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fix: prefer the default error page when failing to decode the URL pathname#15744

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decode-uri-error-page
May 21, 2026
Merged

fix: prefer the default error page when failing to decode the URL pathname#15744
teemingc merged 5 commits into
mainfrom
decode-uri-error-page

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@teemingc teemingc commented Apr 22, 2026

Previously, if a URL pathname could not be decoded, you'd get a text response. This PR makes it so that it renders the default error page instead which is a lot prettier for users. This only affects built apps because the Vite dev server intercepts malformed URIs


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changeset-bot Bot commented Apr 22, 2026

🦋 Changeset detected

Latest commit: 10d6d84

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

This PR includes changesets to release 1 package
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@sveltejs/kit Patch

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While this works, can we somehow rework this so that it returns a proper thing directly, instead of having to set the path to null and then hundreds of lines of code later return an error response?

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While this works, can we somehow rework this so that it returns a proper thing directly, instead of having to set the path to null and then hundreds of lines of code later return an error response?

Do you mean directly calling respond_with_error when we fail to decode? I tried that but the issue is I don't think we can get the transformPageChunk, filterSerializedResponseHeaders, preload resolve args until the actual resolve call.

@teemingc teemingc requested a review from dummdidumm May 18, 2026 21:34
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teemingc commented May 21, 2026

Need to hold off on this until we rewrite server/respond.js

EDIT: Actually, returning handle early might be good enough

@teemingc teemingc marked this pull request as draft May 21, 2026 16:46
@teemingc teemingc marked this pull request as ready for review May 21, 2026 17:21
return await handle_fatal_error(event, event_state, options, e);
}

async function handle() {
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This function was just moved to an outer closure

@teemingc teemingc merged commit 69b5787 into main May 21, 2026
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@teemingc teemingc deleted the decode-uri-error-page branch May 21, 2026 19:04
This was referenced May 21, 2026
Rich-Harris pushed a commit that referenced this pull request May 22, 2026
This PR was opened by the [Changesets
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be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## @sveltejs/kit@2.61.0

### Minor Changes

- breaking: the `.run()` method has been removed from remote queries on
both the client and the server. Use `await query()` directly instead —
it now works everywhere
([#15779](#15779))


- feat: remote queries can now be awaited in any context (event
handlers, module scope, async callbacks), not just inside reactive
contexts. The cache is shared across reactive and non-reactive
subscribers, so awaiting a query in an event handler will dedupe with
components that have already subscribed to the same query.
([#15779](#15779))


- feat: live query instances are now themselves async-iterable
([#15878](#15878))


- feat: add programmatic `submit` method to `form` remote function
instances ([#15657](#15657))


- feat: pass `form` remote function instance into `enhance` callback
([#15657](#15657))

### Patch Changes

- fix: resolve the app payload without using `process.env.NODE_ENV`
([#15852](#15852))


- fix: support `exactOptionalPropertyTypes` for optional route params
([#15825](#15825))


- fix: correctly send `true` value to the server for 'submit' and
'hidden' form fields
([#15858](#15858))


- fix: avoid build warnings about undefined universal hooks
([#15895](#15895))


- fix: prefer default error page when failing to decode the URL pathname
([#15744](#15744))


- fix: disable link prefetching on slow internet connections
([#15885](#15885))


- fix: allow routes ending with optional parameters next to more
specific routes ([#15861](#15861))


- fix: remove reliance on Content-Length header in
deserialize_binary_form, which caused failures when proxies (e.g.
Vercel, Azure) strip the header and use chunked transfer encoding
([#15796](#15796))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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