Rails and Cordova together - No Content-Security-Policy meta tag found

@claudiocarmeli wrote:

I have been stuck for over a week on something really annoying to which I am sure there must be an easy solution to but I don't really know what to google for and cannot find the answers anywhere.

I have a simple Rails back-end serving JSON to an Ionic+Cordova+Angular front-end. The app works PERFECTLY on browsers. When I try it on the Galaxy5 also does. However, all PUT requests do send a message to the database but don't write anything! It's a security issue as I keep getting

No Content-Security-Policy meta tag found
However adding it does not fix it. Does anyone know WHY? I really need to fix this but have tried all things with no luck so far.

My config.xml looks like this

<meta http-equiv="Content-Security-Policy" content="
default-src *;
style-src * 'unsafe-inline';
script-src * 'unsafe-inline';
media-src *;
img-src * data:;"
/>
And I still get the same

"No Content-Security-Policy meta tag found. Please add one when using the cordova-plugin-whitelist plugin.", source: file:///android_asset/www/plugins/cordova-plugin-whitelist/whitelist.js (26)
I also tried to add that to my index.html but that didn't help. I know for a fact that other people are having the same issue and I am wondering if there is a simple solution to this so that I can go on with my experiments

Thank you very much in advance and sorry for being long,
Kind regards,
Claudio

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