Fetch problem Ionic 4

hi, when i try make a fetch in browser this work ok but i try use fetch in android ( ionic compiled version ) this nor work, i see the logs and android studio return this =>

2019-09-06 13:00:13.913 19603-19603/com.fusocoapp.com E/Capacitor/Console: File: http://localhost/CreateAccount - Line 0 - Msg: Uncaught (in promise) TypeError: Failed to fetch

i installed background-fetch of cordova compatible with capcitor but not work

√ Copying web assets from build to android\app\src\main\assets\public in 12.56s
√ Copying native bridge in 18.00ms
√ Copying capacitor.config.json in 3.55ms
  Found 1 Cordova plugin for android
    cordova-plugin-background-fetch (5.6.0)
√ copy in 13.90s
√ Updating Android plugins in 14.93ms
  Found 0 Capacitor plugins for android:
  Found 1 Cordova plugin for android
    cordova-plugin-background-fetch (5.6.0)
√ update android in 451.85ms
√ copy in 882.60μp
√ update web in 40.30μp
Sync finished in 14.475s

this is mi info :frowning:

Ionic:

   Ionic CLI       : 5.2.4 (C:\Users\veerne\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework : @ionic/react 4.8.0-rc.1

Capacitor:

   Capacitor CLI   : 1.2.0
   @capacitor/core : 1.1.1

Utility:

   cordova-res : 0.6.0
   native-run  : 0.2.8

System:

   NodeJS : v12.7.0 (C:\Program Files\nodejs\node.exe)
   npm    : 6.10.0
   OS     : Windows 10

PD: I use capacitor because my project is building in Ionic + React