LibreTube/app/src/main/res/xml/network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config xmlns:tools="http://schemas.android.com/tools">
    <!-- Allow clear text traffic -->
    <base-config
        cleartextTrafficPermitted="true"
        tools:ignore="InsecureBaseConfiguration">
        <trust-anchors>
            <!-- Trust preinstalled CAs -->
            <certificates src="system" />
            <!-- Additionally trust user added CAs -->
            <certificates src="user"
                tools:ignore="AcceptsUserCertificates" />
        </trust-anchors>
    </base-config>
</network-security-config>