access to fetch at from origin has been blocked by cors policy code example

Example 1: Access to fetch at 'https://api.myip.com/' from origin 'http://localhost:8000' has been blocked by CORS policy: No 'Access-

fetch('http://localhost:8080/posts', { mode: 'no-cors' });

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

'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 key',

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