What is CORS

CORS (Cross-Origin Resource Sharing) is a security feature implemented in web browsers that allows or restricts resources from being requested across different domains. It is a mechanism that uses HTTP headers to tell the browser whether it can share resources with a different origin.

These security measures are important to prevent potential cross-origin attacks, which could compromise user data or lead to other vulnerabilities. CORS allows developers to specify which domains can access their resources, providing a way to relax the same-origin policy implemented by browsers.

For example, if your web application is served from https://example.com and it attempts to fetch resources from https://api.example.com, the server at api.example.com must explicitly allow this request by including the appropriate CORS headers in its response.


CORS Cross-Origin Resource Sharing web security HTTP headers same-origin policy browser security

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