Fixing 'Cross-Origin Request Blocked' Error in Web Development

The 'Cross-Origin Request Blocked' error occurs when a web application attempts to make a request to a different origin (domain, protocol, or port) than its own, and the target server does not allow it.

This is a security feature enforced by browsers through the Same-Origin Policy to prevent malicious cross-site attacks.

To resolve this, the target server must explicitly permit cross-origin requests by including appropriate CORS (Cross-Origin Resource Sharing) headers in its response.

For example, in a Node.js application using Express, add middleware like cors to configure headers: app.use(cors({ origin: 'http://yourdomain.com' }));.

Alternatively, you can customize headers manually by setting Access-Control-Allow-Origin and related headers.

While debugging, you might temporarily disable browser security features or use proxy servers to bypass CORS restrictions, but these are not recommended for production.

Instead, configure the backend server and ensure that all requests are authenticated and authorized.

Addressing CORS issues properly ensures secure, seamless communication between the frontend and backend, enhancing the user experience without compromising security.