Fix i18n fallback rewrite returning 500 instead of 404 for missing prerendered rest-param routes by astro-factory[bot] · Pull Request #17799 · withastro/astro

astro-factory · 2026-08-22T18:16:06Z

Summary

When i18n.routing.fallbackType: "rewrite" is configured and a locale-prefixed URL hits a 404 (e.g. a slug excluded from getStaticPaths() in all locales), the i18n fallback logic rewrites to the default locale's URL. In server mode, prerendered route components are not bundled into the server entry (pageMap only contains SSR routes), so getModuleForRoute was throwing "Unexpectedly unable to find a component instance" — producing a 500 instead of the expected 404.

Fix

Wraps the state.rewrite() call in the case 'rewrite': branch of finalizeI18n (packages/astro/src/core/i18n/handler.ts) with a try/catch. When the rewrite target has no renderable page (i.e. the slug also doesn't exist in the fallback locale), the catch breaks out of the switch and returns the original 404 response. This matches the existing behavior of fallbackType: "redirect" mode.

Confirmation

Reporter @vdaluz confirmed the fix works on their minimal reproduction repo.

Closes #17778

…prerendered route with no runtime component (#17778)

changeset-bot · 2026-08-22T18:16:13Z

🦋 Changeset detected

Latest commit: c7ba47b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 422 packages

