What is CORS?
CORS is an HTTP header system controlling whether browser code may read a response from another origin.
Cross-origin permission
The browser sends Origin and the server replies with Access-Control-Allow-Origin when appropriate. Some requests require an OPTIONS preflight; methods and headers are controlled separately.
Uses and limitations
CORS is not authentication or a server firewall; non-browser clients may still send requests. Wildcard origins cannot be combined with credentialed browser access.
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