Fetch file:///, not working URLs

[cih997]

Hi.

I'm trying to get this project working on Android. Unfortunately I got stuck on login screen of Polymer module on Android. When logging in, I always get Login failed due to error:

Fetch API cannot load file:///***. URL scheme "file" is not supported.

What I've tried so far:

https://gist.github.com/joshua-gould/58e1b114a67127273eef239ec0af8989
JakeChampion/fetch#92 (comment)
https://github.com/aporat/cordova-plugin-fetch

But none worked.

Should this work at all? Any ideas much appreciated.