Dev and preview are not aligned in how they serve index.html files contained under subfolders of `public`

ElliotNB commented 2 weeks ago

Describe the bug

I have a project with static HTML and CSS assets stored in a subfolder under the public folder (e.g., public/admin-panel/, public/reports/). Each subfolder under the public folder contains an index.html file (e.g., public/admin-panel/index.html and public/reports/index.html).

If I build my application (npm run build -- aka, vite build) and serve up the preview (npm run serve -- aka, vite preview), then the index.html file is served up correctly regardless of whether I access the file via http://localhost:4173/admin-panel/ or http://localhost:4173/admin-panel/index.html

However, if I start up my application using npm run dev (aka, vite), then it does not behave the same. If I visit http://localhost:5173/admin-panel/ then it will instead serve the index.html file contained in the root folder of my project. Only if I visit http://localhost:5173/admin-panel/index.html will it then serve up the correct index.html file.

A similar bug was patched back in October 2023 ( https://github.com/vitejs/vite/pull/14756 ) but it appears to have only been applied to index.html files contained in subfolders under the src folder. Subfolders to the public folder are still impacted.

Reproduction

https://stackblitz.com/edit/vitejs-vite-sepev3?file=main.js

Steps to reproduce

Open the re-pro URL ( https://stackblitz.com/edit/vitejs-vite-sepev3?file=main.js ).
Click on Admin panel link (does not work) and observe that it serves the root index.html.
Click on Admin panel link (does work) and observe that it correctly serves public/admin-panel/index.html -- displaying the "Hello world." mesage.

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (4) x64 Intel(R) Core(TM)2 Quad CPU    Q9650  @ 3.00GHz
    Memory: 6.28 GB / 16.00 GB
  Binaries:
    Node: 21.7.3 - C:\Program Files\nodejs\node.EXE
    npm: 10.5.0 - C:\Program Files\nodejs\npm.CMD
    pnpm: 8.15.6 - ~\AppData\Roaming\npm\pnpm.CMD
  Browsers:
    Edge: Chromium (123.0.2420.97)
    Internet Explorer: 11.0.19041.3636

Used Package Manager

npm

Logs

No response

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