app-page-tur..prod.js gzip	94.2 kB	94.2 kB	N/A
app-page.run...dev.js gzip	157 kB	157 kB	N/A
app-page.run..prod.js gzip	92.9 kB	93 kB	N/A
app-route-ex...dev.js gzip	21.4 kB	21.4 kB	N/A
app-route-ex..prod.js gzip	15.1 kB	15.2 kB	N/A
app-route-tu..prod.js gzip	15.1 kB	15.2 kB	N/A
app-route-tu..prod.js gzip	14.9 kB	14.9 kB	N/A
app-route.ru...dev.js gzip	21.2 kB	21.3 kB	N/A
app-route.ru..prod.js gzip	14.9 kB	14.9 kB	N/A
pages-api-tu..prod.js gzip	9.55 kB	9.55 kB	✓
pages-api.ru...dev.js gzip	9.82 kB	9.82 kB	✓
pages-api.ru..prod.js gzip	9.55 kB	9.55 kB	✓
pages-turbo...prod.js gzip	21.4 kB	21.4 kB	✓
pages.runtim...dev.js gzip	22.1 kB	22.1 kB	✓
pages.runtim..prod.js gzip	21.4 kB	21.4 kB	✓
server.runti..prod.js gzip	65.3 kB	65.3 kB	✓
Overall change	159 kB	159 kB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js 04-24-initialize_ALS_with_cookies_in_middleware	Change
0.pack gzip	1.61 MB	1.61 MB	⚠️ +3.7 kB
index.pack gzip	108 kB	108 kB	⚠️ +150 B
Overall change	1.72 MB	1.72 MB	⚠️ +3.85 kB

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Commit: 45392d3

ijjk · 2024-04-25T15:54:10Z

test/e2e/app-dir/app-middleware/middleware.js

+  if (request.nextUrl.pathname === '/rsc-cookies') {
+    const res = NextResponse.next()
+    res.cookies.set('rsc-cookie-value-1', `${Math.random()}`)
+    res.cookies.set('rsc-cookie-value-2', `${Math.random()}`)


Should this also work with cookies() directly (not from res)?

Yeah perhaps -- although writing via cookies() has been documented as only working in server actions/route handlers. So I think making this change could be separate from this while making the canonical middleware use-case work correctly.

test/e2e/app-dir/app-static/app-static.test.ts

ijjk added created-by: Next.js team PRs by the Next.js team. tests type: next labels Apr 24, 2024

ztanner force-pushed the 04-24-initialize_ALS_with_cookies_in_middleware branch 7 times, most recently from 6494081 to 2b59b4a Compare April 25, 2024 00:26

ztanner marked this pull request as ready for review April 25, 2024 13:57

ztanner requested review from timneutkens, ijjk, shuding, huozhi, feedthejim and wyattjoh as code owners April 25, 2024 13:57

ztanner force-pushed the 04-24-initialize_ALS_with_cookies_in_middleware branch 3 times, most recently from e863e11 to fd4a725 Compare April 25, 2024 15:21

ijjk reviewed Apr 25, 2024

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test/e2e/app-dir/app-static/app-static.test.ts Outdated Show resolved Hide resolved

initialize ALS with cookies in middleware

45392d3

ztanner force-pushed the 04-24-initialize_ALS_with_cookies_in_middleware branch from fd4a725 to 45392d3 Compare April 25, 2024 16:08

ztanner requested a review from a team as a code owner April 25, 2024 16:08

ztanner requested a review from ijjk April 25, 2024 16:09

ijjk approved these changes Apr 25, 2024

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ztanner merged commit 433faa8 into canary Apr 25, 2024
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ztanner deleted the 04-24-initialize_ALS_with_cookies_in_middleware branch April 25, 2024 16:47

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initialize ALS with cookies in middleware #65008

initialize ALS with cookies in middleware #65008

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ztanner Apr 25, 2024

initialize ALS with cookies in middleware #65008

initialize ALS with cookies in middleware #65008

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Test Plan

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