If you include credentials ( fetch(url, credentials: 'include' ) ), Chrome requires:
Extensions have more relaxed CORS rules if they request host_permissions in manifest.json. cors chrome
At its core, CORS is a browser-side security feature that extends the Same-Origin Policy (SOP). The SOP is a strict rule that prevents a web page from making requests to a different domain than the one that served it. For example, a script running on domain-a.com cannot normally access data from api-b.com . For example, a script running on domain-a
) .then(response => response.json()) .then(data => console.log(data)) .catch(error => console.error(error)); response.json()) .then(data =>
When a web page makes a cross-origin request, Chrome sends an OPTIONS request (also known as a preflight request) to the server to determine if the request is allowed. If the server responds with the correct headers, Chrome allows the request to proceed.