Ionic 4 HttpClient get not working after creating app on android 9.0

its work fine in local. After creating app its not working on android 9.0 but work on older versions.

import { HttpClient , HttpHeaders } from ‘@angular/common/http’;
import { Storage } from ‘@ionic/storage’;

this.http.get(this.url + “/” + type + “?username=”+username + “&password=”+password ).subscribe(data => {

  if(data['userData'] != undefined){

    if(data['userData']['username'] != undefined){

        this.storage.set(TOKEN_KEY, data['userData']['username']).then(() => {

        this.currentUser = data['userData']['username'];
        Userid = data['userData']['id'];

        this.router.navigate(['/list-page']);
        return true;           
      });
    }
    else if(data['error']){
      alert(data['error']['text']);
      return false;
    }else{
      console.log(data);
      alert('Correct Password or username.');
      return false;
    }
  }
  else if(data['error']){
    alert(data['error']['text']);
    return false;
  }else{
    console.log(data);
    alert('Correct Password or username.');
    return false;
  }

remove web view plugin