CORS

Understanding CORS (Cross-Origin Resource Sharing)

What is CORS? Cross-Origin Resource Sharing (CORS) is a security feature implemented by web browsers to control how resources on a web page can be requested from another domain (origin). It ensures that only authorized websites can interact with specific resources.

Why is it Necessary? Without CORS, malicious websites could exploit resources from another domain, leading to security vulnerabilities such as data leaks or unauthorized access. CORS defines rules for secure cross-origin requests, safeguarding data integrity.

How It Works: When a web page sends a request to a different origin (e.g., API calls or external scripts), the server checks for specific HTTP headers, such as `Access-Control-Allow-Origin`, to decide whether the request should be allowed.

CORS helps maintain a balance between functionality and security, making it a critical component of modern web development.