On this page
PRECONNECT_CHECK_BLOCKLIST
const  developer preview 
Multi-provider injection token to configure which origins should be excluded from the preconnect checks. It can either be a single string or an array of strings to represent a group of origins, for example:
const PRECONNECT_CHECK_BLOCKLIST: InjectionToken<(string | string[])[]>;
   Description
{provide: PRECONNECT_CHECK_BLOCKLIST, multi: true, useValue: 'https://your-domain.com'}
   or:
{provide: PRECONNECT_CHECK_BLOCKLIST, multi: true,
  useValue: ['https://your-domain-1.com', 'https://your-domain-2.com']}
  © 2010–2023 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
 https://v14.angular.io/api/common/PRECONNECT_CHECK_BLOCKLIST