title: Anderstand how to initialize the keycloak-angular service ? (bearerExcludedUrls, etc...)
body: <p>I'm using Angular 8.0.3, keycloak 8.0.0 and the <a href="https://www.npmjs.com/package/keycloak-angular" rel="noreferrer">keycloak-service</a> 7.0.1</p>
  
  <p><strong>Problem</strong></p>
  
  <p>I managed to configure the authentication from my angular app. So every time that I go on my application without authorization header, I'm being redirected towards the keycloak login page. </p>
  
  <p>If I want an unlogged person to access a public page (e. g.'/public/cities') without redirecting to the keycloak login page, should I use'bearerExcludedUrIs'? If so, what should I wear? If not, how to proceed?</p>
  
  <p>from a more general point of view, the keycloak initialization function in the service provided has an initOption part. I don't exactly understand the meaning of all its attributes (onLoad, token, refreshToken, idToken, timeSkew, sheckLoginIframe, checkLoginIframeInterval, responseMode, flow). If an enlightened person willing to share his knowledge with me could enlighten me, I would be grateful...</p>
  
  <p><strong>My code</strong></p>
  
  <p>I'm using ngDoBootstrap to bootstrap the library and configure keycloak-angular. In this example, I tried to allow all the urls with the regex /.*/ (but nothing change).</p>
  
  <pre><code>
  const keycloakService = new KeycloakService();
  
  @NgModule({
    declarations: [
      AppComponent,
      HeaderComponent,
      LoginComponent
    ],
    imports: [
      KeycloakAngularModule,
      BrowserModule,
      AppRoutingModule,
      CoreModule,
      SharedModule,
      PagesModule
    ],
    providers: [
      {
        provide: KeycloakService,
        useValue: keycloakService,
      }
    ],
    entryComponents: [AppComponent]
  })
  export class AppModule implements DoBootstrap {
    async ngDoBootstrap(app) {
      const { keycloakConfig } = environment;
  
      try {
        keycloakService.init({
          config: keycloakConfig,
          initOptions: {
            onLoad: 'login-required',
            checkLoginIframe: false
          },
          enableBearerInterceptor: true,
          bearerExcludedUrls: ['.*']
        }).then(() =&gt; {
          app.bootstrap(AppComponent);
        });
      } catch (error) {
        console.error('Keycloak init failed', error);
      }
    }
  }
  </code></pre>
  
  <p><br>
  <strong>below, several links I have already visited</strong></p>
  
  <p><a href="https://github.com/mauriciovigolo/keycloak-angular/tree/master/examples/webapp" rel="noreferrer">keycloak-angular github examples</a><br>
  <a href="https://github.com/mauriciovigolo/keycloak-angular/issues/11" rel="noreferrer">A topic that raises a similar error with version 4.0.0 of the keycloak-service</a></p>