# Cleartext HTTP traffic not permitted (Firebase Local Emulator + Android Emulator)

When signing in with Firebase Auth using the Local Emulator on Android, the following error appears:

```
I/flutter (24830): [firebase_auth/unknown] com.google.firebase.FirebaseException: An internal error has occurred. [ Cleartext HTTP traffic to 10.0.2.2 not permitted ], #0      StandardMethodCodec.decodeEnvelope
```

The solution is found in [this highly upvoted question](https://stackoverflow.com/questions/45940861/android-8-cleartext-http-traffic-not-permitted) on StackOverflow. And I've verified that option 2 in [this answer](https://stackoverflow.com/a/50834600/436422) works as intended.

That is - first create the `android/app/src/main/res/xml/network_security_config.xml` file with these contents:

```xml
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="true">
        <domain includeSubdomains="true">10.0.2.2</domain>
    </domain-config>
</network-security-config>
```

Then, add the `android:networkSecurityConfig` value to the `android/app/src/main/AndroidManifest.xml` file:

```xml
<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
    <application
        ...
        android:networkSecurityConfig="@xml/network_security_config"
        ...>
        ...
    </application>
</manifest>
```

### Resources

- [Android 8: Cleartext HTTP traffic not permitted](https://stackoverflow.com/questions/45940861/android-8-cleartext-http-traffic-not-permitted)
- [How to fix 'Cleartext HTTP traffic to x not permitted'](https://stackoverflow.com/questions/58022495/how-to-fix-cleartext-http-traffic-to-x-not-permitted)