The SDK appears to attempt connections to 127.0.0.1 instead of the Amplitude endpoint (api2.amplitude.com).

[Arjun-Ingole]

Expected Behavior

The Amplitude Flutter SDK should connect to the correct API endpoint (https://api2.amplitude.com) and upload events without errors.

Current Behavior

The SDK attempts to connect to 127.0.0.1:443, resulting in a java.net.ConnectException. This prevents events from being uploaded successfully.

E/Amplitude(12759): Error when uploading event: Failed to connect to api2.amplitude.com/127.0.0.1:443 E/Amplitude(12759): Stack trace: java.net.ConnectException: Failed to connect to api2.amplitude.com/127.0.0.1:443

Possible Solution

Steps to Reproduce

1. Set up the Amplitude Flutter SDK using the following configuration:

_amplitude = Amplitude(
  Configuration(
    apiKey: '<valid_api_key>',
  ),
);

2. Initialize the Amplitude service and attempt to track an event.
3. Observe the connection error in logs.
4. No events appear in the Amplitude dashboard.

Environment

• SDK Version: 4.0.0.5 Beta
• Flutter Version: 3.24.5
• Device: Google Pixel 6 Pro
• Device OS and Version: Android 12