Http failure response for (unknown url): 0 Unknown Error on android

I have an ionic app when I run that on ios then it works perfectly fine but when I run that then I get above error which is

Http failure response for (unknown url): 0 Unknown Error

Any reason I am getting this one? I have allowed CORS on server side as it is working on iOS devices.

Any help?

EDIT

This is what I have in my app.js file

const cors = require('cors');

And then I simply use it with default options.

app.use(cors());

from Http failure response for (unknown url): 0 Unknown Error on android