Change keycloakUrl by removig host part

src/environments/environment.prod.ts

 export const environment = {
   production: true,
-  keycloakURL: 'https://kube-master-h1.informatik.fh-nuernberg.de:/auth/'
+  //keycloakURL: 'https://kube-master-h1.informatik.fh-nuernberg.de:/auth/',
+  keycloakURL: '/auth/',
+  apiURL: 'http://localhost:8080/api'
 };