Web UI fails in Chrome/Edge with net::ERR_CONNECTION_RESET, Firefox works

The Problem

Describe the bug

After the latest update, I can no longer open the AI-on-the-edge-device web interface in Chrome or Edge. The page fails to load and Chrome/Edge show net::ERR_CONNECTION_RESET in the developer tools.

The same device and web interface still work in Firefox.

The REST/API endpoints are still reachable in Chrome, for example:

/json
/rssi
/sysinfo

So the device itself, Wi-Fi connection and API seem to be working. The problem appears to be limited to serving the Web UI to Chromium-based browsers.

Devices affected

I have 3 AI-on-the-edge-device ESP32 units running. All 3 show the same behavior after the update.

Browser behavior

Chrome / Edge:

• Web UI does not load
• Developer tools show: net::ERR_CONNECTION_RESET
• /json works
• individual static files such as /firework.css can be opened directly

Firefox:

• Web UI loads normally
• Firmware version and Web UI version shown in the UI match

What I tested

Firmware version and Web UI version match in Firefox.

Direct API endpoints work in Chrome:

http://<device-ip>/json
http://<device-ip>/rssi
http://<device-ip>/sysinfo

Directly opening CSS files works in both Chrome and Firefox:

http://<device-ip>/firework.css
http://<device-ip>/firework.css?v=<commit-code>

However, requesting the main page with curl already shows a connection reset:

curl.exe -v http://<device-ip>/index.html -o "$env:TEMP\ai-edge-index.html"

Output excerpt:

* Request completely sent off
< HTTP/1.1 200 OK
< Content-Type: text/html
< Transfer-Encoding: chunked
< Cache-Control: max-age=43200
< Content-Encoding: gzip
<
{ [1384 bytes data]
* Recv failure: Connection was reset
100  1379    0  1379    0     0   8661      0 --:--:-- --:--:-- --:--:--  8672
* closing connection #0

Opening /index.html.gz directly downloads a gzip archive, and the contained index.html appears to be valid.

Current suspicion

The issue seems related to serving the main Web UI document with:

Content-Encoding: gzip
Transfer-Encoding: chunked

The ESP32 appears to send HTTP/1.1 200 OK, starts transferring the gzip-compressed index.html, but then resets the TCP connection. Firefox seems to tolerate this, while Chrome and Edge fail with ERR_CONNECTION_RESET.

Expected behavior

The Web UI should load normally in Chrome and Edge, as it did before the update.

Actual behavior

Chrome and Edge fail to load the Web UI with net::ERR_CONNECTION_RESET, while Firefox still works.

Additional context

Since /json and other API endpoints work in Chrome, the meter reading functionality itself seems unaffected. This appears to be limited to the Web UI / static file serving behavior.

Version

16.1.0

Logfile

empty

Expected Behavior

No response

Screenshots

No response

Additional Context

No response