cors

Cross-Origin Resource Sharing (CORS) is a browser security feature that restricts web pages from making requests to a different domain than the one which served the web page. This prevents malicious websites from accessing sensitive data from other sites. When a web page makes a request to a different origin (domain, protocol, or port), the browser initiates a CORS check. The server of the other origin must include specific HTTP headers in its response to indicate that the cross-origin request is allowed. These headers specify which origins are permitted to access the resource. If the server does not include the appropriate CORS headers, the browser blocks the request, preventing the web page from accessing the data. CORS is essential for protecting user data and ensuring the security of web applications.