Mattermost client for Android reports User-Agent as okhttp/4.12.0

[duncan-bayne]

Summary

Mattermost client for Android reports User-Agent as okhttp/4.12.0, not a Mattermost-specific user agent like the iOS and Desktop clients.

Steps to reproduce

1. Set up a https://mitmproxy.org/ proxy to log HTTP queries.
2. Configure Android device to use the proxy and CA certs created in step 1.
3. Open the Android Mattermost app.
4. Tap the Servers icon.
5. Tap the Add a server button.
6. Enter the server URL.
7. Enter a display name.
8. Click Connect.

Server versions

Mattermost Version: 9.4.2
Database Schema Version: 117
Build Number: 7586560796
Database: postgres

Client versions

Android 2.12.2
Google Pixel 4
Android 13 (LineageOS 20)

Expected behavior

At step 8, I'd expect to see HTTP requests with a User-Agent header containing some variant of the string "Mattermost". This is how the iOS app behaves.

Observed behavior (that appears unintentional)

I see HTTP requests with a User-Agent header containing "okhttp/4.12.0".