Steps to reproduce:
 1. Set up environment with HTTP proxy (e.g., corporate proxy)
 2. Configure proxy environment variables: HTTP_PROXY=http://proxy.example.com:8080 and HTTPS_PROXY=http://proxy.example.com:8080
 3. Enable proxy auto-config in services-config.json: \{"enableProxyAutoconfig": true}
 4. Open Hub
 5. Attempt to install Unity Editor or Android Build Support module

Expected result: Download succeeds
Actual result: Download fails

Reproducible with: 3.16.2
Not reproducible with: 3.14.5

Reproducible on: Windows 11