Prerender cause 404 on refresh if the route params contains non-latin character

[songkeys]

Describe the bug

When route param contains non-latin characters and prerender is enabled for these routes, you'll encounter 404 when hard refresh on these pages. Probably because the output are actually original character but when matching the path, it's encoded url.

Reproduction

https://github.com/songkeys/sveltekit-prerender-non-latin-route-params-repro

Logs

when visiting `/中文/`, server outputs:


SvelteKitError: Not found: /%E4%B8%AD%E6%96%87/
    at resolve2 (file:///Users/songkeys/Documents/GitHub/Songkeys/sveltekit-prerender-non-latin-route-params-repro/.svelte-kit/output/server/index.js:3714:18)
    at resolve (file:///Users/songkeys/Documents/GitHub/Songkeys/sveltekit-prerender-non-latin-route-params-repro/.svelte-kit/output/server/index.js:3547:34)
    at #options.hooks.handle (file:///Users/songkeys/Documents/GitHub/Songkeys/sveltekit-prerender-non-latin-route-params-repro/.svelte-kit/output/server/index.js:3792:71)
    at respond (file:///Users/songkeys/Documents/GitHub/Songkeys/sveltekit-prerender-non-latin-route-params-repro/.svelte-kit/output/server/index.js:3545:43)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  status: 404,
  text: 'Not Found'
}

### System Info

```Shell
System:
    OS: macOS 15.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 166.66 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.3.0 - ~/.local/state/fnm_multishells/88126_1729661413490/bin/node
    npm: 10.8.1 - ~/.local/state/fnm_multishells/88126_1729661413490/bin/npm
    pnpm: 9.12.2 - ~/.local/state/fnm_multishells/88126_1729661413490/bin/pnpm
    bun: 1.1.27 - ~/.bun/bin/bun
  Browsers:
    Chrome: 130.0.6723.59
    Safari: 18.1
  npmPackages:
    @sveltejs/adapter-auto: 3.3.0 => 3.3.0 
    @sveltejs/adapter-static: 3.0.5 => 3.0.5 
    @sveltejs/kit: 2.7.2 => 2.7.2 
    @sveltejs/vite-plugin-svelte: 4.0.0 => 4.0.0 
    svelte: 5.0.5 => 5.0.5 
    vite: 5.4.10 => 5.4.10

Severity

serious, but I can work around it

Additional Information

I can made a PR to output the encoded path as folder/filename. Or do you think there is a better way to solve this?

[teemingc]

As a workaround for now, you can run pnpx serve build instead of pnpm preview. The issue is with our Vite preview server not decoding the non-latin characters before looking for prerendered pages.