Finally I found out how to access not secured local ressources (HTTP instead of HTTPS) on Android > 8
The difficulty for me was to find where I had to create the network_security_config.xml file, it must be in the …myProject\AndroidResources\res\xml folder
With that simple content :
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true" />
</network-security-config>
And that’s it. Hope that can help someone else
Rod