Error response external api

Good evening, im developing an app with an external API. In web, ionic dev app and npx cap serve, all works fine, but when i try to package the app with capacitor and deploy in android studio, i have this error with all requests: Login Error: {"headers":{"normalizedNames":{},"lazyUpdate":null,"headers":{}},"status":0,"statusText":"Unknown Error","url":null,"ok":false,"name":"HttpErrorResponse","message":"Http failure response for (unknown url): 0 Unknown Error","error":{"isTrusted":true}}

Does anyone know why?

Regards.

[Raerten]

You can set usesCleartextTraffic="true" only for debug build like this AndroidManifest.xml

...
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="${usesCleartextTraffic}
        >
...

build.gradle

...
android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "app.test"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        manifestPlaceholders = [usesCleartextTraffic:false]
    }
    buildTypes {
        debug {
            applicationIdSuffix ".dev"
            versionNameSuffix "-dev"
            manifestPlaceholders = [usesCleartextTraffic:true]
        }
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
...

[chriswep]

Why don’t you just use http in development or use a good certificate even for development?

because by default the current android version blocks access to http. however as i now learned this can be disabled via android:usesCleartextTraffic="true", which i did now.