Fetch: Cross-Origin Requests

If we send a fetch request to another web-site, it will probably fail. For instance, let’s try fetching http://example.com: Fetch fails, as expected. The core concept here is origin – a domain/port/protocol triplet. Cross-origin requests – those sent to another domain (even a subdomain) or protocol or port – require special headers from the remote side. That policy is called “CORS”: Cross-Origin R