ERR_CLEARTEXT_NOT_PERMITTED while opening an external link

I have an Ionic4 app with some banners, when I click on a banner, a site should open in the browser of the mobile.
The URLs are opened with the command:;

The problem is that not all the sites have the https version, so on Android 9 when I click the banner I have the error:

I have already done these modifications on the config.xml file:

<widget id="..." version="01.00.48" xmlns="" xmlns:android="" xmlns:cdv="">

    <platform name="android">
        <edit-config file="app/src/main/AndroidManifest.xml" mode="merge" target="/manifest/application">
            <application android:usesCleartextTraffic="true" />
        <allow-navigation href="*" />

But the problem persists.
How can I open an external Http link on android?

Claudio Battaglino

It seams that opening on Android the link in this way:
this.iab.create(banner, '_system');

it works.
However with the previous configuration of the config.xml file.