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fix: ensure internal x-middleware-set-cookie header is not passed on to lambda #2891

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fix: ensure internal x-middleware-set-cookie header is not passed on to lambda #2891

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8e4d7b6
fix: ensure internal x-middleware-set-cookie header is not set when s…
mrstork May 1, 2025
674ed88
test: skipping middleware draft mode tests
mrstork May 1, 2025
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4 changes: 4 additions & 0 deletions edge-runtime/lib/middleware.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,10 @@ export function mergeMiddlewareCookies(middlewareResponse: Response, lambdaReque
const middlewareCookies = middlewareResponse.headers.get('x-middleware-set-cookie')

if (middlewareCookies) {
// Next expects internal headers to be omitted when cookies are set by the middleware
// See: https://github.com/vercel/next.js/blob/005db43079c7b59fd8c2594e8362761dc4cb3211/test/e2e/app-dir/app-middleware/app-middleware.test.ts#L197-L207
middlewareResponse.headers.delete('x-middleware-set-cookie')
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Does final response reaching client (browser/curl etc) would have actual set-cookie with this removal? from what I can see mergeMiddlewareCookies only sets cookie header:

opennextjs-netlify/edge-runtime/lib/response.ts

Lines 245 to 248 in 7795157

const newRequestCookies = mergeMiddlewareCookies(edgeResponse, newRequest)
if (newRequestCookies) {
newRequest.headers.set('Cookie', newRequestCookies)
}

so I wonder if this change as-is wouldn't result in clients no longer actually receiving set-cookie headers?


// Targets commas that are not followed by whitespace
// See: https://github.com/vercel/next.js/blob/e6145d3a37bb4c7b481fd58e05cdff9046ace8ad/packages/next/src/server/web/spec-extension/response.ts#L58-L66
const regex = new RegExp(/,(?!\s)/)
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9 changes: 9 additions & 0 deletions tests/test-config.json
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Expand Up @@ -377,6 +377,15 @@
"tests": [
"router autoscrolling on navigation bugs Should apply scroll when loading.js is used"
]
},
{
"file": "test/e2e/app-dir/app-middleware/app-middleware.test.ts",
"reason": "Relies on access to environment variables set on the edge",
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See: https://github.com/vercel/next.js/blob/canary/packages/next/src/server/web/get-edge-preview-props.ts

"tests": [
"app-dir with middleware Mutate request headers for Serverless Functions Supports draft mode",
"app-dir with middleware Mutate request headers for Edge Functions Supports draft mode",
"app-dir with middleware Mutate request headers for next/headers Supports draft mode"
]
}
],
"failures": [
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