fix(middleware): clear nextUrl.basePath for absolute paths outside basePath (part of #1830)#1872
fix(middleware): clear nextUrl.basePath for absolute paths outside basePath (part of #1830)#1872james-elicx wants to merge 3 commits into
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/bigbonk review — fix(middleware): clear nextUrl.basePath for absolute paths outside basePath
The core idea is correct and matches Next.js: getNextPathnameInfo only sets basePath when pathHasPrefix(pathname, basePath) (get-next-pathname-info.ts), and NextURL.analyze() does this.basePath = info.basePath ?? '' (next-url.ts). So clearing _basePath to "" when the pathname is outside basePath is the right semantics.
But the change has two blocking problems. The premise note ("Recovered from a cut-off worker; CI + bonk to verify") is accurate — CI is red and there's an App Router parity gap.
🔴 1. Breaks 10 existing unit tests in tests/shims.test.ts (CI red)
The PR updated the tests at lines 8178–8228 but left other tests that encode the old behavior untouched. Running vp test run tests/shims.test.ts -t "basePath" gives 10 failed / 39 passed:
- L8315
href includes basePath prefix— expectshttp://localhost/app/dashboard, gets/dashboard - L8324
href includes both basePath and locale prefix - L8372
basePath setter to empty string clears basePath— expects/app, gets"" - L8440
searchParams mutations ... with basePath and locale - L8453
clone() preserves locale, basePath, and config - L8469
NextRequest passes basePath and i18n config through to nextUrl—new NextRequest("http://localhost/fr/dashboard", { nextConfig: { basePath: "/app", i18n } })now yieldsnextUrl.basePath === ""instead of"/app" - L8487 / L8500 / L8542
NextRequest.url ... - L8615
applies trailingSlash with basePath
These tests all construct a NextURL/NextRequest with a basePath-stripped URL plus basePath: "/app" and expect basePath === "/app". They must be updated to use prefixed input URLs (e.g. http://localhost/app/fr/dashboard) to match the new (correct) semantics — exactly what the PR already did for the few tests it touched.
🔴 2. App Router regression — nextUrl.basePath is now wrong for in-basePath requests
This is the more serious issue. In Next.js, the middleware adapter builds the NextRequest from the original, un-stripped URL (adapter.ts: new NextURL(params.request.url, ...) where params.request.url still carries the basePath). The PR correctly compensates for this on the Pages side by re-adding the prefix in the runMiddleware closures (prod-server.ts:1676, deploy.ts:655).
But App Router was not given the same treatment. applyAppMiddleware passes normalizedPathname: cleanPathname (already basePath-stripped) into executeMiddleware (app-middleware.ts:243). createNextRequest then rebuilds mwUrl.pathname = cleanPathname (stripped) and constructs the NextRequest with nextConfig.basePath: "/app" (middleware-runtime.ts:201-218). With the new _stripBasePath, hasBasePath("/dashboard", "/app") is false, so:
- Before: App Router middleware saw
request.nextUrl.basePath === "/app"for/app/dashboard - After: it sees
request.nextUrl.basePath === ""
This diverges from Next.js for the normal in-basePath case. It's exactly the failing L8469 test in miniature (stripped URL + basePath config). The fix needs to ensure App Router feeds the un-stripped pathname into createNextRequest (mirroring the Pages closures), or pass the basePath through so the NextRequest URL carries the prefix.
Note: there's no e2e test covering App Router middleware + basePath, so without a new test this regression would ship silently. Please add one (port from Next.js
middleware-base-path).
🟡 Minor
prod-server.ts:1682/deploy.ts:661— the re-add logicmwUrl.pathname = basePath + (mwUrl.pathname === "/" ? "" : mwUrl.pathname)duplicatesaddBasePathToPathnamefromutils/base-path.ts. Prefer reusing that helper for consistency and to avoid a second copy of the root-path edge case.middleware-runtime.ts:241-243—matchPathnamere-stripsnormalizedPathname. For App Router (cleanPathnamealready stripped) this is a no-op unless a real route legitimately starts with the basePath string after stripping; acceptable but worth a comment that it relies oncleanPathnamealready being canonical.
Verification
vp test run tests/shims.test.ts -t "basePath"
# Test Files 1 failed (1)
# Tests 10 failed | 39 passed | 993 skipped
Verdict: correct direction, but not mergeable as-is — fix the 10 broken unit tests (use prefixed URLs) and close the App Router nextUrl.basePath gap with a corresponding test.