Name	Type
astro	Patch
@e2e/astro-linked-lib	Patch
@e2e/actions-blog	Patch
@e2e/actions-react-19	Patch
@e2e/astro-component	Patch
@e2e/astro-envs	Patch
@e2e/astro-island-hydration-error	Patch
@test/astro-cloudflare-node-prerender-mdx	Patch
@test/astro-cloudflare	Patch
@e2e/content-collections	Patch
@e2e/csp-server-islands	Patch
@e2e/css	Patch
@test/custom-client-directives	Patch
@e2e/dev-toolbar	Patch
@e2e/error-cyclic	Patch
@e2e/error-sass	Patch
@e2e/errors	Patch
@e2e/hydration-race	Patch
@e2e/i18n	Patch
@test/nested-style-bug-e22e	Patch
@e2e/preact-compat-component	Patch
@e2e/preact-component	Patch
@e2e/preact-lazy-component	Patch
@e2e/prefetch	Patch
@e2e/react-component	Patch
@e2e/server-islands-key	Patch
@e2e/server-islands	Patch
@e2e/solid-circular	Patch
@e2e/solid-component	Patch
@e2e/solid-recurse	Patch
@e2e/svelte-component	Patch
@e2e/e2e-tailwindcss	Patch
@e2e/ts-resolution	Patch
@e2e/view-transitions	Patch
@e2e/vue-component	Patch
@performance/md	Patch
@performance/mdoc	Patch
@performance/mdx	Patch
@test/0-css	Patch
fake-astro-library	Patch
@test/actions	Patch
@test/alias-css-url-data-uri	Patch
@test/alias-css-url	Patch
@test/alias-path-alias-style	Patch
@test/ts-paths-no-baseurl	Patch
@test/aliases-tsconfig	Patch
@test/aliases	Patch
@test/api-routes	Patch
@test/asset-query-params-chunks	Patch
@test/asset-url-base	Patch
@test/astro-pages	Patch
@test/astro-assets-prefix	Patch
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@test/astro-basic	Patch
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@test/astro-check-no-errors	Patch
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@test/astro-dynamic	Patch
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@test/astro-env-required-public	Patch
@test/astro-env-server-fail	Patch
@test/astro-env-server-secret	Patch
@test/astro-env	Patch
@test/astro-envs	Patch
@test/astro-expr	Patch
@test/astro-get-static-paths	Patch
@test/astro-head	Patch
@test/astro-manifest-client-script	Patch
@test/astro-manifest-invalid	Patch
@test/astro-manifest	Patch
@test/astro-markdown-frontmatter-injection	Patch
@test/astro-markdown-plugins	Patch
@test/astro-markdown-remarkRehype	Patch
@test/astro-markdown-skiki-default-color	Patch
@test/astro-markdown-skiki-langs	Patch
@test/astro-markdown-skiki-themes-custom	Patch
@test/astro-markdown-skiki-themes-integrated	Patch
@test/astro-markdown-skiki-wrap-false	Patch
@test/astro-markdown-skiki-wrap-null	Patch
@test/astro-markdown-skiki-wrap-true	Patch
@test/astro-markdown-url	Patch
@test/astro-markdown	Patch
@test/astro-mode	Patch
@test/astro-page-directory-url	Patch
@test/astro-partial-html	Patch
@test/astro-preview-allowed-hosts	Patch
@test/astro-preview-headers	Patch
@test/astro-public	Patch
@test/astro-script-template-dedup	Patch
@test/astro-scripts	Patch
@test/astro-slots-nested	Patch
@test/concurrency	Patch
@test/build-readonly-file	Patch
@test/cache-memory-query-include	Patch
@test/cache-memory-query	Patch
@test/client-address-node	Patch
@test/client-only-child-styles	Patch
@test/client-only-css-chunk-leak	Patch
@test/code-component	Patch
@test/component-library	Patch
@test/config-vite-css-target-no-minify	Patch
@test/config-vite-css-target	Patch
@test/config-vite	Patch
@test/react-container	Patch
@test/content-with-spaces-in-folder-name	Patch
@test/content-collection-picture-render	Patch
@example/content-collection-references	Patch
@test/content-collection-tla-svg	Patch
@test/content-collections-base	Patch
@test/content-collections-empty-dir	Patch
@test/content-collections-empty-md-file	Patch
@test/content-collections-image-hmr	Patch
@test/content-collections-mutation	Patch
@test/content-collections-number-id	Patch
@test/content-collections-type-inference	Patch
@test/content-collections-with-config-mjs	Patch
@test/content-collections	Patch
@test/content-frontmatter	Patch
@test/content-intellisense	Patch
@test/content-layer-loader-schema-function	Patch
@test/content-layer-remark-plugins	Patch
@test/content-layer	Patch
@test/content-ssr-integration	Patch
@test/content-static-paths-integration	Patch
@test/content	Patch
@test/core-image-data-url	Patch
@test/core-image-deletion-ssr	Patch
@test/core-image-deletion	Patch
@test/core-image-errors	Patch
@test/core-image-fs-config	Patch
@test/core-image-remark-infersize	Patch
@test/core-image-layout	Patch
@test/core-image-picture-emit-file	Patch
@test/core-image-remark-imgattr	Patch
@test/core-image-ssg	Patch
@test/core-image-ssr	Patch
@test/core-image-svg-in-client	Patch
@test/core-image-svg	Patch
@test/core-image-unconventional-settings	Patch
