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kotlinlang

<https://developer.android.com/training/articles/security-config|https://developer.android.com/training/articles/security-config>
<https://android-developers.googleblog.com/2016/07/changes-to-trusted-certificate.html|https://android-developers.googleblog.com/2016/07/changes-to-trusted-certificate.html>

this is Android specific, and not related to Kotlin. on newer versions, Android OS will not allow insecure communication unless you specifically opt into it