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Review posted to PR #1872. SummaryThe PR's core change to But I found two blocking issues:
Plus two minor notes (duplicated Verdict: right direction, not mergeable as-is. |
…ession Address two blocking issues from ask-bonk review on #1872: 1. Update 10 unit tests in tests/shims.test.ts that used basePath-stripped URLs (e.g. http://localhost/dashboard with basePath="/app") — these tests encoded the old incorrect behavior where basePath was always set from config regardless of the URL. Switch them to prefixed input URLs (http://localhost/app/dashboard) to match the new correct semantics. 2. Fix App Router regression: createNextRequest in middleware-runtime.ts was receiving normalizedPathname already stripped of basePath (App Router passes cleanPathname), so the NextRequest URL had no basePath prefix and _stripBasePath incorrectly cleared basePath to "". Fix by applying addBasePathToPathname before constructing the URL, mirroring the un-stripped URL that Next.js's adapter always passes to middleware. Also use addBasePathToPathname helper in prod-server.ts and deploy.ts closures instead of duplicating the root-path edge-case logic.
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/bigbonk review — fix(middleware): clear nextUrl.basePath for absolute paths outside basePath
Re-reviewed at 98bc211. The two blockers from my previous review are now resolved, but the second commit introduced a new CI-red regression. Verdict: still not mergeable as-is, but much closer.
✅ Resolved since last review
tests/shims.test.tsbasePath tests are green. The PR updated the remaining tests to use basePath-prefixed input URLs. Verified:vp test run tests/shims.test.ts -t "basePath" # Tests 49 passed | 993 skipped- App Router
nextUrl.basePathregression is fixed.createNextRequestnow re-adds the basePath before constructing theNextRequest(middleware-runtime.ts:208-215):So App Router (which passes the strippedconst mwPathname = basePath ? addBasePathToPathname(normalizedPathname, basePath) : normalizedPathname;
cleanPathname) now feeds an un-stripped pathname intoNextRequest, andNextURLstrips it back →nextUrl.basePath === "/app"for in-basePath requests. This also resolves my earlier minor note about duplicated re-add logic — both Pages closures and App Router now route throughaddBasePathToPathname. The double-add in the Pages flow (closure re-adds, thencreateNextRequestre-adds) is safe becauseaddBasePathToPathnameis idempotent (base-path.ts:32short-circuits whenhasBasePathis true).
🔴 1. New regression — 9 tests fail in tests/deploy.test.ts (CI red)
The deploy.ts change wrapped runMiddleware in a closure and added addBasePathToPathname to the import, but the generated-entry assertions in tests/deploy.test.ts were not updated. Verified:
vp test run tests/deploy.test.ts
# Tests 9 failed | 236 passed (245)
Failing tests:
handles middleware access control responseshandles middleware redirectshandles middleware rewritespreserves responseHeaders on middleware redirectproxies external middleware rewrites before local route handlingruns middleware before routingpreserves x-middleware-request-* headers for prod request override handlingbuilds reqCtx before middleware runshandles basePath stripping and creates a new request with stripped URL for middleware
Two assertion shapes broke:
- 8 sites at
tests/deploy.test.ts:757,775,785,795,807,817,1126,1163assert the literal'runMiddleware: typeof runMiddleware === "function" ? runMiddleware : null', which no longer appears (it's now a closure). - 1 site at
tests/deploy.test.ts:853asserts'import { hasBasePath, stripBasePath } from "vinext/utils/base-path"', but the import is now{ addBasePathToPathname, hasBasePath, stripBasePath }.
These assertions need to be updated to match the new generated output (the closure body and the wider import).
🔴 2. No test covers the App Router nextUrl.basePath fix
The App Router regression fix (item ✅2 above) is the core behavioral change of this commit, but nothing tests it. tests/app-router-middleware-next-request.test.ts and tests/app-post-middleware-context.test.ts have zero basePath coverage, and there's no e2e middleware-base-path fixture. Without a test, this fix can silently regress again. Please add a unit test asserting that App Router middleware sees request.nextUrl.basePath === "/app" for an in-basePath request and === "" for an absolute (out-of-basePath) path — ideally ported from Next.js test/e2e/middleware-base-path.
🟢 Verified correct
NextURL._stripBasePath()clearing_basePathto""whenhasBasePathis false matches Next.jsgetNextPathnameInfo(basePath only set when the pathname starts with the prefix).fetchEventpage change fromnormalizedPathname→matchPathname(middleware-runtime.ts:273) is correct:NextFetchEvent.sourcePageshould be the basePath-stripped matched page.- The matcher re-strip (
matchPathname,middleware-runtime.ts:251-253) correctly handles both flows: App Router's already-strippedcleanPathname(no-op) and the Pages flow's prefixed URL (strips before matching). - The rewrite-target strip (
middleware-runtime.ts:399-409) is safe and idempotent for both flows. vp checkpasses on all four changed source files.
Verdict: Direction is correct and both prior blockers are fixed. To merge: (1) update the 9 tests/deploy.test.ts assertions to match the new generated worker entry, and (2) add a test covering the App Router nextUrl.basePath behavior.
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Review posted to PR #1872. SummaryRe-reviewed at commit ✅ Resolved:
🔴 Two remaining blockers:
Everything else verified correct ( |
…r change
Update 9 tests in deploy.test.ts that checked for the old simple runMiddleware
passthrough ('runMiddleware: typeof runMiddleware === "function" ? runMiddleware : null')
which no longer matches the generated code after the basePath re-add wrapper was
introduced in the deploy adapter.