@test/core-image	Patch
@test/csp-adapter	Patch
@test/csp-fonts	Patch
@test/csp	Patch
@test/css-assets	Patch
@test/css-dangling-references	Patch
@test/css-deduplication	Patch
@test/css-double-bundle	Patch
@test/css-dynamic-import-dev	Patch
@test/css-import-as-inline	Patch
@test/css-inline-stylesheets	Patch
@test/css-no-code-split	Patch
@test/css-path-case	Patch
@test/css-pure-chunk-query-params	Patch
@test/css-server-output-dedup	Patch
@test/custom-404-injected-from-dep	Patch
@test/custom-404-pkg	Patch
custom-fetch-error-pages	Patch
@test/custom-renderer	Patch
@test/data-collections-schema	Patch
@test/data-collections	Patch
@test/debug-component	Patch
@test/dev-container	Patch
@test/dev-render	Patch
@test/dev-request-url	Patch
@test/dynamic-endpoint-collision	Patch
@test/dynamic-route-build-file	Patch
@test/endpoint-routing	Patch
@test/error-bad-js	Patch
@test/error-build-location	Patch
@test/error-non-error	Patch
@test/extension-matching	Patch
@test/fetch	Patch
@test/fonts	Patch
@test/astro-fontsource-package	Patch
@test/get-static-paths-pages	Patch
@test/glob-pages-css	Patch
@test/head-propagation-prerender-env	Patch
@test/hmr-markdown	Patch
@test/hmr-middleware	Patch
@test/hmr-new-page	Patch
@test/hmr-slots-render	Patch
@test/hoisted-imports	Patch
@test/html-component	Patch
@test/html-escape	Patch
@test/html-page	Patch
@test/html-slots	Patch
@test/hydration-race	Patch
@test/i18n-client-import	Patch
@test/i18n-css-leak-basic	Patch
@test/import-ts-with-js	Patch
@test/impostor-md-file	Patch
@test/incremental-build-client-only	Patch
@test/incremental-build-concurrency	Patch
@test/incremental-build-content	Patch
@test/incremental-build-drop-key	Patch
@test/incremental-build-dynamic-import	Patch
@test/incremental-build-fonts	Patch
@test/incremental-build-headers	Patch
@test/incremental-build-images	Patch
@test/incremental-build-islands	Patch
@test/incremental-build-no-output	Patch
@test/incremental-build-script	Patch
@test/incremental-build	Patch
@test/integration-add-page-extension	Patch
@test/integration-server-setup	Patch
@test/jsx-queue-rendering	Patch
@test/large-array-solid	Patch
@test/legacy-collections-backwards-compat	Patch
@test/lightningcss-css-modules-content	Patch
@test/lightningcss-scoped-nesting	Patch
@test/live-loaders	Patch
@test/markdown	Patch
@test/middleware-dev	Patch
@test/middleware-full-ssr	Patch
@test/middleware-no-user-middlewaqre	Patch
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@test/minification-html	Patch
@test/non-ascii-path	Patch
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@test/page-format	Patch
@test/page-level-styles	Patch
@test/parallel-components	Patch
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@test/postcss	Patch
@test/preact-compat-component	Patch
@test/preact-component	Patch
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@test/request-signal	Patch
@test/reuse-injected-entrypoint	Patch
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@test/alpinejs-basics	Patch
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@test/alpinejs-plugin-script-import	Patch
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@test/astro-cloudflare-external-image-service	Patch
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@test/astro-cloudflare-prerenderer-errors	Patch
@test/astro-cloudflare-prerenderer-render-error	Patch
@test/routing-priority-cloudflare	Patch
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@test/netlify-hosted-astro-project	Patch
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@test/locals	Patch
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@test/nodejs-prerender-404-500	Patch
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@test/node-sessions	Patch
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@test/sitemap-dynamic	Patch
@test/sitemap-i18n-fallback	Patch
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async-rendering	Patch
conditional-rendering	Patch
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svelte-prop-types	Patch
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@test/astro-vercel-redirects-serverless	Patch
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@test/vercel-server-islands	Patch
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@test/astro-vercel-with-web-analytics-enabled-output-as-static	Patch
vercel-hosted-astro-project	Patch
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vue-prop-types	Patch
astro-benchmark	Patch
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codspeed · 2026-08-22T18:23:06Z

