http request fails in ionic android 8+

my ionic 4 HTTP request is not working fine in android 9, but in android < 9 it working perfectly. after debug the app it shows fail status in the network tab. I have added.

<edit-config file="app/src/main/AndroidManifest.xml" mode="merge" target="/manifest/application">
            <application android:networkSecurityConfig="@xml/network_security_config" />
            <application android:usesCleartextTraffic="true" />
</edit-config>

and

<widget id="io.ionic.starter" version="1.0.1" xmlns="http://www.w3.org/ns/widgets" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cdv="http://cordova.apache.org/ns/1.0">

in config.xml file and change the android:targetSdkVersion

<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="29" />

in AndroidManifest.xml file. but these are also not useable .please help me out in this.