バグ #466
みぞ @mizo0203 さんが5年以上前に更新
下記が必要
`android:usesCleartextTraffic="true"`
https://stackoverflow.com/questions/45940861/android-8-cleartext-http-traffic-not-permitted
https://developer.android.com/training/articles/security-config#CleartextTrafficPermitted