Ionic project works good in browser but no display in emulator

hi friends. this is my second project using ionic 2.
im fetching data from other website with restful services/api
it really works fine in browser mode. but when i emulate it in both android/ios.
api don’t seem to get data.
any advice,suggestion
please help me.

Did you remote debug the problem on the device already?
Follow these instructions here to debug the problem in Safari dev tools:
https://ionic.zone/debug/remote-debug-your-app#ios
Follow these instructions here to debug the problem in Chrome dev tools:
https://ionic.zone/debug/remote-debug-your-app#android
Look at the console and network tabs for errors.