allow the origin “localhost:8080” in server. That is the host and the port when running on the device.
If you can not change the server, use cordova http plugin. That should bypass CORS.
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I had the same problem and I solved by installing the cordova-plugin-whitelist plugin and configure it in the config.xml file
https://cordova.apache.org/docs/en/latest/reference/cordova-plugin-whitelist/
I had same issue and I was using http://url.com then I changed my url to https://url.com and problem solved