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Insert the following two lines into AndroidManifest.xml
1. <uses-permission android:name="android.permission.INTERNET"/>
2. android:usesCleartextTraffic="true"
References:
1. Android9.0 WebView遇到net::ERR_CLEARTEXT_NOT_PERMITTED的錯誤
2. Android WebView fix ERR_CACHE_MISS
error solution
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