Sorry pal, I recently look your answer. I am not on my computer now.
I am working in ionic and I am using Cordova http installed on capacitor. I know that it is used for web browsers but it is supposed that works with the right strapi cors configuration.
The other way is hardest one. I will have to reprogram all my code making two services. One for browser and other for devices using advanced-native-http and use condition to select one or the other depending on platform.
Or, to use only native-advanced-http and ionic proxy.
Both ways are hard. I have working we promises and I will have to refactor all my code in order to use observables.