Access to fetch at 'http://127.0.0.1:8080/tweet.json' from origin 'http://localhost:3000' has been blocked by CORS policy code example

Example: 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' });