CORS: the ultimate guide
CORS (Cross-Origin Resource Sharing) is a security mechanism that protects users' data from being accessed by malicious websites when different origins interact. AJAX (Asynchronous JavaScript And XML) requests from web browsers are controlled by CORS rules, ensuring data confidentiality and security. This guide explains how CORS policies are configured via HTTP response headers to allow or deny access based on origin and credentials. It also highlights the dangers of misconfigured CORS policies and provides steps to define a secure CORS policy effectively.