What is CORS configuration and why is it important?

What is CORS configuration 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 do I configure CORS in my web application?

To configure CORS, you typically need to set the appropriate headers in your server's response. For example, in a Node.js application, you can use the 'cors' middleware to easily manage these headers.

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 control which domains can access your resources and what methods they can use.

Can CORS configuration affect my API's performance?

Yes, improper CORS configuration can lead to performance issues, such as increased latency due to preflight requests. It's important to configure it correctly to minimize overhead.