Android: How to enable or disable cleartext traffic (plain http:// URLs)?

3D WebView for Android is powered by the Android System WebView, which blocks http:// (non-https) URLs by default. If an application tries to load a plain http:// URL into an Android System WebView, its default behavior is that it will display a net::ERR_CLEARTEXT_NOT_PERMITTED error message. To enable plain http:// URLs, 3D WebView's AndroidBuildScript.cs script automatically adds the attribute android:usesCleartextTraffic="true" to the application's manifest, which allows non-https URLs to be loaded. If you wish to disable that functionality and return to the default behavior of blocking http:// URLs, you can do so by adding the scripting symbol VUPLEX_ANDROID_DISABLE_CLEARTEXT_TRAFFIC in Player Settings.