Advice on meta content-Security-Policy with whitelist plugin

Hi

I am using those plugins, among others, for my ionic app:

cordova-plugin-whitelist
cordova-plugin-googleplus
cordova-plugin-x-socialsharing
phonegap-facebook-plugin

can you please advice me on what to put in the <meta http-equiv="Content-Security-Policy" ... so that the facebook and google plugins work well, and so I can read files from a server and those kind of things ?
Something that I can work with easily while debugging…

Thanks a lot