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" />


<widget id="io.ionic.starter" version="1.0.1" xmlns="" xmlns:android="" xmlns:cdv="">

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.