'file://' has been blocked by CORS policy code example

Example 1: php has been blocked by CORS policy

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: GET,HEAD,OPTIONS,POST,PUT");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, Authorization");

Example 2: origin 'http://localhost:4200' has been blocked by CORS policy

let headers = new HttpHeaders({
      'Content-Type': 'application/json',
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Headers': 'Content-Type',
      'Access-Control-Allow-Methods': 'GET,POST,OPTIONS,DELETE,PUT',
      'Authorization': 'Bearer szdp79a2kz4wh4frjzuqu4sz6qeth8m3',
    });

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Misc Example