Failed to load "url" Response for preflight does not have HTTP ok status

Ionic Framework ionic-v3
1

Hello,

i have this provider to load data from a url

export class FortniteProvider {

  url: string ="https:/example/v1/profile/";
  key: string = "Key: b4776120-e427-4e22-b16d-77090958e957";

  

  constructor(private http: HttpClient) {
    console.log('Hello FortniteProvider Provider');
  }

 getUserData(username: string, platform: string){
    console.log("getUserData loaded //com by me");

    return this.http.get(`${this.url}${platform}/${username}`, {headers: {API_KEY}});
  }

this is the error:

fuck
fuck.png1222×268 35.4 KB

there are my “app.module.ts”

import { BrowserModule } from '@angular/platform-browser';
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';
import { SplashScreen } from '@ionic-native/splash-screen';
import { StatusBar } from '@ionic-native/status-bar';

import { MyApp } from './app.component';
import { FortniteProvider } from '../providers/fortnite/fortnite';
import { HttpClientModule } from '@angular/common/http';


@NgModule({
  declarations: [
    MyApp,
  
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    IonicModule.forRoot(MyApp)
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler},
    FortniteProvider
  ]
})
export class AppModule {}

and my ionic.config.json

{
  "name": "FortniteStats",
  "type": "ionic-angular",
  "integrations": {
    "cordova": {}
  }
  
  
}

why isn’t it working?