Windows - javascript error (blank web page) after start_ui.bat clean install #49
Description
On windows, after downloading and extracting the zip file and running start_ui.bat
The script installs all requirements and launches the browser at http://localhost:8888 however the page is blank, and the chrome console has the message:
index-v7zMAC7k.js:1 Failed to load module script: Expected a JavaScript-or-Wasm module script but the server responded with a MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec.
I can see that indeed in the network pane, the js file has the following response headers (note content-type incorrect):
HTTP/1.1 200 OK
date: Mon, 12 Jan 2026 09:24:49 GMT
server: uvicorn
content-type: text/plain; charset=utf-8
accept-ranges: bytes
content-length: 656420
last-modified: Mon, 12 Jan 2026 08:48:34 GMT
etag: "3dfb7381a2badd433015d6de3950b93a"
access-control-allow-credentials: true
access-control-allow-origin: http://127.0.0.1:8888
vary: Origin
PS console window running start_ui.bat has the following output (this is not the first run):
PS C:\Projects\autocoder> .\start_ui.bat
====================================
AutoCoder UI
====================================
Installing dependencies...
==================================================
AutoCoder UI Setup
==================================================
[1/6] Setting up Python environment
--------------------------------------------------
Virtual environment already exists
[2/6] Installing Python dependencies
--------------------------------------------------
Installing Python dependencies...
[3/6] Checking Node.js
--------------------------------------------------
Node.js version: v24.11.1
[4/6] Installing npm dependencies
--------------------------------------------------
npm dependencies already installed
[5/6] Building frontend
--------------------------------------------------
Frontend already built
[6/6] Starting server
--------------------------------------------------
Starting server at http://127.0.0.1:8888
==================================================
Server running at http://127.0.0.1:8888
Press Ctrl+C to stop
==================================================
INFO: Started server process [36408]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://127.0.0.1:8888 (Press CTRL+C to quit)
INFO: 127.0.0.1:38460 - "GET / HTTP/1.1" 200 OK
INFO: 127.0.0.1:38460 - "GET /assets/index-v7zMAC7k.js HTTP/1.1" 200 OK
INFO: 127.0.0.1:46284 - "GET /assets/index-LBpMaG9n.css HTTP/1.1" 200 OK
INFO: 127.0.0.1:38460 - "GET /vite.svg HTTP/1.1" 200 OK
INFO: 127.0.0.1:46986 - "GET /assets/index-LBpMaG9n.css HTTP/1.1" 304 Not Modified
INFO: 127.0.0.1:46986 - "GET /.well-known/appspecific/com.chrome.devtools.json HTTP/1.1" 200 OK