Thank you for the Unity documentation.
Now you can try Valet again, which I have tried to adapt to Unity's needs.
As mentioned yesterday, the problem for me is unzipping the three files compressed by Unity when creating an HTML5 game in .gz format, starting with framework.js.gz. If it helps, here's the console report:
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VALET - Lightweight Local Webserver
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[CONFIG] Loading configuration from package.json...
[CONFIG] App: valet-app
[CONFIG] Main: index.html
[CONFIG] Title: Valet App
[CONFIG] Window Size: 960x720
[CONFIG] Browser: msedge
[SERVER] Auto-detected port: 8000
[SERVER] Starting HTTP server on http://localhost:8000
[SERVER] Serving files from: D:\UNITY\Valet
[INFO] Waiting for server to start...
[BROWSER] Found browser at: C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
[BROWSER] Launching C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
[BROWSER] Arguments: --app=http://localhost:8000/index.html --app-name=Valet App --window-size=960,720 --window-position=480,160 --disable-extensions --disable-translate --user-data-dir=D:\UNITY\Valet\.valet_data
[BROWSER] Browser launched successfully
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Application Running
Press Ctrl+C or close console to exit
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https://1fichier.com/?qbdeco63m710b1ljy2yk
Here's an example of a simple game not compressed by Unity, which limits the problems. If you manage to run it, I can give you a link to the same game but compressed by Unity and therefore smaller...
https://1fichier.com/?k9m7z59xvkaxbmpxfd12
Here's an example of the same game compressed by Unity (.gz files), which causes problems for local servers. It's unfortunate because the file size is between 30 and 40% smaller, which has a considerable impact on 3D games.