Fix 1 test in app-route-handler-runtime.test.ts that incorrectly expected NextURL
to re-add the basePath prefix to a URL that was already stripped of it. Per
getNextPathnameInfo semantics (the fix this PR implements for #1830), basePath is
only set when the pathname actually starts with the configured prefix — a stripped
URL stays stripped.
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/bigbonk review — fix(middleware): clear nextUrl.basePath for absolute paths outside basePath
Re-reviewed at be242b4. The new commit (test(middleware): fix stale test assertions broken by basePath wrapper change) fixed 8 of the 9 deploy-test failures from the last review, and the App Router regression remains correctly fixed. But CI is still red — one assertion was missed.
🔴 1. One remaining CI-red failure in tests/deploy.test.ts
The previous commit updated the 8 runMiddleware literal assertions, but missed the import assertion at tests/deploy.test.ts:845. The deploy.ts import was widened to include addBasePathToPathname, so the generated worker entry now emits:
import { addBasePathToPathname, hasBasePath, stripBasePath } from "vinext/utils/base-path";but the test still asserts the old two-symbol import:
expect(content).toContain(
'import { hasBasePath, stripBasePath } from "vinext/utils/base-path"',
);Verified locally:
vp test run tests/deploy.test.ts
# Tests 1 failed | 244 passed (245)
# ❯ tests/deploy.test.ts:844:21
# "handles basePath stripping and creates a new request with stripped URL for middleware"
Fix: update line 845 to assert 'import { addBasePathToPathname, hasBasePath, stripBasePath } from "vinext/utils/base-path"' (or split into separate toContain("addBasePathToPathname") / toContain("stripBasePath") checks).
🔴 2. Still no test covers the App Router nextUrl.basePath fix
The core behavioral change of this PR — createNextRequest re-adding the basePath via addBasePathToPathname(normalizedPathname, basePath) (middleware-runtime.ts:208-210) so App Router middleware sees nextUrl.basePath === "/app" for in-basePath requests — still has zero coverage. tests/middleware-runtime.test.ts has no basePath assertions, and there's no executeMiddleware test exercising the stripped-normalizedPathname + basePath path.
tests/app-route-handler-runtime.test.ts was updated, but it only covers the NextURL out-of-basePath (stripped) case, not the App Router middleware in-basePath re-add. Please add a unit test asserting that executeMiddleware/createNextRequest with normalizedPathname: "/dashboard" + basePath: "/app" yields a NextRequest whose nextUrl.basePath === "/app" (ideally ported from Next.js test/e2e/middleware-base-path). Without it, the App Router fix can silently regress.
🟢 Verified correct
NextURL._stripBasePath()(shims/server.ts:340-347) clearing_basePathto""whenhasBasePathis false matches Next.jsgetNextPathnameInfosemantics. ✓- App Router fix is sound.
app-rsc-handler.ts:413-419documents that App Router only reaches middleware when the request is in-basePath (already stripped) or basePath is empty —hadBasePathis hardcodedtrue. SocreateNextRequestunconditionally re-adding the prefix is correct for every case App Router currently supports (basePath: false/ absolute-path requests are an unrelated known follow-up to #1333). ✓ - Pages flow parity. Both
prod-server.ts:1670-1687anddeploy.ts:655-666wraprunMiddlewarein a closure that re-adds the prefix only whenhadBasePath && basePath, correctly leaving out-of-basePath absolute requests stripped so middleware seesnextUrl.basePath === "". ✓ - Idempotent double-add.
addBasePathToPathnameshort-circuits whenhasBasePathis already true (base-path.ts:32), so the Pages closure re-add +createNextRequestre-add is safe. ✓ - Matcher re-strip (
middleware-runtime.ts:251-253) correctly handles both flows. ✓ vp checkclean on all 4 changed source files. ✓tests/shims.test.ts -t "basePath"→ 49 passed. ✓
Verdict: Direction is correct and the logic is sound, but not mergeable as-is — CI is red. To merge: (1) fix the missed import assertion at tests/deploy.test.ts:845, and (2) add a test for the App Router nextUrl.basePath re-add behavior.
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Review posted to PR #1872. SummaryRe-reviewed at commit 🔴 Two blockers
🟢 Verified correct
Verdict: Logic is correct, but not mergeable as-is — fix the missed import assertion and add App Router coverage. |
1 participant
Part of #1830.
Failing test:
test/e2e/middleware-base-path/test/index.test.ts— "Middleware base tests > should execute from absolute paths".Mirrors Next.js
getNextPathnameInfo:NextURLonly treats basePath as active when the pathname actually starts with the configured prefix, so middleware receiving a request without the basePath prefix seesnextUrl.basePath === ""and can redirect it into the basePath. Strips basePath before matcher evaluation and from rewrite targets; passes the original (un-stripped) URL to middleware from both prod-server and deploy adapters. Includestests/shims.test.tscoverage.Recovered from a cut-off worker; CI + bonk to verify.