Merging this PR will not alter performance

✅ 21 untouched benchmarks

_{Comparing factory/fix-17778 (c7ba47b) with main (6661fbe)¹}

No successful run was found on main (99d3d3d) during the generation of this report, so 6661fbe was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [astro](https://astro.build) ([source](https://github.com/withastro/astro/tree/HEAD/packages/astro)) | [`7.2.4` → `7.2.6`](https://renovatebot.com/diffs/npm/astro/7.2.4/7.2.6) | ![age](https://developer.mend.io/api/mc/badges/age/npm/astro/7.2.6?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/astro/7.2.4/7.2.6?slim=true) | --- > ⚠️ **Warning** > > Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/273) for more information. --- ### Release Notes <details> <summary>withastro/astro (astro)</summary> ### [`v7.2.6`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#726) [Compare Source](https://github.com/withastro/astro/compare/astro@7.2.5...astro@7.2.6) ##### Patch Changes - [#17812](withastro/astro#17812) [`29af6da`](withastro/astro@29af6da) Thanks [@matthewp](https://github.com/matthewp)! - Fixes a bug where `new FetchState(request)` could fail in development when server dependencies were optimized ### [`v7.2.5`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#725) [Compare Source](https://github.com/withastro/astro/compare/astro@7.2.4...astro@7.2.5) ##### Patch Changes - [#17758](withastro/astro#17758) [`5f419e2`](withastro/astro@5f419e2) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes a bug where `experimental_getFontFileURL()` rejected valid font URLs when using the Cloudflare adapter - [#17416](withastro/astro#17416) [`493796b`](withastro/astro@493796b) Thanks [@iseraph-dev](https://github.com/iseraph-dev)! - Skips no-op pathname writes when normalizing SSR request URLs - [#17712](withastro/astro#17712) [`bd374b7`](withastro/astro@bd374b7) Thanks [@fkatsuhiro](https://github.com/fkatsuhiro)! - Updates deprecation messages target from Astro 7 to 8 - [#17719](withastro/astro#17719) [`dac1768`](withastro/astro@dac1768) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes session ID validation to reject non-UUID cookie values before using them as storage keys - [#17770](withastro/astro#17770) [`84eb7e7`](withastro/astro@84eb7e7) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes `--mode`, `--site`, `--base`, `--out-dir`, `--verbose`, `--silent`, and `--open` flags being silently dropped when using `astro dev --background` or `astro preview --background` - [#17713](withastro/astro#17713) [`d035290`](withastro/astro@d035290) Thanks [@wakqasahmed](https://github.com/wakqasahmed)! - Fixes `content-modules.mjs` not removing entries for deleted or renamed content files, which could cause Vite to attempt to resolve non-existent modules As part of this fix, `#moduleImports` is now fully rebuilt from `deferredRender` entries before every write, so a module import added only through the public `addModuleImport()` API without a corresponding `deferredRender` entry in the store will no longer be preserved across writes. - [#17743](withastro/astro#17743) [`adc750f`](withastro/astro@adc750f) Thanks [@contactjawad](https://github.com/contactjawad)! - Fixes `Astro.preferredLocale` and `Astro.preferredLocaleList` ignoring `Accept-Language` quality values when they are absent or `0`. An entry without an explicit `q=` now correctly counts as quality `1.0` (per RFC 7231) and an entry with `q=0` is treated as not acceptable, so the highest-quality locale is selected regardless of header order. - [#17757](withastro/astro#17757) [`660991c`](withastro/astro@660991c) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes build errors showing wrong file location, missing line:col, and misleading hints when a plugin error (e.g. from MDX) is wrapped by Vite's build error - [#17783](withastro/astro#17783) [`60b14ff`](withastro/astro@60b14ff) Thanks [@matthewp](https://github.com/matthewp)! - Fixes a type error when passing an image from a content collection `image()` schema to a component or `<Image />`. The schema returned by `image()` was missing the `apng` format, so it no longer matched the type of an imported image. - [#17664](withastro/astro#17664) [`d483125`](withastro/astro@d483125) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes an issue where Astro CSP support didn't correctly handle cases `"unsafe-inline"` resource. Now when `"unsafe-inline"`, Astro won't emit hashes for the directive specified. - [#17810](withastro/astro#17810) [`0fc5f65`](withastro/astro@0fc5f65) Thanks [@florian-lefebvre](https://github.com/florian-lefebvre)! - Fixes a regression in the content collections that could cause images to not be resolved - [#17781](withastro/astro#17781) [`aa33b44`](withastro/astro@aa33b44) Thanks [@matthewp](https://github.com/matthewp)! - Fixes `memoryCache()` storing responses that set cookies through `Astro.cookies` or `Astro.session` - [#17787](withastro/astro#17787) [`6661fbe`](withastro/astro@6661fbe) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes `server:defer` crashing the dev server with "undefined is not a function" when a deferred component imports from `astro:i18n` - [#17750](withastro/astro#17750) [`dd0e3ac`](withastro/astro@dd0e3ac) Thanks [@dobrodob](https://github.com/dobrodob)! - Fixes a regression where `transition:persist` stopped working for `<audio>` and `<video>` elements. - [#17774](withastro/astro#17774) [`fe1d16d`](withastro/astro@fe1d16d) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Adds support for importing `.apng` files as image metadata for use with standard `<img>` elements. Astro's image components reject APNG files to avoid removing their animation - [#17799](withastro/astro#17799) [`8797754`](withastro/astro@8797754) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes i18n `fallbackType: "rewrite"` returning 500 instead of 404 when the fallback locale also has no matching static path for a prerendered dynamic route - [#17741](withastro/astro#17741) [`99d3d3d`](withastro/astro@99d3d3d) Thanks [@ericswpark](https://github.com/ericswpark)! - Bumps the Astro compiler to the latest version. [Changelog](https://github.com/withastro/compiler-rs/releases/tag/%40astrojs%2Fcompiler-rs%400.4.0). - [#17782](withastro/astro#17782) [`3578d45`](withastro/astro@3578d45) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Improves the performance of the Astro CLI in local by enabling Node's module compilation cache. - [#17705](withastro/astro#17705) [`2043e4f`](withastro/astro@2043e4f) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes incremental builds serving cached HTML that references stale CSS filenames after a stylesheet-only edit - [#17754](withastro/astro#17754) [`3d50dfd`](withastro/astro@3d50dfd) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes the dev server refusing to start in Docker containers after a restart due to PID reuse in the lock file check - [#17769](withastro/astro#17769) [`bbda94d`](withastro/astro@bbda94d) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes a build failure when defining `vite.environments.ssr` in the Astro config. User-provided environment config for `ssr`, `prerender`, or `client` is now properly deep-merged with Astro's internal environment settings instead of silently breaking the server entry naming. - [#17776](withastro/astro#17776) [`0874da8`](withastro/astro@0874da8) Thanks [@astro-factory](https://github.com/apps/astro-factory)! - Fixes the `glob()` content loader failing to load files with colons in their names (e.g., `Guide: Architecture.md`) - Updated dependencies \[[`0762a83`](withastro/astro@0762a83), [`0c99615`](withastro/astro@0c99615)]: - [@astrojs/markdown-satteri](https://github.com/astrojs/markdown-satteri)@0.3.8 </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).  Co-authored-by: Davide Zarantonello <davide@zarantonello.dev>

