What is CORS and why is it important?

What is CORS and why is it important?

CORS stands for Cross-Origin Resource Sharing. It's a security feature that allows or restricts resources on a web page to be requested from another domain outside the domain from which the first resource was served.

How does CORS work in practice?

When a web application makes a request to a different domain, the browser sends an HTTP request with an 'Origin' header. The server can then respond with specific headers to allow or deny the request.

What are the common CORS headers I should know about?

The most common CORS headers include 'Access-Control-Allow-Origin', 'Access-Control-Allow-Methods', and 'Access-Control-Allow-Headers'. These headers define which origins are permitted to access the resources.

What happens if CORS is not configured properly?

If CORS is not configured properly, browsers will block requests from different origins, leading to errors and preventing your web application from functioning as intended.