fix(i18n): return 404 instead of 500 when fallback rewrite targets a …

c7ba47b

…prerendered route with no runtime component (#17778)

astro-factory Bot added the fix verified Reporter confirmed the triage bot fix works label Aug 22, 2026

astro-factory Bot mentioned this pull request Aug 22, 2026

i18n fallback 'rewrite' throws 500 instead of 404 when fallback target ALSO has no static path (rest-param routes) #17778

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github-actions Bot added the pkg: astro Related to the core `astro` package (scope) label Aug 22, 2026

ematipico approved these changes Aug 23, 2026

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ematipico merged commit 8797754 into main Aug 23, 2026
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ematipico deleted the factory/fix-17778 branch August 23, 2026 10:12

astrobot-houston mentioned this pull request Aug 22, 2026

[ci] release #17753

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AbhiPra24 mentioned this pull request Aug 23, 2026

fix(i18n): return 404 instead of 500 when fallback rewrite target does not exist #17784

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manuelgruber mentioned this pull request Sep 21, 2026

context.rewrite() resolves to the wrong dynamic route in astro dev when two route patterns match the path #18089

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Fix i18n fallback rewrite returning 500 instead of 404 for missing prerendered rest-param routes - #17799

Fix i18n fallback rewrite returning 500 instead of 404 for missing prerendered rest-param routes#17799
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astro-factory Bot commented Aug 22, 2026

Summary

Fix

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changeset-bot Bot commented Aug 22, 2026

🦋 Changeset detected

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codspeed Bot commented Aug 22, 2026

Merging this PR will not alter performance

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